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May 3, 1938. R. H. GORDON 2,116,430 CONVEYING MECHANISM Filed Dec. 14, 1934 6 Sheets-Sheet 1 E'l' 0M Maia: 9 6654 El E2 lad/inf F001. INVENTOR. ?oierz‘ ff. Gordan: ATTORNEYS. .Mgy 3, 1938. R. H. GORDON 2,116,430 CONVEYING MEGHANI SM Filed Dec. 14, 1934 6 Sheets-Sheet 2 I A TTORNE Y6. May 3, 1938. R, H, GORDON 2,116,430 CONVEYING MECHANI SM Filed D'ec. 14, 1934 6 Sheets-Sheet 3 INVENTOR. Faker} ‘l1. Gordon. ATTORNEYS. May 3, ‘1938. R. H. GORDON 2,116,430 commune MECHANISM Filed Dec.v 14, 1934 6 Sheets-Sheet 4 JET-ELB t _ INVENTOR. Faber! ff G’ardazr. b 74 BY; @240” [Mn/714M’ A TTORNEYS, Mayr3, 1938. ' R. H. GORDON CONVEYING 2,115,430 MECHANISM Filed Dec. 14, 1934 - v 6 Sheets-Sheet 5 A20 ' //4 if” 43? /// /3/ /4 1:13:31 E1 INVENTOR. 7?09821‘ G’ara'brz BY ATTORNEYS. May 3, 1938. 2,1 16,430, R. H. GORDON CONVEYING MECHANISM 6 Sheets-Sheet 6 Filed Dec. 14, 1934 l - l5- ’ _ INVENTOR. ?oh’rz’ /'/. Gordon. BY [ZMVM ATTORNEYS. 2,_1"16,43o Patented May3, 1938 ' UNITED STATES ., PATENT‘: OFFICE‘ £110,430 \ _ , " ' ' CONVEYING MECHANISM Robert H. Gordon, _Detroit, Mich.I ‘assignor to Parker Bust Proof Company, a corporation of Michigan Application December 14, 1934, Serial No. 757,426 17 Claims. (CB 214-17) This invention relates to conveying mechanism and particularly, to that type thereof in which articles to be transported and treated or worked upon are adapted to travel at diiferent speeds stage of the accompanying process or treatment. _ A still further objector the invention is to pro vide a completely automatic conveying system of this kind which ‘has diverse portions constructed during different phases of movement thereof, the . and arranged and driven in- a predetermined principal object being the provision‘ of a simple, economical and e?icient mechanism of this type. Although the mechanism provided by the pres— ent invention is applicable for use wherever it is 10 _ desired to transfer and/or treat in any manner any type of articles, for the purpose of simplicity only reference hereafter will be made to its appli cation to a rust proo?ng treatment only for arti cles such as parts of automobiles, its application 15 for other uses such as plating, painting or the like and for other types of articles, and the modi?ca tion of‘ the illustrative embodiment sho_wn to adapt it to such other uses and/ or articles, will be apparent to those skilled in the art upon the dis closure herein. The invention pertains to the provision of means particularly applicable for conveying articles to be rust-proofed through the various stages of a rust proo?ng process. 25 ‘ One oi’ the main objects of the invention is to provide a conveying system of this character which may be adapted to carry articles through Washing and rinsing devices preparatory to the timed relation to move the articles in that manner which is best suited for each particular stage of a rust proo?ng process respectively. Other objects of the invention are to provide ' mono-rail sections in those portions of a conveyor ‘ 10 system of this character which are not congested and. where the articles travel a considerable dis tance without being worked upon so as to lessen the quantity of structural material required for the construction .of the system; to provide mono 15 rail sections of this kind where single ?le move ment of the articles permits access to be had to all portions thereof for washing, rinsing, or other purposes; to provide a double rail section at that portion of a conveyor system which moves the 20 articles through a rust proo?ng or other tank so as to facilitate multiple ?le movement of the articles through the bath and. to thereby allow‘ a substan tial reduction in the speed of travel of the con veyor of such portions of the system without necessitating the use of excessively long or large capacity rust proo?ng tanks or the employment of large quantities of liquid or solution at any one rust proo?ng treatment in such a manner as to 30 expose substantially all the portions of ,such arti cles to the washing and rinsing operations. _ time; to provide mono-rail conveyor sections for carrying articles in single ?le to and from the 30 stations where they are treated with rust proo?ng A further object of the invention is to provide means in conveying apparatus of this kind which automatically varies the manner of movement of 35 the articles after being subjected to one treatment 'to facilitate the treatment thereof in a tank of solution; to provide rapid acting automatically comparatively small capacity and relatively short length so as to reduce the quantity of solution re quired to be employed in the tank and exposed to 40 evaporation in the atmosphere. ‘ Another object of'the invention is to further modify the manner of movement of‘the articles automatically at the end of the rust proo?ng treatment so as to reduce as far as possible the 4 Gl time of exposure of articles wet with rust proo?ng solution to the atmosphere during transferring of such articles from the rust proo?ng tank to a ?nal rinsing tank and to thereby guard against drying of the solution on the articles. A still further object of the invention is to pro vide a completely automatic conveying system of this kind which has diverse portions constructed and arranged and driven in a predetermined timed relation to move the articles to be treated in that 55 manner which is best suited for each particular operable transfer means in the double rail section of the conveying mechanism which is adapted to remove a unit of a plurality of laterally aligned 35 articles from the rust proo?ng bath and deposit the same in a ?nal rinsing tank before the rust proo?ng solution on the surfaces of such articles has an opportunity to dry and become hardened, thereon; to provide means for automatically 40 transferring the articles from a single ?le rela tionship on the mono-rail sections of the system to a laterally aligned relationship on the double rail section of the system; to provide similar auto matic means of this kind for transferring the articles from a laterally aligned relationship on the double rail section to a single ?le relationship on successive single rail sections of the system; and to provide transfer means of this character which is operable automatically by the movement 50 of the units of articles in their normal course of travel. ' The above being among the objects of the pres ent invention; the same ‘consists in certain novel features of construction and combination of parts 2 2,110,010 to be hereinafter described with reference to the accompanying drawings and then claimed, having the above and other objects in view. An illustrative‘ embodiment of the invention is shown in the accompanying drawings, wherein: Fig. 1 is ,a diagrammatic illustrational plan view of a system for conveying articles through ‘ the various stages of a rust proo?ng process; Fig. 2 is a fragmentary, vertical, sectional view 10 taken on the line 2-3 of Fig. 1; Fig. 31s a fragmentary, side elevational view illustrating the mono-rail section of the convey ing system as viewed from line 3—-3 of Fig. 1 and showing an article holder by which a plurality of articles may be supported and moved in a uni tary fashion; Fig. 4 is a transverse, vertical, sectional view taken on the line 4-4 of Fig. 3; Fig. 5 is a fragmentary, side elevational view 20 illustrating the double rail section of the convey ing system, as viewed from line H of Fig. 1; 25 30 35 40 inlet opening 2. at its left end and an outlet opening 33 at the right end of the unit, as viewed in Figs. 1 and 2. Loading and unloading docks. represented in the drawings by corresponding legends, are also provided, at which