Dec. 31, 1946., ' E. L, wlEGAND 2,413,479 ' CONVEYING OF MATERIALS Original Filed Dec. 7, 1939 6 Sheets-Sheet 1 I z Edwin LW'mganqi ' Asr To RN LYS Dec. 31, 1946. ' E. L. WIEGAND 2,413,479 CONVEYING OF MATERIALS Original Filed Dec.‘ 7, 1939 6 Sheets-Sheet 2 am Compressor Y'Lg. 5. kE 15! , £<1wmLWmqam INVLNTO BY/zmW/MMWJM ' AI TORN EYS Dec. 31, 1946-. E; L, W’IEGAND ' - CONVEYING 0}?‘ MATERIALS Original Filed Dec. 7, 1939 m , 157%???‘ _ 2,413,479 ‘I w 75 6 Sheets-Sheet 3 Dec. 31, 1946. 2,413,479 E. L. WIE'GAND CONVEYING OF MATERIALS Original Filed Dec‘. 7, 1939 6 Sheets-Sheet 4 compagsa' » _" BLowoFF § § m Edwin L.Wuzgand Exam,“ INve 1 Dec. 31, 1946. E. L. WIEGAND 2,413,479 CONVEYING OF MATERIALS ~ Original Filed Dec. 7, 1939 6 Sheets-Sheet 5 w 512 1/0 i<<<<aaem<<<waaaaa\w 51%? 351/ / Pug ii. 117/ if” a! II!“ 1w _Av.‘ 505 6“ % . s?‘i Il % \ .\ , 30! / "‘-E\\\\‘ §/ / 7 z I y | ' £1 \ LdWiLLLJ/V ‘mgancl INvENToK WWW/14M, ATTORNEYS - ' Dec. 31, 1946. 2,413,479 . EL. WIEGAND CONVEYING OF MATERIALS Original Filed Dec. '7, 1939 5~r/ , 6 Sheets-Sheet 6 L .Wiagond IN v 1-: NTO K Mm?! ATToKuFJ/s 2,413,479 Patented Dec. 31, 1946 UNITED STATES PATENT OFFICE 2",41s,47§ CONVEYING OF MATERIALS Edwin L. Wiegand, Pittsburgh,v Pa., assignor to Orefraction Incorporated, Pittsburgh, Pa., a corporation of Pennsylvania Original application December 7, 1939, Serial No. ‘ 308,002. Divided and this application August 28, 1944, Serial No. 551,561 7 Claims. (Cl. 302-53) 1 2 illustrated comprises a container 55 adapted to contain material to be ground, and hereafter re 308,002, ?led December 7, 1939, now Patent 2,375, ferred to as the new-materials container. The 057, and relates particularly to conveying of ma new-materials container 50 may be formed with terial, including by ?uid pressure, and the prin an outlet spout 5| discharging into a funnel 52 cipal object of the present invention is the im carried by the receiving end 53 of an elevating provement of apparatus for that purpose. device 54, such as the bucket elevator here shown. In the drawings accompanying this speci?ca A suitable slide valve 55 is interposed in the out tion and forming a part of this application, there let spout 5! to regulate the ?ow of material from is shown, for purposes of illustration, one embodi ment of apparatus embodying the invention, and 10 the new-materials container 50 to the receiving end 53 of the elevator 54. The elevator 54 may in these drawings: be driven by means of an electric motor 55, and Figure 1 is a more or less diagrammatic view may also have a signal device, such as the electric of the relation between material conveying means, light 57, to indicate when the elevator 54 is op grinding means, and separating means, as these means may be utilized in one embodiment of my 15 erating. The discharge end 58 of the elevator 54 discharges into a conduit 59 leading to a blend~ invention, ing and metering hopper 50, desirably provided Figure 2 is a sectional view of a material hopper with an inclined false bottom Ella, and having and control device, high and low limit ‘controls 6! and 62, so as to Figure 3 is a more or less diagrammatic view, particularly showing the ?uid connections be 20 control operation of the motor 56 of the elevator 54, the connections being such that the motor 55 tween parts of the apparatus, of the elevator 54 is automatically started when Figure 4 is an enlarged sectional view of the the level of the material falls below the low level solids metering and hoist tank, parts being shown device 62, and the motor 55 is automatically in elevation, and parts being broken away, this View showing a solids inlet valve for the tank in 25 stopped when the material rises up to the high level device 6 I. open position, Preferably, the high level control 6| comprises Figure 5 is a fragmentary detail view showing a rotatable housing disposed at the outside of the the solids inlet valve in closed position, hopper, the housing containing a mercury switch Figure 6 is a section taken on the line 6—6 of Figure 5, looking in the direction of the arrows, 30 which is electrically connected to the motor 55, the housing being rotatable in one direction by Figure 7 is an elevational view showing the re a vane Bla within the hopper 5!! (see Figure 2). lationship between an air strainer tank and upper The low level device 52 comprises a pivoted vane and lower material feed tanks, and showing also 62a, within the hopper 60, urged counterclock valves in the connections in a certain position, Figure 8 is a'view similar to Figure 7, omitting 35 wise, as viewed in Figure 2, by a counterweight 62b. The vanes 5 la and 62a are shown in Figure the air strainer tank and certain other parts, and 2 in the position they occupy when the hopper 50 showing the valves in full lines in a di?erent po is full of material, as indicated by the upper dot sition, and in dotted lines in still another posi ted mount line M, the vane Eta standing about tion, and including the means for actuating the 45° counterclockwise to the right of the vertical 40 valves, and the vane 62a about 45° clockwise to the left Figure 9 is a section taken on the line 9-9 of of the vertical. The vanes 6 la and 62a are shown Figure 8, as connected by a lost motion connection which Figure 10 is an enlarged fragmentary sectional includes a rod 620 disposed at the outside of the view through the upper and lower material feed 45 hopper 60, pivoted at its lower end to a crank 62d tanks, movable in unison with the vane 62a, and having Figure 11 is an enlarged sectional view through at its upper end a slot with which cooperates a one of the valves shown in Figure 10, pin on a crank 62c movable in unison with the Figure 12 is a sectional view corresponding gen This application is a division of my application vane 6 la. ‘ erally to the line [2-42 of Figure 11, parts being Withdrawal of the material from the hopper 65 50 shown in elevation, and causes the surface of the mound of material to Figure 13 is an electrical diagram, showing the fall, but for the time being the vane Bia, by fric electrical connections between parts comprised in tion adjustment of its shaft, remains in the po the apparatus. sition shown in Figure 2, even though the surface Referring to the schematic arrangement shown in Figure l, the embodiment of the invention there 55 of ‘the mound adjacent the vane ?la recedes away 2,413,479 4 3 from that vane. When the mound of material decreases in height so that its surface adjacent the vane 62a recedes sufficiently away from that vane, the counterweight 82b causes counterclock wise rotation of the vane to a position about 45° counterclockwise to the right of the vertical, such movement being transmitted through the lost mo conduit 82 to permit transfer of material from the upper tank 19 to the lower tank 8!, and to enable the lower tank to be maintained under pressure. The lower tank 8! has an outlet con duit 86, a valve 85 being interposed in the outlet conduit iii for permitting or interrupting the outflow of material from the lower tank 8!. tion connection so as to move the vane 6 la clock Means, shown in Figure 3, is provided for admit wise to a position about 45° to the left of the ting air under pressure to the upper and lower vertical, thus moving the mercury switch to 'its' 10 tanks 19 and Bi, as will more fully appear. “on” position, in which position it completes the Assuming that the valve 83 is closed and the circuit through the motor 55, whereby material valve 85 is open, and assuming also that material is delivered to the hopper Si! by the elevator 56. is in the lower tank 8 l, and that this tank is under When the mound of material in the hopper in air pressure, the material from the tank 8! will creases, either by reason of delivery by the ele be forced through the outlet conduit 8-4, and vator 54 or otherwise, as will appear hereinafter, through a hose conduit 86 to the breech 8‘! of the material acts against the vane 62a and even a gun 88, and through this gun 88 to the grinder tually moves the vane 62a clockwise, into the posi case 89, the ground material passing through a tion shown in Figure 2, against the urging action conduit 98 to a ?rst separating device 9! of the of the counterweight, ‘when the mound reaches cyclone type, The heavier material in the ?rst the height indicated by the lower dotted mound ‘separating device 9i may gravitate past a check line m. However, such movement of the vane 62a valve 92 used to build up a “head” of material will not affect the vane Ella because of the lost at the discharge end of the ?rst separating tank motion connection therebetween. When the 9!, through a conduit 93 to a funnel 94, and from mound of material rises enough, the material 25 ‘the funnel 94 to a screen chamber 95 of a screen will act against the vane .65a and eventually ing device 96. The screening device 95 may be move it counterclockwise to the-position shown in of the vibrating type, having a screen 97 over Figure 2, when the mound has increased to the which the material is shucked, the screen having upper dotted mound line M, thereby causing rota a certain predetermined mesh size, as for ex tion of the mercury switch to its “0 .” position, ample 200 mesh. and thus interrupting the circuit of the motor 58. The material which passes through the screen Positioned alongside of the hopper 60 is a 9'1 falls into a hopper 93, the outlet of the hopper second elevator 63, having its inlet end ‘54 re 93 having a bagging device 99, to which a bag ceiving material from the lower end of the hop I99 is attached, the bag I80 receiving such mate per Ell, as by means of a conduit 85, a suitable rial for shipment if desired. For convenience, the slide valve 66 being so interposed as to control bag 19%] may be disposed on a platform ml of a the amount of material ?owing from the hopper scale Hi2, so that the amount of material deliv 6!