Патент USA US2133580код для вставки
- Oct. 18, 1938.\ I ' ’ D. F‘. sEARLE ’ AIR BRAKE ' 2,133,580 SYSTEM ' Filed July 19', 1937 - FIG. I. FIG. 2[ v22 A INVENTOR: DUDLEY _ F. BY- 2 SEARLE , - 2r lér% , [ATTORNEY Home... 18,1938’ r - v A I ' ; _ 2,133,580 ‘UNITED STATES, PATENT OFFICE .. . I, , . , . 2,133,580 , .l , g , ._ ‘ AIR BRAKE sxs'rarr Dudley F.‘ Seal-1e, omens, cam. Application -5 ‘July Claims. 19, 1931, (01.‘ abs-5o) serieino.1‘ 154,469 inventionyrelates to improvements in air 3 “Fig, '1‘ is a diagrammatic view of-acontrol valve T‘ brake systems, ‘and more partlcularlytogradu-H ' a, constructed in accordance with this invention ,atingcontrol valves therefor. ‘ > v‘ , ~ shown. in plan view connected to the essential Among the‘objects ofthis-inventiop‘is to pro- ‘elements of a; conventional vacuum air brake 5 vide a control valve which will automatically vsystem which is shown in side elevation. , 5 ' maintain the brake power chamber ata constant ' Fig. 2 is an enlarged. vertical section taken pressure so that the brakes can be held applied: along the line II—II_in Fig. 1 of the control valve.v tov any desired extent without variation for- a I : Fig.3 is a horizontal section taken alongthe , prolonged period. 10 line IIIV—’III in Fig. 2 and showing the valvein ._ Another object is to renderjthe control valve an operating position. Q ~ - 10 capable of maintaining various pressures'in the 1 Fig. i is’a similar viewlof the same in the posi v, brake to thechamber distancewhich that the areaccurately control valve proportional is vmoved- _tion Fig. for5 full is. a application detail view of in the, sidebrakes. 7elevation‘of the .i from» neutral position. 1 15 , » ‘ ‘ valve plug showingthe tapered pressure control Another object is to provide a graduating con-V ._ groove.‘ trolvalve which will automatically, maintain any . desired. pressure throughout the range from zero - l5 - ‘n detail, the construction illustrated in the drawing comprises the valve body I secured. to a pressuretothe maximum pressure obtainable.‘ . _ , suitable support 2 by the‘ screws 3 asin 13713-1. It Anotherobje'ct is toprovide unrestricted com- has the central opening 4 therethroug'h‘ which‘ ‘ 20- munication between the brake chamber and the pressure source for emergency operation of the brakes. . , tapers toward its upper end. The bosses! and I 20 extend from opposite sides of the valvebody and ~ are internally threaded. ‘Another object is to provide a valve of simple The pipe V is screwed into the boss 5 and leads construction, inexpensive of , manufacture, and to vasource of sub-atmospheric air pressure’sueh zo?permanently reliable in‘operation. - as the intake motor manifold; 8 of an‘ internal 25 . In prior valves of the present type, tapered combustion motor.. The pipe C is similarly con- - groovesv were provided which cooperated with nected to the boss 6 and communicates with the boththe pressure supply port. and the atmos- brake power chamber vIt) havingthe usual dia phelv‘ic DQIt- The brake chamber port was thus in _ phragm ll therein.’ 'I'he‘ports l2 and I3 provide 30, communication with boththe atmosphere and . communication between the central opening I 30 the source of pressure 'to a variable extent. The . and the pipes V vand C respectively. :The ports existence of two variable quantities rendered it . intersect the opening I at substantially 120 de . dif?cult to design prior valves so that the pres- 1 grees from each other. , . , . . sure maintained in.the brake chamber would be I. The port It is providedinthe-opposite side of 35. accurately proportional to the extent of the move- ‘the opening 4 substantially‘equidistant from the 35 ment of the control valve. ‘ It has been found, in ports I! and i3. It communicates with the pas practice; in thecase of sub-atmospheric pres- sage Awhich leads to the atmosphere through sure brakes for motor vehicles, that under this . the bottom of the body I. Anairlcleaner is pro v , teaching of th8"l)1'i01‘,B_-I‘t,1,t is impossible to maing 40 min a brake cylinder pressure in the range be~ tween eight and twenty inches of vacuum . vided for the air entering the passage l5.- vIt ~ consists of theperforated cup l6 secured to the 40 Broadly stated, the present invention consists, in part, of providing a tapered channel for coop- bottom of the valve body-and containing the ?brous filtering material II. The perforated disk ' l8 retains the: material II» in place within the erating with the pressure port of a control valve, cup [6, '45.,a'nd a groove of constant cross-sectional area for' . > , ~ ' The tapered valve plug I9 is a smooth sliding 45 -~ ‘cooperating with the atmospheric port. ?t within‘the opening “4.. It has the stem 20 pro _ , Other objects and advantages appear as this T‘ descriptionprogresses. ‘ . In .the specification I and the accompanying‘ jecting upwardly therefrom. The manual oper ating handle 2| has its hubv 22 ?xed on the stem 20‘ by. means of the transversepin 23. The handle 50, drawing, the invention is disclosed in its pre- _ 2| may have a conventional friction pawl (not 50 ferred form. It is, however, tobeunderstood that shown) cooperating with the notches 24, pro the invention is not limited to this form because vlded' on the body i, see, Fig. ,1}, to retain the , modifications may be made within the purview handle in the position to whichit is moved by the of the claims following the description. 