articles to be treated may be loaded upon the improved con veying mechanism and removed therefrom after the rust proo?ng operation. The conveying apparatus includes a system of rails having sequentially spaced mono-rail sec 10 tions generally designated by the numerals 3| and ii and an intermediate double rail section generally designated by'the numeral 12. The mono-rail section 30 extends in a loop shaped course from the loading dock to the left end of 15 the double rail section 32, as viewedin Fig. 1, and the mono-rail section II extends in a re versely directed course from the right end of the double rail section 32 past the unloading dock and to the loading dock. It should be un derstood that those extremities of the mono-rail Fig. 6 is a fragmentary, transverse, vertical sec- - sections 3! and 32 which are located at the load tional view taken on the line 5-5 of Fig. 5; ing station are arranged in an aligned relation-v Fig. 7 is a fragmentary, plan view of that por ship so that there is no actual division therebe tion of the conveying system which is located at tween but that the sections are designated differ the junction of the mono-rail section of the sys ently merely for the purpose of convenience of tem and the front end of the double rail section description. thereof, illustrating portions of the driving The mono-rail sections include rails 33' of 1 mechanism of the system and more particularly shaped cross section, illustrated in Figs. 3 and 4, showing the means for transferring units of ar and the double rail section includes substantially ticles from the mono-rail section to the double identical rails 34 arranged in spaced relationship, rail sections of the system; as illustrated in Figs. 5 and 6. These rails are Fig. 8 is a fragmentary detail plan view of the supported in suspended relationship by spaced automatic switch mechanism included in Fig. 7; vertical supports 35 or other suitable means which Fig. 9 is a vertical, sectional view taken on are provided with laterally extending arms 38 the line 9-4 of Fig. 8; to which the upper ?anges of the rails are ?xed. Mounted on the vertical supports 35, directly Fig. 10 is a vertical sectional view taken on the above the laterally extending arms 36 are similar line lli—l0 of Fig.7; Fig. 11 is a vertical sectional view taken on the laterally extending arms 31 on which tracks 33 of I-shaped cross section are mounted directly above line il—_ll of Fig. 7; Fig. 12 is a fragmentary top plan view of lift the rails 33 of the mono-rail sections. The rails ing apparatus for elevating units of articles from one tank and lowering them into another; Fig. 13 is a fragmentary side elevational view 45 of the structure shown in plan view in Fig. 12; Fig. 14 is a transverse, sectional view taken on the line l4—ll of Fig. 13; Fig. 15 is a transverse, sectional view taken on the line lS-IS of Fig. 2. In Fig. 1 of the drawings is illustrated an em 50 bodiment of the improved conveying mechanism in rust proofing apparatus which generally in cludes a preliminary washing station 20 at which articles to be rust proofed are subjected to an 55 initial washing operation either by manual or by mechanical application thereto of water or other suitable cleaning agents. Located in re lated sequence with respect to the washing station 20 is a ?nal washing and rinsing station 2| 60 through which the articles are passed. The sta tion 2| preferably includes a housing or casing diagrammatically illustrated at 22 in which suit able spray devices (not shown) are provided for forcefully applying water sprays on the articles. 65 There are also diverse platforms 23 arranged longitudinally of the casing 22 for accommodating operators who may work upon the articles with brushes or other suitable tools and devices. The next successive unit of the rust proo?ng appara 70 tus includes a rust proo?ng solution tank 24, and adjacent ?nal rinsing tank and an adjacent dry ing chamber 26, best shown'in Fig. 2. The tanks 24 and 25 and the drying chamber 28 are arranged in longitudinal alignment and preferably en 75 closed within a casing or housing 21 having an 33 and tracks 38 extend throughout substantially the entire courses of such sections’. These tracks are provided for supporting a travelling driving member comprising a conveyor chain 39 having spaced substantially horizontal links 40 on which vertically extending chains supporting carriages H are mounted. Each carriage 4| includes a bifurcated end portion 42 on the opposite side arms of which arejournalled rollers 43, the rollers being engaged between the ?anges of the tracks 38 and having rolling contact engagement with the opposite sides of the lower ?ange 38' thereof respectively. ' Each carriage ll has an arm 44 extending downwardly from the chain 39, on which spaced cleats 45 are mounted. Pivotaily mounted on the outer end portions of the cleats l5 and disposed therebetween are triangular shaped latch plates 46 having substantially vertical adjacent side edges 41 and inclined outer side edges 48. Formed on the upper edge portion of the latch plates 46 are transversely extending stops 49 which are en gageable with the upper edges of the cleats 45 for preventing outward rotation of the latch 65 plates which are otherwise free to rotate in wardly towards each other. These latch plates are adapted to automatically couple with portions of carriages 50 of article holders movably mounted on the rails 33 of the mono-rail section. 70 Each carriage 50 includes a body portion ii on which are mounted vertically up-standing brack ets 52 having rollers 53 rotatably secured to their upper extremities and engaged between the ?anges of the rail 33, as illustrated in Fig. 4. 75 2,116,480 ‘ 3 the teeth of a bevel gear ‘Ill mounted on‘a ver The rollers 53 are engaged in rolling contact with the lower ?ange 54 of the rail 38. Extend tically up-standing shaft ‘H which is journalled ing upwardly from the body portion 5| or each in suitable bearings provided on the frame struc carriage 50 is a bracket 55 having a laterally extending ?ange 56 which is adapted to be re ceived between the vertical edges 41 of the latch plates 46 in order to apply thedriving or trans lating force of the chain 39 to the carriage 58. Rotatably engaged in an aperture of a plate 51 10 secured to the lower extremity of the body por tion 5! of each carriage 54 is a bolt 58 which is attached to an elongated tubular bar 59 of the article holder. The bar 59 is maintained in a substantially horizontal position during its 15 movement throughout the mono-rail sections 3| and 32 by the carriage 50 and by a similar car riage, generally designated by the numeral 69, which also includes a body portion 5! and up standing brackets 52 on which rollers 53 are ro 20 tatably mounted. The carriages 69 are sub _ stantially identical to the carriages 50 in all ' respects with the exception that they are not provided with the up-standing arm 55 and in wardly extending ?ange 56 for coupling the ar 25. ticle supporting unit with the driving chain. Each carriage 50 is provided with an apertured plate 51 in which a bolt 58 is rotatably engaged, the latter being secured to the other end por tion of the tube 59. If desired, the upper end of the bolt 58 ‘may be'?xed to their re-‘ so portions spective supporting plates 51 and provision may be madeior pivotal movement of the lower end portions of the bolt with respect to the tube 59. The conveyor chains 39 are supported in the 35 manner illustrated in Figs.