}. The elevator 53 is driven by an electric motor ered to the bag Hi0 may be weighed as it is de 61, and may have a signaling device, such as the livered to the bag. That material which does electric light E3, to indicate when the motor 6? is not pass through the screen 9"! is discharged from running. The discharge end 63 of the elevator the screen chamber 85 through a conduit “13, and 63 leads to the inlet of a solids valve ‘Hi the outlet back to the mixing hopper 65]. Additional mate of which communicates with the interior of a rial, from the new materials container 56, may charge metering and hoist tank ll. The hoist be added to the hopper Si! by means of the ele tank ‘H has high and low level devices 12 and 45 vator 513, the high level device GI limiting the 73 respectively, so related to other parts (as will amount of new material delivered to the hopper more fully appear) as normally to cause the B9. In this manner the material removed from motor 6? to operate when the material is below the system is automatically replaced with new the low level device ‘53, and to interrupt the cir material from the new materials container 53. cuit of the motor 6'! when the material reaches The slide valve 55 may be adjusted to a particular the high level device ‘i2. ?ow rate, such rate being determined by'the rate A ?uid under pressure, in the present instance, at which ?nished material is removed from the air, may be admitted to the hoist tank TH through system. > a conduit ‘i4, and such air may be released from Additional separating means ,is provided for ad the hoist tank ‘H through either the conduit ill ditionally separating that material which does or a blow-off conduit ‘l5. With material in the not gravitate from the ?rst separating device 9!, hoist tank 1!, and air under pressure supplied and this means comprises, among other parts, a to the hoist tank l'l through the air conduit 1%, pump, in this instance a blower fan ltd, disposed the material in the hoist tank ‘H is forced to within a fan chamber Iii-5 and driven by an elec move through a conduit 16 to a connection con 60 tric motor I06. The outlet of the fan chamber duit ll" between an air strainer tank "i8 and an #35 is branched, one branch NH leading to the upper material feed tank 19, a valve 89 being atmosphere, and the other branch I88 being con interposed in the connection conduit TI to per nected to one end of a conduit I09, the opposite mit admission of material to the upper tank ‘i5 end ll!) of the conduit I09 leading tangentially and to enable the tank to be placed under ?uid into the ?rst separating device 53!, if desired in pressure. Assuming the valve 80 to be in open two diametrically disposed tangential branches position, the material which passes through the Hlla and Hill). Slide valves H! and H2 are re spectively interposed in the branch conduits l0‘! conduit '16 is delivered to the connection conduit ‘H, the air used for hoisting purposes being and‘lilB, these valves being independently adjust strained by and vented from the strainer tank 70 able so' as to regulate the amount of air dis charged by the blower through the respective 18, and the material dropping into the upper feed tank 19. branch, for a purpose to appear. The upper feed tank ‘is is connected to a lower The ‘upper discharge outlet of the separating feed tank 8| by means of a connection conduit device 9| is connected to the inlet of the blower 82, a valve 83 being interposed in the connection chamber 565, and in this instance certain devices 2,413,479 5 are interposed in this connection. Extending from the upper discharge outlet of the first sep arating device 9| isa separating column, H3, of any suitable cross-sectional form, area, and length, which extends vertically and is connected to a conduit H4 which is tangentially connected to the upper end of a second air separating de vice H6. Desirably the separating column II 3 is enlarged with respect to the conduit H4, and may taper toward its lower end to cause hin dered settling. The device H6 may be of the no back pressure is created in the conduit 98 leading from the grinder case 89. Also,; usually the valves III and I I2 are adjusted to effect sub stantially zero (atmospheric) pressure in the grinder case 89, thereby to avoid back pressure in the grinder case 89 that might interfere with the 120 operation of the grinder gun. However, it will be apparent that the pressure conditions in the grinder case and‘ in the separating system can be regulated by adjustment of the slide valves I i I and I I2 to obtain any desired pressure conditions. Furthermore, the velocity of the upwardly moving cyclone type, comprising a chamber having an stream of air in the separating column H3 may upper cylindrical portion In and a downwardly be adjusted to a most suitable velocity so that the tapering conical portion IIB. A bagging device H9 is connected to the lower end of the conical 15 separating function of the column H3 will be optimum. portion H8, and has attached thereto a bag I29 The ?rst separating device 98 may be moved for receiving material gravitating downwardly from the position shown in full lines in Figure 1 of the conical'portion H8. The upper end of to the position shown in dotted lines, wherein the second separating device H5 is formed with a housing I2I communicating with the interior of 20 its lower end vno longer communicates with the conduit $3, but instead communicates with a con the device H6. The housing I2I communicates duit i35 leading to a tank Hi5, hereinafter re by means of a conduit I22 with a dust collector ferred to as a by-pass tank. The lower end of or separator I23, which may be of any suitable the tank I36 carries a bagging device I 3'6, to which type. The lower end of the dust separator I23 has attached thereto a bagging device I25, and 25 a bag I38 may be attached, and a check valve l?d is interposed in the conduit I35. In this position the air outlet of the dust'separator I23 is con of the device 9| the ground material, excepting nected by’a conduit I25 to the inlet of the fan only a controllable amount and size of very ?ne chamber I85. ' material, instead of going to ‘the screen chamber Assuming that the motor Idiiis operating, and that the valve H I is at least partially open, and 30 95, passes directly to the by-pass tank let. The conduit H3 in this position may still be con that ground material, along with air used in nected to the conduit I M. The by-pass tank con grinding it, is being delivered through the con nection is particularly useful when it is desired duit 98 to the ?rst separating device ill, the ma to make an unscreened ground aggregate, with terial which under the air conditions prevailing in the separating system is not heavy enough to 35 only a minimum of extreme ?nes removed. The ?uid pressure system is particularly shown gravitate at once from the separating device M, in Figure 3, and in this embodiment uses air as will be picked up by the stream of air in the the fluid, although any other suitable ?uid may column H3. Some of this material will continue be used. rThe system comprises an air compressor to be carried by that stream to the top of the I45, a conduit I46 leading from the air com column H3 and through the conduit H4 to the pressor M5 to an air storage tank Hi1, and a upper end of the second separating device H8, threeeway valve M8 interposed in the conduit and will be caused to swirl in this upper end M6, the valve H18 in one position establishing because of the tangential connection of the con communication between the compressor M5 and duit H4. The heavier materials in the second the storage tank M7, and in another position es separating device H6 will gravitate downwardly tablishing communication between the storage through the conical portion H8, and will be de tank I81 and a tank Hi9, hereinafter referred to livered to the bag I28 through the bagging de as the waste air tank, the latter tank having vice H9. The lighter material will be carried safety valves i578 adapted to open at a predeter upwardly by the air stream through the housing mined pressure, as for example 175 to 185 pounds HI and the conduit I22, to the dust collector per square inch. I23, where the dust will be separated from the To start the apparatus initially, the valve “38 air, the dust particles being discharged from the is set to establish communication between the air bottom of the dust separator I23 and to the bag compressor I45 and the storage tank I41, and ging devivce I24, and the air passing to the con any desired pressure is built up in the tank ME’. duit I25 and back to the inlet of the blower cham ~ber I85. Some of the material which enters the The valve M8 is then turned to establish com munication between the storage tank I41 and the separating column H3 from the separating de waste air tank I49, and air is permitted to ?ow vice 9I does not continue with the upwardly mov to the tank hi9 until the predetermined pressure ing stream of air into the conduit Ihl, but gravi tates back through the stream into the separat 60 is built up in the tank I49. The valve I48 is then turned to its'third