US2076769A - Buffing mechanism - Google Patents

Description

April 13, 1937. E. DENTLER 2,076,769

BUFFING MECHANISM Filled NOV. 29, 1935 2 SheelbS--Shee l Fig .e

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ry/4,157 @Lb/zig@ -April 13, 1937. A. E. DENTLER BUFFING MECHANISM Filed Nov. 29, 1935 2 Sheets-Sheet 2 Patented Apr. 13, 1937 BUFFING MECHANISM Arnold E. Dentler, Hinsdale, lll., assignor to W. tion of Delaware H. Miner, Inc., Chicago, Ill., a corpora- Appucauon Ndvember 29, 1935, serial No. 52,215

1l Claims.

'I'his invention relates to improvements in builing mechanisms.

This application is a continuation in part of my copending application, Serial Number 42,729,

filed September 30, 1935.

An object of the invention is to provide a buiiing mechanism having preliminary free spring action to absorb the lighter shocks, followed by relatively high frictional resistance to take care of the heavier shocks.

Another object of the invention is to provide a friction buffer having preliminary free spring action and limited free spring' capacity combined with means for producing high frictional resistance to absorb the heavier shocks, wherein the high frictional resistance .is produced by spring resisted wedge friction means cooperating with a friction shell or casing, wherein the preliminary free spring action is produced by the 2 spring resistance means only of the friction mechanism by the action of the pressure transmitting means cooperating with part only of the spring resistance, and wherein the free spring capacity is limited by bringing the pressure transgg, mitting means into direct actuating relation with the friction shock absorbing means.

Other objects of the invention will more clearly appear from the description and claims hereinafter following.

In the drawings forming a part of this speciication, Figure 1 is a fragmentary, vertical, longitudinal sectional view of the end platform of a railway car, illustrating my improvements in builing mechanisms in connection therewith. 35 Figure 2 is a longitudinal, sectional view through the builing mechanism of Figure l, said section being taken on two intersecting planes at an angle to each other and corresponding substantially to the angular line 2 2 of Figure 3. Fig- 40 ure 9 is a rear elevational view of the mechanism shown in Figure 2, said view being on the line 3 3 of Figure 2. Figures 4, 5, and 6 are vertical sectional views, corresponding respectively to the lines 4 4, 5 5, and 6 6 of Figure 2.

45 Figure '7 is a front, elevational view of the mechanism shown in Figure 2. Figure 8 is a broken, side elevational view of the mechanism shown in Figure 7, corresponding substantially to the line 9 8 of said gure. Figure 9 is a horizontal, sec- 50 tional view, corresponding substantially to the line 9 9 of Figure 8. Figure 10 is a view similar to Figure 2, illustrating another embodiment of the invention, the section in Figure 10 corresponding substantially to the line Ill-i0 of Fig- 5" ure 11. Figure l1 is a vertical, sectional view,

corresponding substantially to the line lI-II ol' Figure 10. In said drawings, I0 indicates a portion of the underframing of a. passenger car end platform, having a pocket I I adapted to receive the bumng mechanism, which is indicated by l2. The bui!- ing mechanism i2 is actuated by the usual longitudinally slidable center stem I2, which is guided in suitable openings of the underframe structure and cooperates with the usual movable end platform member I4. As is well understood by those skilled in this art, the end platform A member i4 is moved inwardly upon receiving buiiing shocks, thereby forcing the stem I3 inwardly also, and compressing the bumng mech` 15 anism I2 against the rear wall of the pocket Il.

Referring first to the embodiment of the invention illustrated in Figures l to 9 inclusive, my improved bufng mechanism proper comprises broadly a housing or friction casing A; a wedge B; three friction shoes C, C, and C; a pressure transmitting member D; a. spring abutment E; spring resistance means F; and a retaining member G for holding the parts assem- 1 bled.