‘ 3 and '4 throughout the entire course of movement of the article hold ers as de?ned by‘ the mono-rail sections 38 and 3i. ‘At the left end of the double rail section 32, as viewed in Figs..1 and 7, the supporting track 380i the driving chain 39 continues beyond the 40 end of themono~rail section '39 in a U-shaped course, as illustrated in Figs. 1 and 2, and finally ‘ extends substantially ‘parallel to the double rail section 32 along the side of the housing 21 in 45 ‘which. the rust proo?ng solution tank 24, rins The sprocket wheel 12 propels the endless chain 39 throughout its course of movement as de?ned by its supporting tracks 38, the slack in the chain being taken up at I] in Fig. 1 by suitable appa 10 ratus (not shown). The left end portions 13 of the rails 34 of the double rail section 32 are disposed in converging relationship as illustrated in Figs. 1 and 7 and they terminate in close proximity to the adja 15 cent extremity of the rails 33 of the mono-rail section 39. At the junction of the converging end portions 13 of the rails of the double rail section and one of the spaced extremities of the rail 33 of the mono-rail section 39 is provided 20 a switching mechanism for transferring one car riage of each article supporting unit to each of the rails 34 of the double rail section respectively. This switching mechanism includes a substan tially straight rail portion 14 which is pivotally 25 attached at ‘I5 to the extremity of the rail 33 of the mono-rail-section‘ 39. The rail portion 14 is adapted to swing about the axis of the pivot 15 into alignment with‘each of the converging end portions ‘I3 of the‘ double rail section. ‘ 30 The switching ‘operation is automatically per formed by apparatus including a pneumatic‘cyl inder 16 having‘ a pistonv 11 therein to which is ‘ attached a piston rod 18.‘ Theouter end‘ of ‘the piston rod 18 is pivotally secured at 19 to ‘the free 35 end portion of the pivotally mounted rail por- \ tion 14, as illustrated in Fig. 7.‘ Communicating with the respectively opposite end portions of the cylinder 13 are ?uid‘medium conduits 80 and 8| which lead to and communicate with ‘a control 40 valve 82 mounted on one of the vconverging rail end portions 13 of the ‘double rail section 32. The ' valve 82 is connected by a co‘nduit“83 with a suit able source (not'shown)‘ of fluid ‘medium and it is provided with a control member including 45 thus ‘forming a by-pass for the chain 39 to bring angularly disposed lever arms“ ‘and 85. ‘The ‘ lever arm 84 extends into‘th‘elpath ‘of the up it fr‘omthe discharging end of the mono-rail sec tion‘ 39 to the receiving end of the mono-rail of the article supporting unit by‘rwhich it is en ing‘tank 25, and drying chamber 26 are disposed, se‘ction3l. Adjacent the receiving end of the mono-rail ~section 3|, the track 38 which sup ports ‘the ‘driving chain 39 takes a 'reversely curved course‘ so asto ‘bring it into tangential relationship with respect toqthe discharge end standing bracket 55‘ ‘of’ the leading ‘carriage 50 gaged after the leading carriage 50‘ has passed 50 over the “pivoted -_rail“ portion 14‘ and‘ onto the end portion of the upper rail 34 of i the double rail section‘ 32, it being~understood that‘ the switch control apparatus normally retains the‘ pivoted of the double rail section 32, as illustrated at IS in Fig. 1‘.‘ The track 38 then follows the course of rail portion 14 in~the full line position shown 55 in. Figs. 7 and‘ 8. When ‘the leading'carriage 50 the mono-grail section 3|‘ throughout a looped path- l8 and extends leitwardly, as viewed in Fig. 1, insuper-imposed relation to the rail 33 of 84 ‘of the valve mechanism 82 ‘it rotates the‘ arm 84 and the associated'arin 85 in a‘clockwis'edirec 60 the mono-rail section‘ 3| untilit ultimately be comes aligned with the vrail of the mono-rail section’ 39“ at the loading dock. ‘ It should bewunderstuod that the chain 39 is endless and that ity is continuously, driven dur 65 ture 68. Fixed on the lower end of the shaft ‘II is a sprocket wheel ‘I2 over which the-driving chain 39 of the conveying mechanism extends. ing operation of the apparatus by suitable driv ing mechanism which in'the form shown includes an electric'motor‘ El and transmission mechanism of the article supporting ‘unit ‘engages the arm tion as viewed in "Fig. 8 so‘ as-to‘bring ‘the arm 60 85 into a 'transverselyextendin‘g relationship withrespect to‘the converging end portion 13 of the lower rail‘ 34*o‘f the ' double rail section, as viewed in Fig: 7,-’and simultaneously~ permits ‘the escape of’ the ?uid medium from the righthand 65 end of the cylinder '16 a'n‘d‘a‘lso admits'?u‘id medium to the left end of thecylinde‘r, thereby mechanism v62, includes‘ a shaft 63 on which ‘a projecting the piston ‘l1 ‘and'its'ro‘d v‘Hi-'1 rightward‘ ly, as viewed 8,1's6 as‘_"to rotate‘ the‘ piv otally mounted 'r‘ailfport‘ion “114v fin“ a ‘clockwise 'dil connected by a' chain 65with'aSD1fQcket‘ ‘wheel 66 rection. ' Thisv movement or‘ therailivportion‘ ‘l4 52,. both shown, in; Fig. 7'. “The transmission sprocket wheel 84 is‘ mounted and ‘operatively 70 brings. it‘ into alignment‘with ‘the: end portion‘of the'lower‘rail (if'pf‘fthekdouble‘r li‘sect‘ion‘ as‘ill transmission 52 ‘are supported.‘ Fixed on the lustrated in‘dotted l'inesf’in Fig; "I; This clockwise 15 Qshaft__,6‘l“is“'a bevel gear 59 which is meshed‘ with movement) of Jthe“ piiqtallv mounted mil ‘,bortibn 75 b: "ashaft ‘s1 ‘which. extends-‘transversely of the ‘irame‘structure 58 ‘by‘which the motor. GI and 4 2,116,480 14 occurs after the leading carriage 50 of the article support has been engaged upon the end portion of the upper rail 34 and before the trail ing carriage 60 has reached the end of the piv otally mounted rail portion ‘I3 and, therefore, as the article holder is propelled along by the con veyor chain._the carriage 50 is disposed on one rail of the double rail section 32 and the carriage ' 33 is disposed on the other rail thereof. During inclined upwardly to a maximum elevation sub stantially directly above the right extremity of the rinsing tank 25 and then downwardly to with in close proximity of- the outlet 29 of the casing 21. After the propelling members 86 part con tact with the carriages of the article holder, the latter is moved throughout its entire remaining length of the double rail section 32, with the ex movement of the carriage 60 past the valve 32, ception of that portion thereof ‘provided by the the lower arm 35 of the latter is engaged and vertically movable length of rails 94, by a pair returned to its normal full line position shown in of endless chains 95 supported on suitable tracks Fig. 8. This operation of the control of the valve 36 and extending around sprocket wheels 91 33 causes the pivotally mounted rail portion ‘I4 to which together with the tracks 96 are so con 15 be restored to its normal position shown in full structed and arranged as to cause one side of 15 lines in Fig. 8, where it remains until the next each endless chain to follow the course of the successive article holder reaches the junction of the mono-rail section 33 and the double rail double rail section 32, and the other side of each chain to return from one right end of the double section 32, whereupon the foregoing cycle of op eration again takes place. rail section 32 to-the' left end thereof. After the carriages I3 and 33 of the article hold er have been disposed upon their respective tracks of the double rail section 32, the path of the chain 3! begins to depart from the course of the rails of the double rail section, causing the ?ange 33 ‘of the bracket 55 of the leading carriage ill to be ,withdrawn from between the latch plates 36. The article holder is then temporarily propelled along the rails of the double rail section 32 by vane-like members 33 which are rotated about substantially vertical'axes' in timed relation to the movement of the conveyor chain 3!. ‘Each vane-like