position, wherein it establishes ing device 9I and ?nally reaches the lower or communication between the waste air tank I 49 discharge end of the separating device 9|, and and a conduit I52, for a purpose hereinafter ex thus the separating action of the system is im plained. A manual control valve I55 may also proved. , be interposed in the conduit I48 for controlling . Depending upon the setting of the slide valves the ?ow of air through the conduit I46, and a I I I and I I2, either an under-pressure or an over pressure indicator I56 may be connected to the pressure condition (With respect to atmospheric ' pressure) can be made to exist in the ?rst sep arating device -9I. - Usually the valve H2 is par tially or completely closed, and the valve I I I par tially or completely open, so that an under-pres sure or partial vacuum exists within the ?rst conduit I46 ahead of the valve I55. Pressure indicators I55 and I56a may be connected to the waste air, tank I49 and to the storage tank It‘; respectively. ‘ ' Leading from, the waste air tank I69 is a .con duit I59, a valve I68 being interposed in this con separating device 91 and in the column H3, duit to permit or interrupt ?ow of air there whereby material readily passes from the grind or case 89 to the ?rst separating device 9i, and 75 through, the valve I58 being actuated by means 2,413,479 7 of a solenoid Hit. ‘conduit I59, the valve i158 (assuming that this The conduit I59 leads to a manually operable valve I62, preferably of the three-way packed plugcock ‘type, one outlet 163 valve is open), the conduits ltdzand 14, to the hoist tank ‘II, and after a predetermined amount of pressure has been built up within the hoist tank ‘H, the material will be forced through the conduit 'IGto the connection conduit 71, and into the upper tank 19. The pressure required to move the material in the hoist tank ‘II depends of the valve E52 leading by means ofaconduit $64 to the inlet conduit ‘id of the hoist tank ‘II, and the other outlet U55 leading by means of the conduit I66 to a dust separator IN. The dust separator I?‘l has an air ‘outlet I68 leadingtc a mu?ler ltd for the purpose of mu?ling the noise of the escaping air, the air pa'ssingfrom the muliler Iiit to the atmosphere. upon the characteristics of the material and the speedwat'which it is desired to move such mate ' The blow-off conduit ‘I5 of the hoist tank ‘H is connected to a conduit I10 through a valve I‘II interposed to permit or interrupt the ?ow of air through the conduits ‘I5 and Ill?, the-valve 1i I‘II being actuated by a solenoid I12. The con duit I‘!!! is connected with the conduit 185, and through the conduit I55 with a conduit H3 'which leads to one outlet I ill of a manually operable valve I35 which may be of the three-way type in all respects similar to the valve I62. Another outlet I'I? of the valve I15 is connected by means while of thethe conduit third outlet iti o I18 theisthree-way connected valve by means of a conduit H9 to the upper tank ‘I9, a check valve I88‘ being interposed in the conduit ‘I79 to rial. 'The air used to move the material to the upper tank ‘I9 is ?ltered by passage through the air strainer tank ‘I8 and escapes therefrom. After all of the material has been hoisted t0 the upper tank ‘I9, the operator may turn the control lever-of the valve I62 from the “air input, hoist” position to the “blow-oil” position, so that the pressure within the tank ‘II may be relieved by air flow through the conduit I 54, the/port I55 of the valve I62, the conduit I66, the dust sepa rator tank I61, the muiii-er I69, and to atmosphere, or the pressure may be relieved otherwise as will appear hereinafter. During operation of the apparatus, air under pressure is delivered directly to the lower tank 8I by means of the conduit I83. Assuming that the material in the lower tank is low, and that permit air to ?ow only outwardly of the upper material already has been hoisted to the upper tank 18 and to prevent reverse flow. tank ‘Iii in'a manner hereinbefore described, and The present embodiment provides a separate air compressor I8! for supplying air under pres 30 that the valves 86, 83, and 85, are closed, the control lever of the three-way valve I95 is turned sure to the upper and lower tanks 79 and 8!, to “compress” position, and in this position of The compressor Isl is connected to a storage tank the valve I95 air from the conduit I52 passes I82 by a suitable conduit as shown. Extending through the valve H95 and through the conduit from the storage tank I82 to the lower tank 8! 28%} to the upper tank “59, and air is thus ad is a conduit 539 in which are interposed a line mitted until the pressure indicator Z?l shows that cock I83, a line gauge I811, a pressure regulator the pressure in the upper tank ‘i9 is substantially i35, a three-way meter by-pa'ss I86, another line equal to that in the lower tank 8!. The control gauge 58?, a stop cock I82, a stop cock It?a to lever of the valve I95 is then moved to “equalize” permit and interrupt the flow of air to the tank position, whereupon the conduit E92 is shut oil”, 8!, and a check valve I9! to permit air to flow and communication between the tanks l9 and only into the lower tank 8! and to prevent re iii isestablished by means of the conduit I91, the verse flow. It will be apparent that the conduit valve. £95, and the conduit 2%, so as to insure I89 furnishes direct, regulated, and controllable that the pressure within the lower tank SI is not pressure to the tank 8i, so that material within greater than that in the upper tank ‘I9. Then the tank 35 will be positively forced out by this the valve 83 is opened to permit the material direct pressure through the conduit 86 and the from the tank ‘I9 to pass to the tank 85. The gun 88. control lever of the valve I95 may then be moved A conduit W2 is tapped into the conduit I89 to “dead” position. between the regulator i823 and the stop cock If desired, air under a pressure higher than IBM, and has a check valve 593 interposed there 50 that within the tanks 79 and Si may be intro in to permit air to pass only from the conduit duced into the upper tank ‘i9 so as to force the I8§ through the conduit E92 and to prevent air material from the tank ‘i9 into the lower tank 8i. from passing from the conduit £92 back to the conduit I89. The conduit N92 is connected to which one port may I913beofofa the manually three-way operable type valve similar to the valves I52 and H5, 3, second port let; of the valve I95 being connected by means of a conduit I 9'5 to the lower tank 85, a pressure indicating device i923 being connected to the conduit I532’. The other port I53 of the valve I95 is connected by means of a conduit 2% to the upper tank ‘is, To provide for such higher pressure air, a three 55 way valve 283 may be interposed in the conduit 2%, one port 253‘! of the valve 2533 being connected to a conduit 2% tapped into the pressure line E39 ' ahead of the pressure regulator I93 to receive a higher pressure than exists in the part of the conduit I89 downstream of the regulator. The other ports 29% and Bill of the valve R23 are in terposed in the conduit 2%. Thus with the valve2%3 inposition to establish communication between the conduit 2% and the part 252% of connected to this conduit 2%. Describing generally the pressure system, it will 65 the conduit 288, and to cut off communication with the part idea of the conduit 206,‘ the air be assumed that material is in the hoist tank ‘II, under higher pressure in the upper tank ‘I9 will but that no material is in the upper and lower surge to the lower tank 8i, and will forcibly re- i feed tanks ‘I9 and ill, and it will also be assumed move any remaining material from the tank ‘is. that the valve 88 in the upper tank is open, and When all the material has been delivered to that the valve 83 between the upper and lower 70 the lower tank at, the valve 83 is moved to closed tanks ‘I9 and Bi , and the valve 85 below the lower position, and the valve 35 "isopenedthus feeding tank 8I, are closed. The control lever of the material to the sun 88. To release the pressure valve It? is turned to the ‘position marked “Air in the upper tank ‘It, the control lever of the input, hoist,” soas to permit air under pressure valve I15 is ‘moved to v a position indicated by the from the waste air tank I49 to ?ow through the 75 letter a, Iin whichv position the air from the upper and a pressure indicating device v22H may be 2,413,479 9 tank 19 is permitted to move through the conduit I19, the valve 115, the conduit I52, through the valve I48, and to the Waste air tank [49, the operator being noti?ed when the maximum pres sure in the waste air tank I49 has been reached, either by a single device, or by the blowing oif of the safety valves l5ll. At this point the oper ator may move the control lever of the valve I75 to the position indicated by the letter I), so that 10 formed respectively in the latching lever 249 and the lever 239, the apertures being alined when the latching lever prevents movement of the lever 239, as shown in Figures 5 and 6. The solenoid core 25| is biased to the locking position, shown most clearly, in Figure 6, as by a spring 25m, and the construction and arrangement is such that when the solenoid 259 is energized the core 25! will be drawn into the solenoid, against the bias of the spring 25m, thereby withdrawing the remainder of the air under pressure from 10 the core 25! from the apertures 246a and 239a the upper tank 19 may ?c-w through the conduit