55, In the oneshe'etof drawings: operator. ' _ - V _ , , i .The bottom of the hub 22 has the annular 55 2. 2,188,580 .. groove 2| therein. The marcel spring 26 con?ned , handle II to the'extreme left. The plug I I then in this groove expands against the top of the body assumes the position shown in Fig. 2. The por ' I and draws the tapered plug l9 into‘ ?rm en tion :33 covers the port I! thus closing 08 all gagement with the'walls o! the opening ‘4.; communication to the intake manifold I. Free The plug ‘I! has the chordal recess 21‘ therein communication from‘ the atmosphere to the which is substantially ot the same cross sec chamber Ill‘is provided by the recess 21. "This . tional area as the ports l2, I3, and I4. When “fully releases the brakes with rapidity. the valve is in neutral position, the recess 21 reg It will be‘ obvious to those skilled in the art that isters with the ports ll and it which communi the tapered channel I. and the groove I! of 10 cate with the chamber I0 and the atmosphere constant cross sectional areas could be transposed respectively. The channel I. in the side of the plug ll extends from the recess 21 in a‘counter clockwise direction and diminishes in both width and depth until it vanishes at a point near the -> is passage H, see Figs. 3 and 5. The groove 12 is of without a?ecting the operation of the valve. Having'thus described the invention‘, what is claimed and desired to be secured by Letters‘ Patent is: . . '1. In an air brake system having a source of uniform width and depth and extends- from the ‘ pressure and a power chamber therein; a control . ‘slot 21 in a clockwise direction and cooperates _ valve body having three ports therein leading to with the passage Il,_see Fig. 3. v ' , The apparatus operates substantially as fol 20 lows:. When the valve is in neutral position as shown in Fig. 2, the chamber II is maintained at atmospheric pressure "by air being free to ?ow from the atmospheric duct A, through the recess 21 registering'with the ports I I andv ll, into the ‘ pipe’ C leadinglto the chamber. said pressure source, said chamber, and the at mosphere respectively; and a movable valve mem -ber adapted to cooperate with said ports and having a neutral and intermediate andextreme operative positions, said valve member having a recess therein adapted to provide unrestricted communication between the power chamber port and the atmospheric port respectively when said, 25 ‘ To apply the brakes the handle 21 is manually ‘ moved to the right a distance depending upon the extent“ of brake application desired. This rotates the‘ plug I 9 in a counterclockwise direc '30 tion. The recess 21 passes out of’ registry'with valve member is in said neutral position, said valve member having a greatly restricted groove therein adapted to provide ‘communication be tween vsaid atmospheric’ and said chamber‘ port when said valve member is in an intermediate the port II. ‘The port It, however, remains in ' operative position and a second restricted groove communication with the port II through the re arranged to be out’of registry with said pressure stricted groove 32. The‘ end of they channel ‘I0 port when said valve member is in the neutral position but being brought into registry there moves into registry with the port i2. Air ?ows at a‘limited rate from the port ll, with when said valve member is moved to an 35 intermediate operative position, said valve mem past the restriction at 3| into the intake mani ber being arranged to bring the recess into a told I.‘ The reduced pressure in the recess 21 position to provide unrestricted communication causes air to ?ow thereinto from ‘the atmos phere through the‘ tapered channel 32. The between said pressure source port and said cham recess 21' then reaches an equilibrium pressure ber port when said valve member‘ is in: the ex! which depends upon the relative sizes of the air treme operative position. ' ‘ passages a?orded to the manifold 8, ‘past the restriction 30, and from the atmosphere over the taperedchannel 32. The pressure in the power .45 chamber It falls until it equals the equilibrium ‘ pressure. in the recess 21. It then remains‘ con stant. .The brakes are thus applied and held applied to a constant extent. ' ‘ This equilibrium pressure may 'be raised or 5,, lowered by moving the handle 21 to the-right or 2. In an air brake system having a source of sub-‘atmospheric pressure and a power‘ chamber therein; a control valve body having three ports ' therein connected to said pressure source, said 46 chamber, and the atmosphere respectively; and a movable valve member adapted to cooperate with said ports and having neutral and operative posi tions, said valve member having'a recess'therein left respectively. This rotates‘the tapered chan ‘nel In with respect to the port ‘l2 thus either increasing or decreasing the size of the air pas adapted vto provide unrestricted communication between said atmospheric and chamber ports when said