propelling member 36 is ?xed to a vertically extending shaft 31 which is journalled in suitable bearings carried by the frame struc ture 33 and which is provided with a bevel gear 33 that is meshed with the teeth of a bevel gear I! mounted on a shaft 33 extending transversely of the length of the double rail section 32. The shaft 33 is also journalled in suitable bearings and it is provided with a sprocket gear II which is op eratively connected by a sprocket chain 92 with a sprocket gear 33 mounted on the shaft 31. As the vane-like propelling members 33 are turned about the axes of their shaft 31, each one thereof engages one of the carriages of the article sup porting unit so as to move the latter to the right, as viewed in Figs. 1, 7 and 11. The double rail section 32 has an upwardly in clined intermediate portion I 3 and an adjacent downwardly inclined portion i5 by means of which the article holders and the articles sup ported thereon are lifted to a sufficiently high ele vation to clear the left end of the rust proo?ng tank 24 and allow the articles to be deposited therein, the maximum elevation of the inclined portions II and it of the double rail sections be ing located substantially directly above the left edge portion of the rust proo?ng solution tank. The double rail section 32 then continues substan tially horizontally‘ from the lower extremity of the downwardly inclined portion i5 thereof to a location substantially adjacent the right ex tremity of the rust proofing tank, or slightly in advance of the latter. Vertically ‘movable lengths of rails 34 are dis posed in alignment with the rails of the double ‘rail section 32 and located directly above the adjacent end portions of the rust proo?ng solu 70 tiontank“ andtherinsingtankZS. These vertically movable lengths -of rails 33 are sup ported by lifting apparatus to be hereinafter more fully described. Extending to the right, as viewed in Fig. 2, from the vertically movable lmgthsofrails3l.thedoublerailsection32is _ ' The conveyor chains 95 and associated sup 20 porting tracks 36 and sprocket wheels 31 are located on each side of the double rail section 32 in outwardly spaced relation to the rails thereof respectively, as illustrated in Figs. 1 and 7. Each sprocket wheel 31 is ?xed on a shaft 93 journalled 25 in suitable bearings carried by the frame struc~ ture 63 of the apparatus. Mounted on each shaft ' 33 is a sprocket gear 39 which is operatively con nected by a chain I00 to a sprocket gear ilil mounted on the transversely extending shaft 30 which, as previously set forth, is driven by the sprocket gears 33 and Si and interconnecting chain 32. The conveyor driving chains 95 are spaced apart sufficiently to accommodate the reception of the respectively opposite end portions of the bars 53 between alternate links thereof which have outwardly extending side plates I02 forv providing spaced recesses for the reception of the end portions of the bars 33. The links of the chains 35 are provided with rollers 35' which are disposed in rolling contact engagement with the tracks 33. The vane-like propelling elements 33 which move the article holders from the converging end portions 13 of the tracks of the double rail sec tion 32 are operated in timed relation to the con veyor driving chains 33 through the medium of the shaft 33 and they position the article holders substantially directly over the left hand extremity of the path of the conveyor driving chain 33 in position to be picked up by the latter chains and moved to the right, as viewed in Figs. '7 and 11, and up the inclined adjacent portion I 6 of the double rail section 32. The articles, il 55 lustrated at H in Fig. 2, carried by the article holders are in this way lifted over the left end wall of the rust proo?ng solution tank 23 and lowered thereinto as the conveyor driving chains 35 carry the article holders downwardly along the next adjacent portions ll of the double rail section 32. The chains 85 move the article hold ers to the right over the horizontal. portion of the double rail section until they approach the right end portion of the rust proo?ng solution 65 tank 24. At this location, the chains 35 move the article holders onto the vertically movable lengths of rails 34 by which they are lifted by suitable elevating mechanism to remove the arti cles thereon vertically from the tank. 70 The elevating mechanism for lifting the article holders vertically, illustrated in Figs. 12, 13 and 14, include a stationary mainframe structure having rectangularly spaced upright posts I33 and connecting horizontal beams I I4 and this 75 5 2,110,480 structure is preferably con?ned in a housing I05, shown in Fig. 2. Vertically movabiy mount ed. within the frame structure formed by the vertical posts I00 and horizontal beams I04 is a rectangular frame I05 on which the length of rails 04 ‘are rigidly ?xed. The frame I00 is con and lengths of rails 04 carried thereby, upwardly. The free ends of the chains IIO are each pro vided with a weight I00, by which the chain is maintained under tension. The control arm I 21 of the switch I20 is returned to its normal position by a spring (not shown) after the con ?ned to movement in a vertical course by spaced tacting article holder moves out of engagement vertically extending guide members I01, which therewith, but the valve mechanism remains in are ?xed to the horizontal beams. I04 of respec its aforesaid condition until altered in the man 10 tively opposite sides of the main frame structure and located substantially midway between the vertical posts I00 thereof, as illustrated in Fig. 14. Each guide member includes a pair of angle bars, having inwardly extending ?anges which 15 are received in a channel of an elongated bracket I08 carried by the frame I00, as shown in Fig. 12. Fixed to the opposite sides of the frame I00, adjacent the guide members I01, are trusses I00 ner hereinafter set forth. ‘ 10 During upward and downward movement of the article holders by the elevating mechanism, the ends of the tubular bar 00 are engaged be tween pairs of guide bars III and I02 respec tively. The pairs of guide bars III are mounted 15 on the main frame structure of the elevating mechanism and the space between their lower end portions is so located as to accommodate up ward movement of the bar 00 when the switch I20 is closed. The upper .end portions of the 20 guide bars IOI are inclined slightly in the di rection of movement of the article holders over disposed substantially parallel to the lengths of the double rail section 02 so as to shift the arti rails 04. The chains IIO extend laterally of the cle holders on the lengths of rails 04 somewhat in the direction of their desired travel and to 25 25 double rail section 02 and downwardly over the bring the end portions of the bar 00 into driv sprocket gears IIO which are ?xed on respective ing engagement with conveyor driving chains I00 ly opposite ends of a shaft II4 journalled in suit mounted on the main frame structure of the ele able bearings carried by the main frame struc ture. Mounted on the shaft “4, intermediate vator mechanism substantially at the upper ele 30 the end thereof, is a pinion II5 which is meshed vation of the vertical path of movement of the 30 with the teeth N0 of a rack II1 carried by a lengths of rails 04. Each chain I00 is endless and is disposed piston rod H0. The piston rod IIO has a piston ' II9 thereon slidably mounted in'a pneumatic around sprocket gears I04 and I00. The sprocket to each of which is secured a chain H0. The 20 chains I I0 extend over sprocket gears III mount ed on a shaft II2 which is journalled in suitable bearings carried by the main frame structure and cylinder I20, which is preferably located ‘adja 35 cent one side of the double rail section 02. The respectively opposite ends of the pneu matic cylinder I20 are connected by conduits I2I, I22 and valve mechanism I20 with a source of ?uid pressure (not shown) by a conduit I24, by 40 means of which the piston IIO, piston rod H0 and rack I I1 are reciprocated in a predetermined manner for the purpose of raising and lowering the frame I00 and the lengths of rails 04 carried thereby. 