The casing A isin the form of a cylinder of substantially hexagonal eros-section, as clearly shown in Figures 3 to 6 inclusive. The front end of the casing A, or the left hand end, as viewed in Figure 2, has the walls thereof thickened, as indicated at 20, said thickened wall sections being interiorly screw threaded. as indieatedat 2l,

to detachably and adjustably receive the retainhaving a reduced stem portion which extends through the opening 29 of the rear wall 22 of the casing A and projects beyond the rear end of said casing. The wedge -block B is provided with three wedge faces 26-26-26, which cooperate with the friction shoes C, C, and C. 'l'.'he outerv end of the stem 25 of the'wedge is adapted to bear on the vertical rear wall of the pocket ll of the underframing l0 of the car. I'he reduced stem 25 of the wedge B provides a stop shoulder 21 at the inner end thereof, which is substantially continuous around the wedge and adapted to engage the rear wall 22 of the casing A to limit to said casing.

'I'he friction shoes C, which are three in number, have V-shaped exterior friction surfaces 23, which cooperate with the friction surfaces 24 of the casing. Each shoe is laterally, inwardly enlarged, as indicated at 23, said enlarged portion y being provided with a wedge face 3|). whichcooperates with the corresponding wedge face 23 of the Wedge block B. 'Ihe enlarged portions of the friction shoes present spring abutment shoulders 3I-3l-3i, which are adapted to cooperate with one ofthe members of the spring resistance F.

'I'he pressure transmitting member D is in the form of a thimble having an annularfstop flange 32 at the inner end thereof, which cooperates with the retaining member G, as hereinafter pointed out. At the outer end, the thimble of the pressure transmitting member D is provided with a platelike follower section 33 which is iixed to the closed end of the thimble -by a dovetail joint 3l and is further welded to said thimble, as indicated at 35. The follower plate 33 of the pressuretransmitting member is adapted to be. engaged by the sliding stem I3 of the buiiing mechanism during the operation oi'y the device.

'I'he spring abutment E is in the form of a substantially cylindrical sleeve having an inturned flange atthe right hand end, as viewed in Figure 2, said flange forming an end wall 33, provided with a central opening 31. The wall 33 of said sleeve forms an abutment for the outer coil of the spring resistance F. As most clearly shown in Figure 2, the spring abutment E is held against outward movement by the retaining member G on which it is seated.

The spring resistance F comprises an inner,

relatively light vcoil 33 and a heavier outer coilv vof the pressure transmitting member D. The

opposite ends of the coil 33 bearon the front wall of the thimble of the member D and on the shoulders 3I-3I3| of the friction shoes C, C, and C.

I The coil 39 of the rspring resistance F has its opposite ends bearing respectively on the friction shoes C, C, and C and the ange 33 of the spring abutment sleeve E. 'I'he parts are preferably so proportioned that in assembled relation, the spring 39 is held under initial compression be, tween the shoes C, C, and C and the spring abutment E, and that the spring 33 is held under initial compression between said shoes and the pressure transmitting member D.

'I'he retaining means G is in the form of a ring which surrounds the thimble portion'of the pressure transmitting member D and has exterior screw threads 43,' which are engaged with the threads 2| of the thickened wall section 23 of the casing A. The retaining ring G has shouldered engagement with the flange 32 of the pressure transmitting element D, thereby limitingw outward movement of the wedge outwardly with respect the pressure transmitting member D will engage the front end of the -casing A when the rear end of the thimble section of the pressure transmitting member comes into engagement with the flange 33 of the spring abutment E.