and releasing the levers 246 and 239 for desired I19, the valve H5, the conduit 1'53, to the dust manual movement. separator I61, through the mu?ler I69, and to the Referring to Figure 4, it will be noted that when atmosphere. After all the air under pressure has the valve plunger 233 is moved to open position, 15 been removed from the upper tank 19, the control the valve-body 234 will engage the elongated tube lever of the valve H5 may be returned to its 2%!) and cause the valve-body to pivot about the “dead” position. The valve 89 may then be valve plunger 233 to its open position as shown. opened, and material may again be hoisted from The air inlet conduit ‘l4, and the air blow-off the hoist tank ‘H to the upper tank 19. conduit 15, may be suitably coupled to spuds se Referring to Figure 4, the hoist tank ‘H com cured to the top wall 2“ to the tank ‘H. The prises a cylindrical body Zlil having an integral tube 2:19 is suitably connected to and in com dome-shaped top 2| I and a downwardly tapering munication with the conduit ‘It preferably of bottom 2 l 2, the extremity of the bottom 212 being rubber or rubber lined, and if desired the conduit provided with a clean-out opening 2l3 which is closed by a plug 2M, and extending centrally of 25 76, or the rubber lining thereof, may be contin uous with the lining of the tube H9. the tank ‘H is an elongated preferably metallic The high level and low level responsive devices tube 2 l 9 open at its lower end and screw-thread 12 and 13 respectively comprise housings 254 ed at its upper end and received within a coupling rigidly carried by the tank 1|, as by means of 220 secured to the top 2!! of the tank 7!. The tube 2I9 is ‘desirably provided with a rubber lin 30 plugs 255 threaded into collars carried by the cy lindrical portion 219 of the tank 1|. Rotatable mg. within each of the plugs 255 is a shaft 256 carry The solids inlet valve ‘m is carried by the top ing a vane 251, the vanes being each suitably 2!! of the tank ‘H, the top 2! l having an interi biased to a generally horizontal position as shown orly screw-threaded tube portion 223 secured thereto, as by welding, the tube portion 228 35 by the vane on the high level indicating device .12, and being moved to a generally vertical posi screw-threadedly receiving a tubular part 229 tion, as shown by the'vane of the low level de which in turn screw-threadedly receives a nipple vice 13, by the material within the tank 1 I, move 230 forming part of the valve casing, the con ment of the shafts causing operation of switch struction being such that the axis of the valve 10 is at an angle to and intersects the axis of the 40 means within the respective housings 255, as will more fully appear. As shown in Figure 4, the elongated tube 2“). The valve ‘19 has an inlet tank 1! also carries a pressure responsive device port 23! communicating with the discharge end 258, responsive to pressure within the tank, and 69 of the elevator 83, and also has a bearing 232 constructed and arranged to actuate a switch for a valve plunger 233. Pivoted to the lower end 259 connected thereto for a purpose to be set of the valve plunger 233 is a cap~form valve body forth. 234 formed with an annular recess 235 arranged The connection conduit 11, as best shown in with a gasketed seat to close the inner extremity Figure 10, comprises stub portions 269 and 26!, of the tube part 229 when the valve body is in respectively connected to the air strainer tank 18 closing position, as best seen in Figure 5. The upper outer extremity of the valve plunger 50 and the upper tank 19, the stub portions 260 and 26!. being connected to oppositely disposed 233 is provided with a transversely disposed pin branches of a three-way ?tting 262, the other 23% engageable with the de?ning margins of slots branch of the ?tting 292 having therein a bush 23‘! formed in respective arms 238 of a bifurcated ing or gland 263 through which is disposed a tube operating lever 239, the lever being pivoted on a 258 the outer end of which is coupled to the con pin 240 carried by arms 2M extending from the duit ‘i6 and the inner end of which is formed with casing of the valve ‘Ill. The lever 239 is operable a downwardly curved spout 269 directed toward by a handle portion 2112. Rotatable with the the stub portion 26l of the conduit 11. lever 239 is the casing 243 of a mercury switch. The air strainer tank 18 is supported from the The casing of the valve 19 is also provided with a pair of ears 2M, carrying a pivot 245 for a swing 60 connection conduit 11, as best shown in Figure 10, the portion 260 passing through and being able latching lever 2&6, the lever having an oper suitably fastened to a bottom closure plate 210 ating handle 24'! and also having a notch 248 for for the tank ‘[9. As can be seen in Figures 3 and receiving a tooth or detent 2133 carried between '7, the strainer tank 18 has a top closure plate 211, the arms 238. As shown in Figure 5, with the valve 70 in closed position, the detent 249 ?ts into 65 and a conduit 2T9 establishes communication be tween the interior of the tank T8 and the interior the notch 2A3 of the lever 246, and prevents open of the dust separator [91. The lower open end ing movement of the valve 19. The valve 10 may of a dust bag 283, such as a dust bag ordinarily be opened by manually engaging the operating used on a vacuum cleaner, is suitably connected handle 24'! and moving the latching lever 256 so as to disengage the detent 2119, movement of the 70 to communicate with the conduit portion 26!]. Means may be provided for shaking the bag 283 lever 239 causing the detent 249 to ride on the so that it may be kept in condition to ?lter and adjacent marginal surface of the lever 266. to permit the escape of the air used to hoist the Means may be provided for locking the latch material to the upper feed tank 19, and for that ing lever 249, as a solenoid 250 having a core 25l adapted to ?t slidably in apertures Zita and 23911 purpose the present embodiment comprises a 11 2,418,479 plunger 289 suitably passing through the top closure plate 211. The stub portion 261 of the connection conduit 11 is screw-threadedly received within a tubular portion 291 (see Figure 10) forming part of the housing for the valve 30 associated with the up per feed tank 19. The upper tank 19 has its upper and lower portions 298 of conical form. part of the bore of the tube 310 extends to near the inner end of the tube 319 so that the pack ing 331 effectively prevents grit from getting be tween the journal surface of the shaft 312 and the cooperating bearing surface of the gland 3111a. ~ The lower feed tank 81 is formed in all re spects similar to the upper tank 19, having upper and lower conical portions 339, and also upper open, and are surrounded by integral ?anges 301 10 and lower ?anges 333 and 334 respectively. and 302 respectively. An annular ?ange 303 Underlying the lower ?ange 392 of the upper overlies the upper ?ange 301, a gasket 3114 be tank 19 is an annular ?ange 335 (see Figure 10) ing interposed between the ?anges, and bolts 305 having a central screw-threaded aperture, and pass through apertures in the ?ange 303 and are overlying the upper ?ange 333 of the lower tank received within screw-threaded apertures formed 8171s an annular ?ange 336 also having a cen in the ?ange 301. The ?ange 3113 is formed with tral screw-threaded aperture, and the connection a central screw-threaded aperture for receiving conduit 82 between the upper tank 19 and the the lower threaded end of the tube portion 291, lower tank 81 comprises a tube portion 331 which and a valve-seat block 391 (see Figure 11) is extends between and has screw-threaded ends ?tted into the lower end of the tube portion 291, 20 respectively received in the apertures formed in and desirably is welded to the tube portion 291, these ?anges 335 and 336. The tube portion 331 as shown at 398. Also the block 301 is formed forms part of the valve housing for the valve with a valve seat 3139, and extends partially into 83. Extending transversely from the upper end the upper open end of the upper tank 19. of the tube portion 331 is a bearing tube 338 in Extending transversely from the upper end of which is journaled a valve operating shaft 339 the tube portion 291 is a bearing tube 310, a web having a squared end 340 for receiving an inter 31 1 reinforcing the connection between the bear mediate portion 341 of a valve operating lever ing tube 313 and the tube portion 291, and jour 342. The inner end of the valve shaft 339 is The upper and lower ends of the tank '19 are naled within the bearing tube 31 [1 is a valve oper ating shaft 312 having a squared outer end 313 for receiving one end 314 of a valve lever 315. The bearing tube 310 extends a slight distance within the tube portion 291, and the operating shaft 312 at this point is reduced in diameter and squared to ?t into a squared opening formed in a crank 316, a set screw holding the crank connected to a crank 343 in the same manner as the shaft 312 is connected to the crank 316. A rod 344, similar in all respects to the valve arm 319, is connected to the crank 343, and carries a resilient valve body 343 which cooperates with a valve-seat block 346, the parts 345 and 346 be ing similar to the parts 321 and 301 hereinbefore described. The valve shaft 339 may be packed 316 to the shaft 312. The crank 316 carries an in the same way as the shaft 312. off-center pin 311 (see Figures 11 and 12) ?t The air strainer tank 18, and the upper and