45 shaft I00 having one end portion which pro 35 trudes beyond the side of the double rail section on which is mounted a sprocket gear I01. The sprocket gear I01 may be operatively connected by a chain I00 with any desired prime mover or it may be driven by the driving mechanism of 40 the conveyor system in the manner illustrated in Fig. 2, wherein the chain I00 passes around the sprocket gear I00, which is ?xed to a shaft ' I0 journalled on the frame structure and pro ' The operation of the cylinder I20 and its pis ton IIO of the structure associated therewith is automatically controlled by apparatus which is responsive to movement of the article holders so as to individually lift each successive article 50 holder as the latter is disposed upon the verti cally movable lengths of rails 04 by the con veyor driving chain 05. gears I04 are ?xed on a transversely extending This apparatus in cludes a relay I25 mounted on the valve I20 and electrically connected with a switch I20 lo-, 55 cated on or in advance of one of the horizontal beams I04 of the frame structure of .the housing 21, as illustrated in Fig. 2. The switch I20 has a downwardly extending control arm I21 pro vided with a laterally extending ?nger I20 which vided with a sprocket gear I2 that is so construct ed and arranged as to be driven by one of the conveyor driving chains 00 of the double rail section 02. The sprocket gears I00 are carried by separate idler shafts I40, which are jour nalled in suitable bearings carried by the main 50 frame structure of the elevator mechanism. ' Re gardless of the source of power applied to the conveyor chains I00, they are preferably driven at a relatively high rate of speed so as to rapidly move the article holders to the right, as viewed 55 in Fig. 13, and both the upward and downward movements of the elevating apparatus are rapid so as to reduce, as far as possible, the period of 50 of the article holders. When the control arm I21 is actuated by engagement with an article time during which the articles are exposed to the atmosphere while they are being transferred 60 from the rust proo?ng solution tank 24 to the ?nal rinsing‘ tank 25. This precaution is taken to prevent drying and hardening of the rust holder, the valve mechanism I20 is operated, proo?ng solution on the article. 60 projects into the path of travel of the brackets 55 mounted on the side of the leading carriages 65 through the relay I25, to admit air to the lower I, As the article holders are moved to the right, as viewed in Figs. 12 and 10, by the chains I00, end of the cylinder I20, and the track sections 04 and the holder thereon is rapidly lifted ver the bracket 05 of the leading carriage 00 thereof, tieally by the elevating mechanism. engages a control arm I“ of an electric switch The air that is admitted to cylinder I20 forces the piston IIO, piston rod H0 and rack II1 upwardly so as to rotate the shaft “4 and sprocket gears I I0 thereon in a clockwise direction, as viewed in Fig. 14. This rotation of the sprocket gears IIO moves the chain IIO to the ‘right, as viewed in 75 Fig. 14, thereby pulling the elevator. frame I00 I42 which is also electrically connected with the relay I25 of the pneumatic control valve I20. 70 The switch I42 is so constructed and arranged as to close its circuit when the ends of one of the tubular bars 00 of the article holder are in ‘ registration with the space between the diverg ing end portions of the guide bars I02, so as to 75 ' 6 2,110,4ao return the pneumatic valve I23, through the me dium of the relay I25, to its previous position and to Jcondition it to admit fluid pressure to the upper end' portion of the cylinder I20 and to thereby force the piston Ill, piston rod H3 and rack Ill downwardly, as viewed in Fig. 14. This movement of the rack I ll causes the chain ill to be moved to the left. as viewed in Fig. 14, ment of the article holder throughout its course and which is substantially identical to the corre sponding apparatus shown in Fig. 8. The conveyor driving chain 33 then moves the article holder throughout the remaining portion of the mono-rail section 3|, past the unloading dock, where the treated articles are removed by attendants. Then the unloaded, article holders thereby permitting the frame IIS of the elevator are moved along their course by the chain 3! un 10 and lengths of rails 0| carried thereby, as well til they reach the loading dock, at which location 10 as the article holders, to be lowered. The down- " attendants place thereon other articles to be ward movement of the article holders is guid ed by the guide bars I32 which are located rela tively close together, so as to hold the bar 53 15 in substantially accurate transverse relationship with respect to the movement of the main con veyor driving chains 35 of the double rail sec tion 32. ' ~ When the article holder reaches its lowermost 20 position it is deposited on the conveyor driving chains 95 between the upstanding side plates I02 of alternate links thereof, and these con veyor chains then move the article holders through the rinse tank 25 and then upwardly 25 over the last inclined portion of the double rail section 32, so as to remove the articles carried by the holders from the rinsing tank 25. The conveyor driving chains 98 then move the arti cle holders and the articles thereon downwardly 30 over the ?nal right hand downwardly‘inclined portion of the double rail section 32 and through ‘ the drying chamber 38 which is heated by burn~ ers M3 to remove the rinse water carried by the articles. When the article holder reaches-a position over the extreme right hand sprocket gear 91 of the main double rail conveyor driving chain 95, it is disconnected from the driving chain and_moved downwardly under its own weight until it is en— 40 gaged by a yieldable stop I“ shown in Figs. 2 and 15, which is pivotally mounted on the upper wall of the discharge end of the housing 21 and yieldably held against counter-clockwise rota tion, as viewed in Fig. 2, by coil springs I45, each 45 attached at one end to the housing 21 and at its other end to the pivotally mounted stop. The stop I“ includes a pair of downwardly extending arms I46, each located adjacent one of the outer sides of the right end portion of the rails of the 50 double rail section 32. These arms engage the carriages of the article holder and retain the same at rest until the ?ange 56 of the bracket 55 of the leading carriage 50 of the article holder is again coupled with the conveyor driving chain 38 55 of the mono-rail sections 30 and 3| by engage ment of the ?ange 56 between the“ pivotally mounted latch plates 46 of one of the carriages 4i by which the chain 39 is supported from its track 38. When the leading carriage of the article hold or is again coupled with the driving chain 39, it is propelled thereby over a pivotally mounted rail portion 14’ corresponding to the pivotally mount ed rail portion 14, heretofore described. The 65 leading carriage 50 is, in this manner, engaged upon the rail 33 of the mono-rail section 3|. The treated. Throughout the foregoing description of the construction and apparatus of the improved con veying mechanism and rust proo?ng system, the progress of only one article holder has been out