In assembling the mechanism, the parts are inserted through the open left hand end of the casing, as viewed in Figure 2, while the screw` ring G is detached from said casing. I'he wedge B, the three friction shoes C, C, and C, together with the springs 33 and 33 and the abutment sleeve E are first inserted through the left hand end of the casing. The pressure transmitting member is then telescoped over the outer end of the coil spring 33 and the screw ring threaded into the opening of the casing A and adjusted to the proper position'to hold the parts assembled and provide the required overall length of the gear. The platelike follower section 33 of the pressure transmitting member D is thensecured to the thimble by engaging the cooperating parts of the dovetail Joint 34 with eachother and welding the plate 33 to the thimble, as indicated at 33 in Figures 8 and 9. The parts ofthe gear may also be assembled by vfirst placing the wedge B, the friction shoes C, C. and C, the springs 33 and 33,'and the sleeve E within the casing Av and then applying the pressure transmitting member D with the "screw ring G assembled` in Figures i to 9 inclusive is as follows: Upon inward movement of the buiiing stem I3, the pressure transmitting member D is forced inwardly of the casing A while the wedge is held against rearwardl movement byv engagement of the vertical rear wail of the pocket Il of the underframe structure I3. The spring 33 will thus alonebe compressed between the pressure transmitting member and the friction shoes, the friction shoes at this time remaining stationary due to the high frictional resistance existing between the friction surfaces thereof and the casing. The compression of the spring 33 continues until the pressure transmitting member D has been moved inwardly a sufiicientdistance to engage the plate section 33 thereof with the corresponding end portion of the casingA, whereupon the casing will beforced rearwardly, thereby causing the wedge to move inwardly of the shell, wedging the friction shoes apart and effecting longitudinal movement of said shoes with respect to the friction surfaces of the casing. The inward movement of the friction system comprising the friction shoes C, C, and C and the wedge D is resisted by both the springs 33 and 33 of the spring resistance, thereby providing high shock absorbing capacity. As will be evident during thepreliminary action of the mechanism, the spring 33 only is compressed, thereby providing easy cushioning action. The free spring capacity of the spring 33 is limited when the follower section 33 of the pressure transmitting member D engages the casing A, and

during the remainder of the operation ofthe device combined spring and frictional resistance is provided.

Referring nextto the embodiment of the invention illustrated in Figures l0 and 11, my irnproved bufnng mechanism -proper comprises broadly a housing or casing H; a wedge J; lthree friction shoes K. K. and K; a pressure transmitting member M; a sectional spring abutment N;

lo wall |22 having a central opening |22 through which the reduced end portion |26 of the wedge J is adapted to extend. At the other end, the casing is interiorly screw threaded, as indicated at |20, to receive the threads |2| of the retaining member l5 S, which is in the form of a ring. The shoes K,

K, and K, which are substantially the same as the shoes C, C, and C, hereinbefore described in connection with Figures 1 to 9, inclusive, have frictional engagement with the friction surfaces 20 |24 of the casing and have `wedge faces on their inner sides which have wedging engagementwith the wedge faces |30|2|i|30 of the wedge J. The reduced section |25 of the wedge, J provides a stop shoulder |21 which engages the wall "5 |22 of the casing H and limits outward movement of the wedge. The friction shoes K, K, and K have shoulders I3|-|3|-|3|, which correspond to the shoulders 3|-,-3I-3l, hereinbefore described, and serve as abutment means for the cor,-

30 responding end of the inner coil of the spring resistance R. The spring resistance R, which comprises a relatively light inner coil |38 and a heavier outer coil |39, corresponds to the spring resistance F, hereinbefore described, and has the 35 outer coil thereof bearing respectively on the shoes K, K, and K and the sectional abutment member N. The inner coil |38 of the spring resistance R has its opposite ends bearing von the shoulders |3|-I3|-|3| of the friction shoes and the pressure transmitting member M. The pressure transmitting member M is of similar design to the pressure transmitting member D, hereinbefore described, and comprises a thimble portion to which the platelike member |33 is welded. The