ting through a slot 318 formed in a‘?attened lower feed tanks 19 and 81, may be at least in portion 321 of a rod 319, the pin 311 having a 40 part carried by a frame structure 341, resting headed portion 320 holding the rod assembled on upon a suitable supporting surface. The upper the pin 311. The rod 319 also has a portion 322 and lower tanks 19 and 81 are further held rig round in cross-section and slightly bent, as best idly connected by means of a plurality of con shown in Figure 12, and the lower end of the rod necting rods 350 (see Figure '1) extending be 319 is formed with a conical enlarged portion 45 tween angle pieces 351 fastened to the respective 323 and with a reduced extremity 324 forming a tanks. shoulder 325 with the conical portion 323. A Referring particularly to Figures 7 and 8, the frusto-conical block 326, having a central aper valves 80 and 93 are adapted to be moved in a ture, is ?tted on the reduced extremity 324, and predetermined order by operating means 356. a resilient valve body 321, preferably formed of 50 The valve lever 315 has a pin 351 spaced from rubber and having a generally frusto-conical out the valve shaft 312, and the extremity of the line, is ?tted over the reduced extremity 324, and valve lever 315 is provided with a weight 358 an inverted cup-shaped disk 328 is positioned to arranged to urge the valve lever arm 315 to its hold the valve member 321 in position, a nut 329 valve-closing position shown in Figure '1. A resil being screw-threaded on the end of the reduced ient stopper block 359, desirably formed of rub extremity to hold the disk 328, the valve mem ber, is carried by the upper tank 19 in position ber 321, and the block 326, in position on the to limit movement of the weight 358. The valve valve arm 319, the nut preferably being welded‘ lever 342 has a pin 36!] carried spaced from to the disk 328 as best shown in Figure 11. the valve shaft 339, the pin 360 being in longi The valve 33 is shown in closed position in 60 tudinal alinement with the pin 351 carried by Figures 10 through 12. Sufficient rotation of the the arm 315. The valve lever 342 carries a weight shaft 312 in a direction to cause counter-clock 361 arranged to urge the lever 342 to its valve wise movement of the crank 316, which reference closing position shown in Figure 7, a resilient to its position shown in Figure 12, will cause un stopper block 362 being carried by the lower tank seating 0f the valve body 321 from the valve seat 81 in position to limit movement of the weight 399. The slot 318 permits the valve body 321 361. to be pressed more ?rmly against the seat 309 by The operating means 356 further comprises a ?uid pressure within the tank, and also permits pair of longitudinally spaced-apart elongated the pin 311 to give a hammer blow to the lower metallic strips 363 and 364, the strips being ad end of the slot in opening the valve. 70 justably connected by a turnbuckle arrangement The bore of the bearing tube 310 may be en 365. The strip 363 has an elongated slot 366 larged so as to accommodate between it and the for receiving the pin 351 carried by the valve shaft 312 a tubular gland 319a forced against lever 315, while the strip 364 has an elongated packing 331 by a gland nut 332 threaded on the slot 361 for receiving the‘pin 360 carried by outer end of the bearing tube 310. The enlarged 75 the valve lever 342.‘ A coil spring 368 has its 2,413,479 13 tion. ends connected respectively to the pins 351 and 380, the spring 368 additionally urging the valve levers 3&5 and 342 to their valve-closing posi 14 The valve 85 is interposed in a conduit 388 which has its upper end connected to the tube portion 353. The conduit 386 is reduced in diameter with respect to the tube portion 353,v and the free end of the conduit 386 is pro vided with a pair of nipples 381. A control device tion shown in Figure '1. Connected to the lower end of the strip 364 is an elongated rod 369 having its lower end piv 388 is positioned adjacent the tube portion 353, otally connected to one arm 310 of a bell crank leverv 31!.v The lever 31! is pivoted at 312 to a. supporting frame 313 carried from a suitable supporting surface. Also carried by the sup porting frame 313 is a quadrant 314. The other arm 315 of the bell crank lever 31f is positioned to indicate when a low level in the ‘lower, tank 81 has been reached, the device 388 comprising a pivoted vane 389 disposed within the tube por tion 353, a shaft carrying the vane being rotata ble with the vane and being adapted to actuate mercury switch means 390 disposed within a housing 39!. When the level in the lower tank 8! falls below the level of the vane shaft, the vane moves upwardly, thus causing desired actu ation of the mercury switch 390. In the embodiment shown (see Figure 7), one of the nipples 381 of the conduit 386 is closed to traverse the quadrant-314 and includes an indicating portion 318 and an operating arm 311. The quadrant 31E is provided with three notches‘ 318 located on the quadrant at the posi tions marked with the legends “fill,” “compress,” or “blow-off,” and “dump.” The operating arm 311 has a manually releasable spring-pressed detent engageable within any one of the notches 20 by means of a cap closure 392, while the other nipple 381 has securely clamped thereto one 318, to hold the arm 311 in any one of the posi end of the conduit 86. The conduit 88 comprises tions. The quadrant 314% also carries a solenoid a heavy-duty ?exible tube 383, within which is 319 having a core 380 which is adapted to be 7 disposed a heavy-duty rubber hose 394, having moved into the position shown in Figure 9 by its one end securely fastened over one nipple a spring 388a when the solenoid is deenergized, 381 and its other end extending into a "union so that when certain conditions exist, as will joint suitably connected to the breech 81 of the appear, the core will extend into the path of gun 88. movement of the indicating device 318 to pre In the simplest embodiment, the gun 88 serves vent the operating arm 311 from being moved to “dump” position. to project the material at high velocity against 30 an anvil, as fully described in application Serial With the operating lever 311 in the position shown in full lines in Figure 8, that is, in the Number 308,002, whereby the material'is disrupt ed by impact. To propel the material through “fill” position, the valve levers 315 and 3&2 are in the position shown in full lines in Figure 8, the gun 88 air pressures as high as 500 pounds per square inch to the order of 1000 to 1500 pounds per square inch, or higher, may be utilized, this and the valve 80 is open and the valve 83 is ' closed, thus permitting material to be delivered compressed air being supplied to the gun from to the upper feed tank 18, while at the same time permitting the maintenance of an operating pressure within the lower tank 8|. It will be noted that the slots 388 and 381 respectively the tank 8|. The gun 88 may include a booster jet, indicated in Figure 3 by the diagonal arrow against the diagrammatically indicated gun, and this ‘jet may be connected to a conduit 434a (see formed in the strips 363 and 364 are so propor Figure 3) which is tapped into the main air pres tioned that the weight 38! may maintain the sure conduit I89 ahead of the regulator‘ I80, so valve 83 in its closed position, while the weight that if desired air may be delivered to the jet 358 is lifted to provide opening of the valve. 80. When the operating lever 311 is moved to > under a pressure either higher or lower than that under which the air flows to the lower tank 81, the “compress” or “blow-off” position, the valve thereby to permit adjustment to secude the opti levers 3i5 and 342 are in. the position shown in mum qualitative-quantitative output. A manu Figure '7, in which position the valves 80 and ally operated valve 436 is interposed in the con duit 434a to control the ?owof air to the jet and this valve is preferably closed and opened when the valve 85 at the outlet of the lower tank 8| is closed and opened. A regulator may be in terposed in the conduit 434a. if desired. 