lined, but it should be understood that, as illus trated in dotted lines in Fig. l, a plurality of such article holders are arranged in relatively close proximity on the conveying apparatus, so as to 20 enable the convenient handling of a vast number of articles. . No manual movement of the article or article holders is required throughout theentire course of travel thereof, for all the changes in the manner 25 of movement of the article holders are brought about automatically by control mechanism which is responsive to movement of the articles at the diverse locations at which these changes in the manner of movement occur. The articles are 30 conveyed in a single ?le relationship through the preliminary washing station and through the next successive washing and rinsing stations in such an arrangement that enables them to be conveniently worked upon. The article holders 35 are moved in a multiple ?le relationship through the rust proo?ng solution tank by conveyor driving chains which may be operated at a slower rate of speed than the conveyor driving chain 39, which delivers the article and article holders to 40 the rust proo?ng unit and carries the same away from the latter, so as to subject the article to the action of the rust proo?ng solution for a pre determined length of time without requiring the use of excessively long rust proo?ng solution tanks and rinsing tanks, and without exposing a relatively large surface of rust proo?ng solution to the evaporating action of the atmosphere. Removal of the articles from the rust proo?ng solution tank and placement thereof in the rins 50 ing tank is rapidly accomplished in a relatively short interval of time by the automatic elevating and transferring mechanism, which, as hereto fore set forth, is operated at a relatively higher rate of speed than that of the main driving chains 55 ‘of the double rail section 32 and the mono-rail sections 3|! and 3!. The automatic operation of the switching apparatus by which the article holders are transferred to and from the double rail section 32 and the rapid acting elevating and 60 transferring devices by which the articles are re moved from the rust proo?ng tank and placed in the rinsing tank predetermines the interval of time required in which to accomplish these oper ations. 65 Inasmuch as the time required in which to ac pivotally mounted rail portion 14' is then rotated complish a satisfactory ?nal rinsing operation in a counter-clockwise direction, as viewed in is dependent more or less directly upon the ex Fig. l, to bring the free end thereof into regis 70 tration with the end portion of the rail of the double rail section upon which the other carriage 60 of the article holder has been supported. This operation is automatically accomplished by a pneumatic cylinder 16' and associated control mechanism, which is also responsive to move tent to which the rust proo?ng solution has dried upon the article during this transfer period, the 70 ?xing of the transfer period renders it possible for the length of the treatment of the articles in the rinsing tank to be accurately predetermined. The uniformity of the condition of the resulting product greatly facilitates the ?nishing thereof 75 7 9,116,480 in any subsequent treatment to which it is sub-”" jected, such as plating, painting or enameling treatment. Although but one speci?c embodiment of the double rail section in transversely extending rela tionship with respect to its direction of move ment through said other station, and apparatus‘ for automatically transferring said article holder invention has been described and illustrated‘ in - from one end of each rail section to the adja cent end of the other including control mem bers responsive to movement of said article holder as the latter approaches the adjacent ex detail, it will be apparent to those skilled in the art that various modi?cations may be made without departing from the scope of the appended claims. - tremities of said rail sections and including driv ing means intermediate adjacent ends of said 10 rail sections for propelling said article holder - What I claim is: 10 1. Apparatus for conveying articles throughout a predetermined substantially closed circuit course including an elongated support adapted to carry a plurality of aligned articles, means for movably supporting said support and con?ning the move ment thereof to said predetermined course in from one to the other thereof. 4. In apparatus for rust proo?ng articles in tion and a doublerall section included in series cluding a washing station and a spaced station comprising a rust proo?ng solution tank; appa 15 ratus for conveying articles through a substan tially closed circuit course and through said sta tions including a system of rails having a mono therein, ‘apparatus for automatically switching rail section associated with said washing station cluding a system of rails having a mono-rail sec and a double rail section associated with said rust 20 proo?ng station, said mono and double rail sec 20 said article support from ‘said mono-rail section to one end of said double rail section and from the opposite end of said double rail section back to said mono-rail section including control mecha tions having their respectively opposite end por tions associated with each other for completing said course, an elongated article holder movably nism operable by engagement with said article mounted on said system of rails and adapted to 25 support a plurality of articles to be treated in 25 support during‘ movement thereof ‘toward and away from the opposite ends of said double rail section respectively, and apparatus for driving longitudinal alignment thereon, said article hold er being movable in the direction of itslength said article support throughout said predeter through said washing station while supported on mined course including driving members associ 30 ated with said mono-rail section and said double rail section respectively and including a driving member at the junction of one end of said double rail section and said mono-rail section for driv ingly transferring said article supports from‘ said mono-rail section to said double rail section. said mono-rail section and being movable in a 30 direction transverse to its length through said tank while supported on said double rail section, and transfer means including propeller apparatus for drivingly moving said article holders from said mono-rail section to the adjacent end of said 35 double rail section and including means respon 2. Apparatus for conveying articles throughout sive to movement of said article holder toward _ a predetermined substantially closed circuit course 40 including an elongated support’ adapted to carry the adjacent extremities of said rail sections for a plurality of aligned articles, means for movably automatically switching said‘article holder from supporting said support and confining the move said mono—rail section to said double rail section 40 and’from the latter, back to said mono-rail sec ment thereof to said predetermined course includ ing a system of rails having an intermediate dou- ' with ends thereof, apparatus for automatically nally extending relationship with respect to one of said mono-rail sectionsto a transversely e‘x-> tending relationship‘ with respect to said double rail section,>and apparatus for driving said ar ticle support throughout ‘said predetermined course including driving members'associated with each of said rail sections respectively and a driv ing member at'the junction of one end of said double rail section and said mono-rail section for transferring‘ said article support to said ‘double ‘ _ ‘ , ' 3. In apparatus for treating articles