. pressure transmitting member M differs from the pressure transmitting member D, hereinbefore described, in that it is merely welded to the thimble and does not have a dovetail joint therewith. At the inner end the thimble of the pressure transmitting member M is provided with an annular shoulder |32, which engages the retaining ring S and thereby limits outward movement of the pressure transmitting member M. The parts of the mechanism hereinbeiore described are substantially the same as the corresponding parts of the mechanism illustrated in Figures 1 to 9 inclusive. However, the abutment member N' differs from the abutment member E, hereinbefore described, in that the former is composed of three sections. 'I'hese sections are indicated form of a V-shaped plate member having a laterally, inwardly extending, flange |36 at the rear end thereof. The flanges ISB-ISG-ISB of said i sectional sleeve form abutment means for the outer coil of the spring resistance R. A s most clearly shown in Figure 10, the sectional spring abutment sleeve N is held against outward movement with` respect to the casing H by having shouldered engagement with an annular shoulder |40 formed at the left hand end of the casing H, as shown in Figure 10. vThe sections of the spring abutment sleeve N are annularly spaced apart, as shown in Figure 11,'to provide sufhcient clearance therebetween to permit collapse of the sleeve so that the same may be inserted through the left hand end of the casing H. as shown in Figure 10.

In assembling the parts of thek mechanism shown in Figures and 11, the procedure is thesame as that hereinbeore described in connection with Figures 1 to'9, inclusive, with the exception that the spring abutment N, which comprises the sections |35-|25-|35, is assembled with the casing byV successively placing the sections thereof in position and then expanding the sleeve N to the position shown in Figure 10 where it has shouldered engagement with the shoulder |40 of said casing.

The operation of the device shown in Figures 10 and 11 is substantially the same as the operation of the device hereinbefore described.

I have herein shown and described what I now consider the preferred manner of carrying out my invention, but the same is merely illustrative and I contemplate all changes and modifications that come within the scope of the claims appended hereto.

I claim:

y l. In a shock absorbingmechanism of the char- I Y of the shell and bearing on the inner end of said sleeve; and additional spring means opposing relative movement of said shoes and pressure transmitting member and extending through said sleeve.

y2. In' .a shock absorbing mechanism of the character described, the combination with a casing having interior friction surfaces at one end thereof; of friction shoes cooperating withl the friction surfaces of said casing; a wedge at said end of the casing movable lengthwise of the mechanism and normally projecting outwardly4 of the casing, said wedge having wedging engagement with said shoes; a movable pressure transmitting member telescoped within the other 'end of the casing; spring means opposing rela- ,tive movement of said shoes and casing; a. re-

movable sleeve in said casing transmitting the pressure from said spring means to the casing and holding said spring spaced from the last named end of the casing; and spring means extending through said sleeve and opposing relative movement of said shoes and pressure transmitting member.

3. In a shock absorbing mechanism of the character described, the combination with a friction shell; of friction shoescooperating with the friction shell; a wedge Vat one end of the -sheil having wedsing engagement with said shoes and being movable lengthwise of the mechanism and normally projecting outwardly of said end of the shell; means for limiting outward movement Lof said wedge; a spacing sleeve within the shell at the other end thereof; a pressure transmitting member at said last named end of the shell v telescoped within said sleeve and movable lengthwise thereof detachable retaining means connected to the' shellhaving shouldered enllement with the pressure transmitting lmember to limit outward movement of said member;

spring means opposing relative movement of said 5 shoes and shell and bearing on said sleeve; and additional spring means extending through the sleeve and bearing on said pressure -transmitting member andopposing relative movement of the latter and said shoes.

4. In a shock absorbing mechanism of the character described, the combination with a friction shell; of friction shoes cooperating with the friction shell; a wedge at one end of the shell having wedging engagement-with said shoes and l5 being movable lengthwise of the mand normally projecting outwardly of said end of the shell; means for limiting outward movement of said wedge; a spacing sleevetelescoped within the other end, of the shell: a pressure transmitting member at said last named end of the shell telescoped within said sleeve and movable lengthwise of the shell; means fixed tosaid shell at said second named end thereof for limiting outward movement of said sleeve and pressure transmitting member; spring `means bearing on the inner end of said sleeve and opposing relative movement of' said shoes and sleeve; and additional spring means extending through the sleeve and opposing end'of the casing movable lengthwise of the mechanism and normally projecting outwardly of the casing, said wedge having wedging engagement with said shoes; a movable pressure trans- 40 mitting member telescoped within the other end of the casing and normally projecting from said end of the casing; a'sectional collapsible spring abutment member within said casing at said 'last named end thereof having the spring abutment face thereof spaced inwardly from the corresponding end of said casing; spring means opposing relative movement of said shoes and springabutment means;- and spring means extending through said spring abutment means and opposing relative movement of said shoes and pressure transmitting member.