valve member is in said neutral posi tion, said valve member having a restricted sage therethrough with‘ respect to the constant groove therein of constant cross sectional area 55 size of the opening‘ through the groove 32. The ‘ ‘and adapted to provide communication between groove 32 of ~ constant cross‘ sectional area .saidatmospheric port and said chamber port throughout renders it possible to arrange the » respectively when said vvalve member is moved dimensions of the single tapered slot 30 to provide ‘out of said ‘neutral position, said valve member ‘ for accurate control of the brakes throughout, the also having a tapered channel therein arranged full range of'operating pressures desired: - so as to be out of registry with said pressure port To apply the brakes fully, the handle 2| is when said valve member is in the neutral position moved to the extreme right. This moves the and adapted to provide progressively less re plug 19 into the position shown in Fig. 4, with the stricted communication between said pressure recess 21 registering vwith both the port II and source port and said chamber port when, said valve member is moved from neutral position. 785 the port i2. The groove 32 passes out of reg- 'istry with the port It. This cuts or: the power chamber ill from communication with the at mosphere. The recess 21 provides’ unrestricted . communication between the power chamber Ill 3. In an air brake system ‘having a source of subatmospheric pressure and a power chamber therein; a control valve body having three ports therein connected to said pressure source, said 70 and the manifold 8., The pressure in the cham chamber, and the atmosphere respectively; a 70 ber l0 immediately fallsto the subatmospheric valve member adapted to‘ cooperate with said pressure in the manifold, rapidly applying the ports and having a neutral and an extreme op brakes. to their fullest extent‘as required in emer gency operation. The brakes are released by simply moving the erative position; said valve member havig a re— cess therein adapted to provide unrestricted com munication between said atmospheric and cham 75 3 2,188,680 ber Ports when said valve member is in said neutral position, said valve member having a restricted groove therein of constant cross sec tional area adapted to provide communication between said atmospheric and chamber ports re spectively when said valve member is moved out of said neutral position, said valve member also having a tapered channel arranged so [as to be out oi! registry with said pressure port ‘when 10 said valve member is in said neutral position and adapted to provide communication between said pressure port and said chamber port when said valve member is in positions intermediate said neutral and said extreme operative position, said 15 larger recess being arranged to provide unre stricted communication between said pressure source port and said chamber port when ‘said valve member is in said extreme operative posi tion. . 4. In an air brake system having a source oi’ pressure and a power chamber therein; a con trol valve body having three ports therein leading to said pressure source, said chamber, and the atmosphere respectively; and a movable valve member adapted to cooperate with said ports and valve member-also having a channel therein ta pered in both width and depth arranged‘ so as to be out of registry with said pressure port when said valve member is‘ in the neutral position and adapted to be brought into registry with said pressure source port when said'valve member is in an operative position. 5. In air air brake system having a source of sub-atmospheric pressure and a power chamber therein; a control valve body having an opening 10 therein with three ports intersecting said open ing and connected to said pressure source, said chamber, and the atmosphere respectively; and f a plug member rotatable within said opening and , \ ~ having a neutral and a variable operative posi 15 tion, said plug member having a restricted groove therein of constant cross sectional area adapted to provide communication between the ports con; nected with the atmosphere and said chamber respectively when said plug member is rotated out 20 of said neutral position, said plug member hav ing a larger recess therein adapted to provide communication between said atmospheric ‘and said chamber ports when said plug member is in the neutral position, said plug member also hav 26 having neutral and operative positions, said valve ing a tapered channel arranged so as to be out member being arranged to provide communica of registry with said pressure port when said plug tion between said atmospheric and chamber ports ~ member is in the neutral position and adapted to when said valve member is in ‘said neutral posi provide progressively greater communication be tion, said valve member having a restricted groove therein adapted to provide communica tion between said atmospheric port and said chamber port respectively when said valve mem ' ber is moved into an operative position, said tween said pressure source port and said cham 80 ber port the farther said plug member is rotated from said neutral position. ' DUDLEY F. SEAFLE.