including spaced article treating ‘ stations; apparatus for " ‘ ' mono-rail section and associated with said rust 50 proo?ng station, said mono-rail section‘ having an endless continuously driven'_conveyor extending along both portions thereof and by-passing said double rail ‘section, an elongated article holder movably mounted on said system of rails and 55 adapted to support-a plurality of articles to be treated in‘longitudinal alignment thereon. said article holder being movable in‘the direction of its length through said washing ‘station while sup ported on said mono-railisection and being‘m'ov 60 conveying articles through a‘substantially ‘closed ' able in a direction transverse to its length through circuit course and through‘ said stations including an elongated articlev holder adapted to support a plurality of“ articles to be treated in‘longitu'dinal said tank while supported on said double rail sec 65 alignment thereon, ‘a system of ‘rails including a mono-railsection in related proximity to one‘ of said stations and a double rail‘s‘ection in related proximity to ;_ another ‘station, said double rail section‘ being included in series betweén'e‘nd por tions vof said mono-rail section, means for move I ably supporting‘ said article holder _‘on"said v'i'nono-' rail ‘section in lengthwise extending ‘relationship 75 ' a double rail section between portions of said . rail section and back to a longitudinally extend 50 ing relationship with respect‘ to the other mono— section. " comprising a rustproo?ng solution tank; appa 45 ratus for conveying articles through said stations including‘ a system of rails ‘having av mono-rail section associated with said ‘washing station and 45 switching, said article support from a longitudi rail tion. 5. In apparatus for rust proo?ng articles in— cluding a' washing station and ‘a spaced station ble rail section and mono-rail sections associated tion, means forlmovi‘ng said article holder while articles supported‘ thereon" are immersed in‘ said tank, means for lifting said, article ‘holder on» 65 stantially vertically-Pout of said tank when it reaches a predetermined position therein. and means for propelling‘ said article‘holders‘whilein , said lifted position‘ ‘away’from saidtank. _ *6‘. Conveying ‘apparatusincludin‘g ‘a system of 70 rails'having aid‘jacent‘mond-jrail and‘ double ‘rail ‘ ‘ sections, an article holder‘ including longitudinally with respect to its direction of movement through spaced supports ‘engageable‘ on said‘ rail sections, one ‘of said stations',-said'means‘being adapted said double raiisection‘ having a‘p'ainof com to mtvably?'supirort said‘ article'holder in‘ (said verging rail portions ‘adjacent said‘ mono-‘rail 75 8 “ sections and said mono-rail section having a pivoted rail portion 'registerable with each of said converging rail portions, apparatus for automati cally controlling said pivoted rail portion having a control member responsive to movement 0! said article holder relative thereto and adapted to move said pivoted rail portion from a registering relationship with respect to one of said converg ing rail portions to a registering relationship with 10 respect to other of said converging rail portions after movement of each of the supports oi.’ said article holder respectively beyond said pivoted rail portion, and mechanism for propelling said article holder including a driving‘ member associated ll with each of said rail sections respectively and an intermediate driving member at the Junction of said rail sections for removing said article holder from engagement with the driving member of one of said rail sections and bringing the same into engagement with the driving member 01' the other rail section. 7. Conveying apparatus including a system of rails having adjacent mono-rail and double rail sections, an article holder including longitudinally spaced supports engageable on said rail sections, said double rail section having a pair of converg ing rail portions adjacent said mono-rail sections and said mono-rail section having a pivoted rail portion registerable with each of said converging rail portions, apparatus for automatically con trolling said pivoted rail portion having a control member responsive to movement of said article holder relative thereto and adapted to move said aligned with said ?rst mentioned rail sections. an article holder movable on said rail sections, ‘mechanism for automatically elevating said in termediate rail section when said article holder is disposed thereon and located at the end oi one oi.’ said receptacles, apparatus for actuating said mechanism to automatically lower said inter mediate rail section when-said article holder is directly above the other receptacle, and an inter mediate propelling member operable while said 10 intermediate rail section is elevated for bringing said article over. the latter receptacle. 10. In apparatus for subjecting an article to successive treatments including a pair of adja cent receptacles, each having an open upper ex tremity, apparatus for conveying articles through 15 said vreceptacles including a pair of spaced aligned rail sections, each extending over one of said re ceptacles respectively, an intermediate vertically shiitable rail section disposed over the adjacent 20 end portions 0! said receptacles and normally aligned ‘with said ?rst mentioned rail sections, an article holder movable on said rail sections, mechanism for automatically elevating said in termediate rail section when said article holder is disposed thereon and located at the end of one of said receptacles, apparatus for actuating said mechanism to automatically lower said inter mediate rail section when said article holder is directly above the other receptacle, an inter mediate propelling member operable while said intermediate rail section is elevated for bringing said article over the latter receptacle, spaced pro pelling members for moving said article holder pivoted rail portion from a registering relation ship with respect to one of said converging rail portions to a registering relationship with respect to the other oi said converging rail portions alter movement 01’ each of the supports of said article holder respectively beyond said pivoted rail por tion, mechanism for propelling said article holder including a driving member associated with each 01' said-rail sections respectively and an inter mediate driving member at the junction 0! said rail sections for removing said article holder from engagement with the driving member of one of move said article holders slowly through said receptacles and at a faster rate during movement thereof from a position above one receptacle to a position above the other. 11. In rust proo?ng apparatim including a rust said rail sections and bringing the same into engagement with the driving member of the other proo?ng solution tank and an adjacent rinsing tank, apparatus for conveying articlm through A rail section, and a system of operating members saidtanksincludinga?xedrailsection extending interconnecting said driving members for op proo?ng solution tank and an adjacent rinsing tank, apparatus for conveying articles through over each of said tanks, a vertically movable in termediate rail section extending over the adja cent end portions of said tanks and aligned with said ?rst mentioned rail sections, article holders movable longitudinally oi’ said rail sections, and said tanks including a ?xed rail section extend ing over each of said tanks, a vertically movable intermediate rail section extending over the ad said intermediate rail sections when an article 55 holder is disposed thereon including a control erating the latter in a predetermined relation. 