83 are closed, thus permitting ?uid under pres sure to be admitted to the upper tank 19, while ' still permitting normal operation of the lower tank 81. When the “operating lever 311 is moved to “dump” position, that is, the dotted line posi tion shown in Figure 8, the valve levers 3I5 The gun 88 may be of various embodiments, and more than one gun may be utilized, as fully de and 342 are moved to the position shown in ‘7' dotted lines in Figure 8. in which position the scribed‘ in application Serial Number 308,002. valve 8i] is closed but the valve 83 is open, the valves standing in these relations when the pres sures in the tanks 19 and 8! have been equal i‘zed, so that material from the upper tank 19 may pass to the lower tank 8|. As vbefore mentioned, interlock means are pro vided, so constructed and arranged that certain parts of the apparatus are‘ permitted to operate only when certain other parts are in a predeter mined relation. Figure 13 shows an electrical di During initial charging, it is preferable to close the valve 85 at the outlet of the tank 8|, move agram of‘ the parts comprising the interlocking means and also parts comprising signaling means. The devices shown in Figure 13, together with their relation to other parts by which they are controlled or which they control, are as follows. The switch housing 243 carried by and for move ment with the operating lever 239 on the solids ment of the valve 85 being effected by a chain 38! movable about a pulley 882, the chain being connected to a lever 385 connected to the plug of the valve 85. The chain preferably has its operating end positioned adjacent the operating arm 311. - inlet valve 10, contains two mercury switches 625 and 626. Rotatable by the vane of the high level Underlying the lower ?ange 334 of the lower tank 8! is an annular ?ange 352 having a cen tral screw-threaded aperture receiving a tube portion - control 12 of the hoist tank are two mercury A suitable gasket 854 is interposed . ~ between the ?anges 334 and 352, and bolts 355 hold the ?anges 334 and 352 in assembled rela-’ switches 621 and 628, and rotatable by the vane ofthe low level control 13 of the hoist tank 1| are two mercury switches 629 and 630. Rotatable 15 2,413,479. with the operating lever of the three-way valve ' 16 motor switch 662 is closed, the circuit of the I62 which controls ?ow of air to or from the motor 61 is from the main line wire 656, through hoist tank 1| is a switch housing containing two the motor switch 662, the armature of the motor mercury switches 63| and 632. The solenoid I12 61 and the ?lament of the lamp 68 in parallel, cooperates with a core 634 connected to the valve through a conductor 663, the then bridged termi "I in the blow-01f conduit I16, so that when the nals 625a of the mercury switch 625, a conductor solenoid is energized the valve |1| is opened. 664, the then bridged terminals of the mercury Rotatable with the shaft 3|2 of the valve 60 is switch 628 contained within the high level con a casing 635 containing two mercury switches 636 trol 12, and a conductor 665, to the other main and 631. The solenoid |6|, which operates the 10 line wire 651. When the level of the material valve I66 in the air inlet conduit I56, cooper reaches the axis 256 of the high level control 12, ates with a core 666 connected to the valve I66 so the vane 251 of the high level control is moved that when the solenoid I6| is energized the valve to rotate the‘ mercury switch 626, the mercury I60 will be opened. Rotatable with the operat of the switch 628 moving away from the terminals ing arm of the three-way valve I95 which con 15 of the switch and interrupts the circuit, thus trols ?ow of air to the upper tank 16 is a housing stopping the elevator 66. At the same time the 640 containing a mercury switch 64L The hous mercury in the switch 621 bridges the contacts ing 6| forming a part of the high level control of of that switch thereby completing a circuit for the receptacle 66 contains a mercury switch 645, a bell 666 or other signal, from the line 651, and as before pointed out, the low levelcontrol 20 through a conductor 661 in which the switch 621 62 in receptacle 66 is mechanically connected to and bell are interposed, through the switch 662 the high level control switch. The pressure re to the other line 656. A switch 668 may be pro sponsive device 256, disposed within the hoist tank vided to manually interrupt the circuit of the 1|, operates the switch 256 which comprises con signal 666. tacts 646 which are held in open position by the 25 The solids valve 16 is then closed, as by moving pressure responsive device 258 when a pressure the operating lever 239 to its position shown in above atmospheric pressure exists in the tank 1|, Figure 5, and the latching lever 246 is moved to but are biased to closed position in any suitable latching relation with respect to the lever 239. manner when there is no pressure within the hoist This is possible because there is no pressure in tank 1|. A housing 656 is rotatable with the 30 the hoist tank 1| and‘ hence the switch 259 is shaft 336 of the valve 63 and contains a mercury closed. The switch 256 completes a circuit for switch 65 I. the solenoid 256, since the solenoid and the switch The devices shown in Figure 13 are connected 259 are interposed in seriesin a conductor 683 the to operate as follows. A master switch 655 con ends of which are connected to the line wires 656 trols the energization of main line wires 655 and and 651 respectively. Since the solenoid 250 is 651, and all of the electrically operated parts of energized, the core 25| has been withdrawn from the apparatus receive electrical energy from these the path of the levers 238 and 246. line wires. To start the apparatus, the master With the operating lever 236 of the solids in switch 655 is ?rst closed. Assuming material is let valve 16 in closed position, the casing 243 already in the new-materials container 56, a mo 40 will be rotated, so that the mercury in the switch tor switch 658 is closed to cause energization of 625 bridges the terminals 625b and at the same the motor 56 to start operation of the elevator time unbridges the terminals 625a. Unbridging 54. Simultaneously the light 51, in shunt with of the terminals 625a prevents operation of the the motor 56, is energized, to indicate operation motor 61 when the solids valve 10 is closed. With of the elevator 54. The circuit of the motor 56 .' material in the hoist tank 1| at a level a de and lamp 51 is from line wire 656, through switch sired amount above the lower end of the tube 2|9, 656, the armature of the motor 56 and the ?la the vane 25'! of the low level control 13 will rotate ment of the lamp 51 in parallel, through the closed the mercury switch 636, so that the mercury will contacts of the mercury switch 645 of the high bridge the terminals 636a. Then, if it is desired level control 6|, through a conductor 666 con- . to hoist material, the operating lever 311 of the nected to the other line Wire 651. Thus it will operating means 356 is moved to “?ll” position, be obvious that the operation of the motor 56 is so that the valve 66 is open, while the valve 83 dependent upon the position of the switch 665 between the upper and lower tanks is closed, and contained in the high level control 6|, the con the operating lever of the three-way valve I62 struction being such that when the level of ma- . is moved manually to “air input, hoist” position, terial falls below the low level control 62, the thus rotating the mercury switch 63I, so that switch 645 is operated to cause energization of the the mercury will bridge the terminals of this motor 56, and when the level of the material switch. The opening movement of the valve 80 rises to the high level control 6|, the switch 645 causes the mercury in the switch 636 to bridge is operate to interrupt the circuit of the mo 60 the terminals 636a. When all this has been done, tor 56. the solenoid |6| will be energized, thus opening The operation of the motor 61 of the elevator the valve I66, so that air may ?ow from the waste 63 is dependent upon the position of the high air tank I 49 to the hoist tank 1|. The circuit level control 12 on the hoist tank 1|, and on the for the solenoid |6| is from the line wire 656, position of the solids valve 16, which latter is through the solenoid I 6|, a conductor 669, the in turn controlled by the pressure. responsive contacts 666a, a conductor 610, the switch 63l, device 258, responsive to the presence or absence a conductor 61|, the contacts 636a, a conductor of a pressure within the hoist tank 1|. The 612, the contacts 625b, and a conductor 613, to connections are such that in order to effect op eration of the elevator 63, the valve 10 must have been opened (which requires zero pressure in the hoist tank 1|), and the level of the material with in the hoist tank 1| must not be above the axis the line wire 651. It is of course clear that open position of any one of the switches in series with the solenoid |6| will prevent energizing of the solenoid, preventing air supply from the valve I 60 unless all is in readiness, 256 of the operating vaneg261 of the high level When enough material has been hoisted. from control 12. When these conditions exist, and a 75 the hoist tank 1|, so that the level of the mate 1214132479 ,17 :rial falls below 1 the axis 256 of the vane 251 of the low level device 13, the vane 251 will'ri'se, thus rotating'the switches 629 and 639, the mer >cury of the. switch 630 now bridging the termi nals 63017, and the mercury in the switch 629 now bridging the terminals of that switch. Bridging of‘the terminals 63Gb lights a signal 18 the valve I95 is moved from “compress” posi tion to “equalize” position, such movement caus ing rotation of the casing 649, so that the mer cury bridges the terminals of the mercury switch 6M, and causes energization of the solenoid 319, thereby withdrawing the core 369 from the path of movement of the indicating portion 316 of the operating lever 311, The solenoid 319 is so lamp 618, which may be of amber color, to in energized since it and the switches 6M and 631 dicate that a low level has been reached, the 10 are connected in series in a conductor 691 the terminals 639!) and the, lamp 618 being .inter ends of which are connected to the line wires posed in series in conductor 680, connected at its 656 and; 651, it being remembered that theswitch ends to the line wires 656 and 651. The interrup 631 was previously closed by closure of the valve tion of terminals 630a, interrupts the previously 99. The operating lever 311 may now be moved traced circuit of the solenoid I6I, thereby caus 15 to “dump” position, whereupon the valve 60 at ing closure of the air inlet valve I66. At the same the inlet of the upper feed tank 19 remains time, bridging of the terminals of the switch 629 closed, and the valve 63 between the upper and causes energization of the solenoid 112, thereby lower tanks is opened, such movementiof the causing opening of the blow-off valve I1 I. The valve 63 causing movement of the casing 659, solenoid I12 is energized from the line wire 656, so that the mercury in the switch 65! bridges the 20 a conductor GBI in which the solenoid is inter terminals 65lb, thereby causing energization of a posed, a conductor 682, through the terminals of red light 688, which is interposed in series with switch 629, through conductor 689, to the line the terminals 65“) in a conductor 689 the ends wire 651. Closing of the inlet valve I60 and of which are connected to the line wires 655 and opening of the blow-off valve I1I of course re 651. The red light 688 indicates that material is 25 lieves the pressure in the hoist tank H and hoist being dumped. The green lamp 685 is out, by ’ ing of material ceases. reason of opening of terminals 65Ia, if the valve Material having been, hoisted into the upper 83 is open or is not tightly closed, and the red feed tank 19 from the hoist tank 1|, the oper lamp 688 is lit when the valve 93 is open or ating lever 311 of the operating means 356 is not tightly closed. “then moved along the quadrant 314 from “?ll” After the material has been dumped from the position to “compress” position, thus causing clo upper feed tank 19 to the lower tank 9|, the sure of the valve 89 at theinlet of the upper operating lever 311 of the operating means 356 .tank 19. The valve 83 between the upper and ' is moved along the quadrant to “blow-oil” po lower tanks remains closed. With the valve 83 sition, in which position the valves 89 and 83 closed, the mercury switch 65I carried by the cas 35 are still closed, and the operating lever of the ing 659 rotatable with the valve 83, is in such valve I95 is moved from “equalize” position to position that the mercury bridges the terminals “dead” position, the latter action immediately 65Ia of the switch 65I, causing energization of causing deenergization of the solenoid 319, so a green light 695, and the green light is ener that the core 389 is moved by the spring 389a 40 gized at all times when the valve 83 is tightly to the position wherein it prevents the operat closed; The green lamp 685 and the terminals ing lever 311 from being moved to “dump” po 65m are interposed in series in a conductor 664 sition. The movement of the operating lever of connected at its ends so as to be energized from the valve I95 to “dead”.position e?ects de'energi the line wires 656 and 651. Closing of the valve 45 zation of the solenoid 319, since in that position .80 causes rotation of the switch casing 635, and ‘the mercury in the switch 64! is moved from effects shifting of the mercury switches 636 and bridging relation with respect to the terminals of 631, so that the. mercury. within the switch 636 the switch. The valve 85 at the outlet of the unbridges the terminals 636a and bridges the lower tank 8| is then opened to permit the fluid terminals 636b, and, the mercury in the switch under pressure in the lower tank to convey the 631 bridges the terminals of that switch. Bridg material within the lower tank to the gun breach ing of the terminals 636b, completesv a circuit _81 and gun 8B. . for the solenoid I12, from line wire 651, through To give a signal before the material is com a conductor 686 in which the terminals 6361) pletely exhausted from the lower tank ill, the are interposed, to the conductor 69 I, through the switch 388 is so arranged in the outlet conduit 55 solenoid I12, to the line wire 656. This insures of this lower tank that when the material falls that the blow-off valve I1I will be open when .below the pivot of the vane 389, the vane may the valve 86 is closed, so that even if air under be spring pressed or otherwise moved to a sub pressure seeped into the hoist tank ‘II, it could stantially horizontal position, so as to energize ,not set up pressure that could cause hoisting a red light 699, and to cause ringing of a bell of material at this time, which would be unde 60 69!, the circuit for the lamp 699 being from sirable, because the valve 86 is closed, and hoisted the line wire 656, the conductor 686, a conductor .material "would -be1 blown’ into the bag 283. The 693, through the lamp 696 and the switch 390, control-lever of the valve I95 is, now moved to to the conductor 666, to the line wire 651, and .“compress” position, such movement causing ro the bell 69I' being connected in shunt with the tation of the switch casing 649 movable with 65 lamp 695], and if desired, controllable by a fur the ‘operating lever of the valve, in such direc ther switch 694. tion” that the mercury is moved from bridging ' To relieve the upper tank of pressure, so that relation with respect .to the terminals of the this tank may be in condition to receive another rswitchi64I, thereby‘ insuring deenergization of charge of material from the hoist tank H, the the solenoid 319v so that the core 389 prevents 70 operator moves the operating lever of the valve movement ofethe lever, 311 to the “dump” posi I15 to the position indicated by the letter a,thus tion at this time. ~ v permitting flow of air along the conduit I19, After-the’ pressure in'the vupper tank 19 has through the body of the valve I15, through the been ‘raised. to‘or substantiallyv near the'pres conduit I52, to the waste air tank M9,,until the sure in the lower tank 8i, the operating lever of 75 42,413,479 1 19 20 "safety Valves I56 indicate that the tank I49 has received its full charge, at which point the oper enabled to be continuous‘, but 'interruptible' when ator moves the operating lever of the valve I 15 to From the foregoingiit' also'will be apparent to those skilled in :the art that ‘the illustrated ap desired. the position indicated by the letter b, ‘to permit the remaining air to flow from the upper tank 19 ‘ ' ‘ ‘ J paratus embodying my invention provides new through the conduit I19, through the body of the and improved apparatus for carrying out‘the proc valve I15, and ‘through the conduit I 13, to the essing of materials, and, accordingly accom air separator I 61, through the mu?ier I69, and to plishes the principal object of my invention. On the atmosphere. After all the air under pressure the other hand, ‘it also will be obvious to'those has ‘been exhausted from the upper tank 19, the 10 skilled in the art that the illustrated embodiment operating lever 311 may be returned to “?ll” po of my invention may be variously changed and ' sition, thus opening the valve 86, so that the upper modi?ed, ‘and features thereof, singly ‘or collec ‘tank 19 is in condition to receive another charge tively,'embodied in combinations other than those 1 of material. " > v ‘Assuming that the valve -I62'is~ in the “dead” position, that the solids valve 16 is open, and that the low-level control 13 is in the position corre sponding to low level of material in the hoist-tank, the terminals of the switch 632 associatedgwith the 0f the valve switch I62 626 will associated be bridged, with'the and thesolids terminals valve 10 will also be bridged. This completes a circuit for the solenoid I12 from the line wire'651, the conductor 695 in which the switches 626 and 632 _ are interposed in series, to the conductor 632, ‘to the conductor 68I, through the solenoid I12, to thevline wire 656. ‘Therev is also a circuit for the solenoid I12 from the line wire 651, the conduc ‘tor 680, the conductor 682 in which the switch - 629 is interposed, the conductor 68L through. the ' ~ solenoid I12, to the line wire 656. Assuming that the elevator motor 61 is set in operation, as here inbefore described, and the level of material rises in the hoist tank 1|, when the level rises enough to cause the low level control 13 to respond, the switch 629 opens, but the solenoid I12 remains energized as long as the switches 626 and 632 are closed, and even after the switches 626 and 632 _ are opened, the solenoid I12 still will remain en ergized, if the valve 86 is in such position that the terminals 6361) of the switch 636 are bridged. Besides the automatic control of the solenoid I12 for the purpose of opening the blow-offv valve I1I, to relieve pressure in the hoist tank H, the pressure may be relieved manually by moving the ' control lever of the valve I62 into the “blow-off” position, whereby the air may ?ow out through conduits 14 and I64, through the valve I62, to the conduit I66, to the conduit I13, and thence to atmosphere, at the mu?ler I69. _ The valve 35 is closed when initially charging vthe apparatus, and may also be closed for inter .rupting the process ‘temporarily without relieved ’ illustrated;withoutideparting from the spirit'of is my invention or sacri?cing the advantages thereof, and'a'ccordingly, that'the disclosure ‘herein is il lustrative only,"and that my invention is‘n‘ot’lim ited thereto.