8. In rust proo?ng apparatus including a rust jacent end portions of said tanks and aligned with said ?rst mentioned rail sections, an article holder movable longitudinally oi’ said rail sections, means located at the upper limit of movement of said intermediate rail section for moving said over said ?rst mentioned rail sections and through the main portions 0! the lengths of said receptacles, and‘ driving mechanism including driving members associated with said propelling means and said elevating mechanism, said mem bers being so constructed and arranged as to apparatus for automatically lifting and lowering member remote from said rust proo?ng solution tank and responsive to movement 0! an article holder located rearwardly oi the article holder disposed on said intermediate rail section for lifting the latter and including a control member article holder from a position directly above said responsive to movement of an article holder on rust proo?ng solution tank to aposition' directly said intermediate rail section when the latter is above said rinsing tank, and apparatus for auto matically elevating said intermediate rail section when said article holder is disposed thereon. mediate rail section. 12. In rust proo?ng apparatus including a rust ' 9. In apparatus for subjecting an article‘ to successive treatments including a pair of adjacent receptacles, each having an open upper extremity, 70 apparatus for conveying articles thmughsaid re ceptacles including a pair of spaced rail sections, each extending over one foi said re ceptacles, respectively, an intermediate vertically shiitable rail section disposed over the adjacent 76 end portions of said receptacle and normally in its elevated position for lowering said inter proo?ng solution tank and an adjacent rinsing tank, apparatus for conveying articles through said tanks including a ?xed rail section extending over each oi’ said tanks, a vertically movable in~ 70 termediate rail section extending over the adja cent end portions of said tanks and aligned with said ?rst mentioned rail sections, article holders movable longitudinally of said rail sections, and apparatus for automatically lifting and lowering 75 I 2,116,480 said intermediate rail section when an article holder is disposed thereon including lilting and 9 shlitable conveyor section disposed over said ex tremity of said ‘receptacle for receiving articles ~ lowering control members respectively arranged _ delivered thereto by said ?rst conveyor section. in sequence at a location rearwardly oi the rust , mechanism‘ for elevating and lowering said shift proo?ng solutionvtank and operable by engage ment with an article holder spaced rearwardly from the holder disposed in said intermediate rail , section. 13. in rust proo?ng apparatus including a rust solution tank and an adjacent rinsing '10 proo?ng tank, apparatus for conveying articles through said tanks including a ?xed rail section extend ing over each oi.’ said tanks, a vertically movable ' intermediate rail section extending over the ad 15 jacent end portions of said tanks and aligned with said firstv mentioned rail sections, means located at the upper limit of movement of said intermedi ate rail section for moving said article holders irom a position directly above one tank to a po 20 sition directly above the other, article holders movable longitudinally of said rail sections, and ‘apparatus for automatically lifting and lowering ‘ said intermediate rail sections when an article holder is disposed thereon including a control t member remote from said rust proo?ng solution tank ‘and responsive to movement of an article holder located rearwardly of the article holder disposed on said intermediate rail section for op . crating said lifting and lowering apparatus to lift 30 said intermediate rail section and including a sec ond control member responsive to movement, of an article holder by said means for operating said lifting and lowering apparatus to lower said in termediate rail section when an article holder . ‘ thereon is in a predetermined position. 14. Conveying apparatus including a ?xed rail section, a vertically movable rail section aligned with said ?xed rail section and movable between upper and lower limits, a member movable lon 40 gitudinally of said rail sections, means for mov ing said member along said ?xed rail section and over a portion of said movable rail section when .the latter is at its lower limit; means located in proximity to the upper limit of said vertically movable rail section for reflecting movement of able conveyor section, mechanism located in prox imity to said shiitable conveyor section for mov ing articles onthe latter away from said extrem ity of said receptacle when said shiitable con veyor section is at its upper limit, and automatic control means responsive to movement oi.’ an are 10 t-cle to a predetermined position on mid verti cally shiftable conveyor section for actuating said lifting and lowering mechanism to lift said arti cle, said control means being responsive to subse» quent movement of said article to a di?erent pre determined position on said vertically shiitable conveyor section for lowering said article. 16. In apparatus for subjecting an article to treatment in a receptacle having an open extrem ity, a ?xed conveyor section for moving articles 20 through said receptacle transversely of- said open extremity toward an end wall thereof, a movable conveyor section shiftable toward and away from said open extremity for receiving articles deliv ered thereto by said ?xed conveyor section and 25 extending over said end wall, mechanism ior au tomatically moving said shiftable conveyor sec tion toward and away from said open extremity including control means operable when an article is deposited in a predetermined position on said shiftable conveyor section for moving said article away from said open extremity, and a propelling w member operable while said shiftable conveyor section is remote from said open extremity for moving said article out of registration with said 35 receptacle, said mechanism including automatic control means operable when saidarticle is dis posed in a second predetermined position for mov ing said shiftable conveyor section toward said open extremity.. 1'?- Conveying apparatus including a ?xed rail section, a vertically movable rail section inter posed between portions of said ?xed rail section and movable between a lower position substan tially aligned with said ?xed rail section and an 45 said member over only a portion of the length ' upper portion spaced therefrom, a member mov thereof when said movable rail section is at said able longitudinally of said rail sections, means for moving said member along said ?xed rail sec upper limit-apparatus tor automatically elevat ing said movable rail section when said member is ~ tion and along opposite end portions or said mov disposed in predetermined position thereon, and able rail section when the latter is in its lower po sition, means located in proximity to the upper apparatus 101' automatically lowering said mov portion oi! said movable rail section for moving able rail section when said member is in a dif said member along the intermediate portions of ierent predetermined position thereon. ‘ 15. In apparatus for subjecting an article to said movable rail section when the latter is in‘ ' treatment in a receptacle having an open upper its upper position, and apparatus for reciprocat extremity, a. conveyor section substantially ?xed ing said movable rail section intermittently be in elevation ‘for moving articles throughv said re - tween said upper and lower positions. ceptacie toward one extremity thee-coda vertically ROBERT E. GORDON.