‘ I claim: " " ' ‘ ' ‘ I ' ' ' - 1. Means for conveying material bymeans of ?uid under pressure, comprising: a tank having an inlet through which material may be received and an outlet through which material maybe discharged‘; valve" means controlling said mate rial inlet; means adapted to locksaid material inlet valve means in closed position';v7operating means, for operating'said material inlet valve means, ‘so constructed and arranged ‘that it is operable to open said“ valve ‘means-"only vwhen said locking means iscaused to release said ma terial inlet valve means; means for introducing ?uid under pressure into said tank; said tank having an outlet through which ?uid under pres sure may be discharged; valve means controlling said pressure outlet; means, responsive to the level of material in said tank, so constructed and arranged that said pressure‘ outlet valve means is actuated to open position to reduce the ?uid pressure‘ in said tank to atmospheric pressure when the level of material in said'tank is below a"predetermined level; means responsive to the ?uid pressure in said tank;_ahd means, control ling said locking means -in_ response to said pres sureres'ponsive means, so constructed and ar ranged that said locking means releasessaid ma terial inlet valve means vupon reduction in said ?uid pressure to atmospheric pressure. ‘ _' 2. Means for conveying material by means of ?uidrundervpressure, comprising: a tank‘having ‘an inlet through which material may be received and " an outletthrough which material may be discharged; valve means‘ controlling said 'mate rial inlet;_ means adapted to, lock said material pressure on the lower feed tank 8|, or at the end ‘inlet valve‘ means in closed position; operating of a run prior to a subsequent initial charging 55 means, for operating‘sai'd material inlet valve or beginning of operations. In other Words, it is means, so constructed and arranged that it is closed before initially charging, or at the end of a‘ day’s run, or for temporary interruption, and it is opened when beginning operations, as at the beginning of a day, or after an interruption as for ‘ inspection or adjustment of other equipment. While the material in the lower-feed tank8l is being ground, the hoist tank 1| will have again been ?lled, with either new material or with a: mixture of new and partly ground material from ,overage from the screen 96, and’ this" charge will have been hoisted, and all is in readiness to “dump” the same into'the tank 8I' when the -“low level” responsive ‘device in the loweritank, BI in dicates suf?cient evacuation to receive the next charge'from the upper feed tank16. " ‘ , From the foregoing description of the apparatus and-the operation thereof; it will 'be apparent ‘ that Operation of the apparatus and'proces'si'affe * operable to open said'vmaterial inlet valve means only when said locking means is caused to re lease said material inlet valve means; said tank having a pressure outlet through which ?uid un- der pressure may be, discharged; valve means controlling said pressure outlet; ‘said ‘tank hav ing a pressure inlet through which ?uid under ‘pressure may be admitted; valve means control lingsaid pressure inlet‘; means,vv responsive to the level 10f material in said tank, so constructed and arranged that said pressure outletf-valve-imeans ,is actuated to open'p'osition' and'lsaid pressure inlet valve means isactuatéd to' closed position ‘when the level of material in~ said tank-is‘ below “a predetermined-level to reduce‘the L?uis, pressure in, said tank to atmospheric pressure; ‘ "ea‘nsre sponsive to'the' ‘fluidprés'su‘re'iri-i‘saidi ank,‘ ~and fineans, controlling *saidil'ockingf means iii-response ‘to‘is‘aid pressurelresponsive'imea?s‘so"'cbnstruet 2,413,479 , ed and arranged that 21 said locking means releases 6 said material inlet valve means upon reduction in said ?uid pressure to atmospheric pressure. 3. In combination: a tank having an inlet through which material may be received and an outlet through which material may be discharged; 22 valve means is prevented if said second valve means is in open position; and control means for said fourth valve means, including means respon sive to the position of said second valve means and means responsive to the position of said third valve means, constructed and arranged to cause ?rst valve means controlling said inlet; means opening of said fourth valve means when said second valve means is open and said third valve for connecting said tank to a source of ?uid under means is closed. pressure; separately operable second valve means interposed in said connecting means; said tank 6. Means for conveying material by means of ?uid under pressure, comprising: a tank having having a pressure outlet through which ?uid un a ?rst inlet through which ?uid under pressure der pressure may be discharged from said tank; may be admitted, and also having a second inlet through which material may be received, and third valve means, controlling said pressure out also having a pressure outlet through which ?uid let; and control means for said third valve means, including means responsive to the position of said 15 under pressure may be discharged from said tank; ?rst valve means controlling said ?rst in— ?rst valve means and means responsive to the position of said second valve means, constructed and arranged to cause opening of said third valve let; second valve means controlling said second inlet; third valve means for controlling said pressure outlet; means for separately operating means when said ?rst valve means is open and 20 said second valve means and said ?rst valve said second valve means is closed. means; and control means, responsive to the posi 4. Means for conveying material by means of tion of said second valve means, including means ?uid under pressure, comprising: a tank having for controlling said ?rst valve means, and includ a ?rst inlet through which ?uid under pressure ing means for controlling said third valve means, may be admitted, and also having a second inlet through which material may be received; ?rst 25 so constructed and arranged that when said third valve means has been opened, said second valve valve means controlling said ?rst inlet; means means, when in open position, maintains said for operating said first valve means to open posi third valve means open, and said second valve _ tion; second valve means controlling said second means, when in open position, prevents opening inlet; third valve means in series with said ?rst valve means; means for separately operating said 30 of said ?rst valve means. ' '7. Means for conveying material by means of second valve means and said third valve means; fluid under pressure, comprising: a tank having means, responsive to the position of said third a ?rst inlet through which fluid under pressure valve means, so constructed and arranged that may be admitted, and also having a second inlet actuation of said third valve means to open posi tion renders possible operation of said operating 35 through which material may be received, and also having a pressure outlet through which fluid means for said ?rst valve means; and means, re under pressure ‘may be discharged jrom said sponsive to the position of said second valve tank; ?rst valve means controlling said ?rst in means, so constructed and arranged that opera let; second valve means controlling said second tion of said operating means for said ?rst valve means is prevented if said second valve means 40 inlet; third valve means for controlling said pres sure outlet; means for feeding material to said is in open position. tank through said second valve means; means 5. Means for conveying material by means of for separately operating said second valve means ?uid under pressure, comprising: a tank having and said ?rst valve means; and control means, a ?rst inlet through which fluid under pressure may be admitted, and also having a second inlet 45 responsive to the position of said second valve means, including means for controlling said ma through which material may be received; ?rst terial feeding means, so constructed and arranged valve means controlling said ?rst inlet; means that the operation of said feeding means is made for operating said ?rst valve means to open posi possible only when said second valve means is tion; second valve means controlling said second inlet; third valve means in series with said ?rst 50 open, and including means for controlling said ?rst valve means, so constructed and arranged valve means; means for separately operating said that the opening of said ?rst valve means is made second valve means and said third valve means; possible only when said second valve means is said tank having a pressure outlet through which closed, and including means for controlling said ?uid under pressure may be discharged from said tank; fourth valve means, ‘controlling said pres 55 third valve means, so constructed and arranged that when said third valve means has been sure outlet; means, responsive to the position of opened, said second valve means, when in open said third valve means, so constructed and ar position, maintains said third valve means open, ranged that actuation of said third valve means and said second valve means, when in open posi to open position renders possible operation of said tion, prevents opening of said ?rst valve means. operating means for said ?rst valve means; means, responsive to the position of said second EDWIN L. WIEGAND. valve means, so constructed and arranged that operation of said operating means for said ?rst Certi?cate of Correction Patent No. 2,413,479. December 31, 1946. EDWIN L. WIEGAND It is hereby certi?ed that errors appear in the printed speci?cation of the above numbered patent requiring correction as follows: Column 9, line 6, for‘ “single” read signal; column 14, line 47, for “secude” read secure; and that the said Letters Patent should be read With these corrections therein that the same may conform to the record of the case in the Patent O?oe. Signed and sealed this 4th day of March, A. D. 1947. [am] LESLIE FRAZER, First Assistant Oommissz'oner of Patents.