6. In a shock abwrbing mechanism. of the character described, the combination with a casing provided with an interior stop shoulderat one end and a laterally inwardly directed retaining flange at the other end, said casing having interior friction surfaces adjacent to said flange; of Y friction shoes having sliding frictional engagement with said friction surfaces; a block 00 having wedging engagement with said shoes, said block having shouldered engagement with said flange for limiting outward movement of the `wedge block, said wedge block also having a stem projecting outwardly of the casing; a hollow stop sleeve within the casing bearing on the shoulder of said shell and -being held against outward movement bysaid shoulder; a pressure transmitting thimble telescoped within the end ofv the' casing having said shoulder, said thimble having A a stop flange thereof outwardly of the casing relative movementv of the pressure transmitting. memberandshoes; andaspringsurroundingsaid vfirstnamed swing and bearing at opposite'ends Aand movablelengthwise thereof; removable spring abutment meanswithin the shell at said iastnamedendthereohmeansonsaidlastnamed end of tbe shell. detachably connected thereto and havingshouldered engagement with-said 20 springabutment and pressure transmitting member for limiting outward movement thereof;

Aspring means Vopposingrelative movement of saidshoes and spring abutment means; and additional spring means opposing relative movement of said 25 shoes' and pressure transmitting member.

8'. Inashockabsorbingmecbanismofthecharacter described, the combination withv a friction shell; of friction shoes .cooperating with the friction shell; a wedge at one end ofthe shell having 30 wedging engagement with said shoes'and .being movable lengthwise ofthe meclnnism and normally projecting outwardly of said end of'the shell; means for -limiting outward movement of said wedge; a pressure transmitting member at 35 theother end of the'shell extending into the shell and movable lengthwise thereof removable spx-ing abutment means within said shell at said -last named end thereof; an adiustableretaining ringscrewthreadedintosaidsecondnamedend 40 of the shell and abutting said spring abutment meanstohold thesameagainstmovemeitout. wardiyofthesbelLsaidpressure memberextending throughsaid ring and having' shouldered engagement therewith to limit out- 45 ward movement of,l said member; spring means opposing relative movement of said shoes and spring abutment means; and additional spring means opposing relative movement of saidv shoes and pressure transmitting member. 50

9. Inashochabsorbingmechanismofthecharacter described, the combination with a casing having interior friction surfaces at one end thereof; of friction shoes cooperating with the friction surfacesofsaidcasinmawedgeatsaidendofthe '55 casing movable lengthwise of the mechanism and normally projecting outwardly of the casing, said wedge having wedging engagement with said shoes; a removable, longitudinally split, spring abutment sleeve telescoped within said casing at so the other end thereof, said sleeve having a spring abutmentfacespacedfromsaidlast namedend ofthecasing;amovabieprsuretransmitting member telescoped within saldslee'veand normallyproiectingfromsaidendof'thecasinncs springmeans bearingonsaid abutmentfaceand opposing relative movement of said shoes and spring abutment sleeve;` and spring means extendingthroughsaidspringabutmentmeansand opposing relative movement of said shoes and 70 pressure transmitting member.

10.Ina shock mechanism ofthe character described, the combination with a friction shell; of friction shoes cooperating with the frictionshelhawedgeatoneendoftheshell having wedging engagement with said shoes and being movable lengthwise of the mechanism and normally projecting outwardly of said end of the shell; means for limiting outward movement of said wedge; a pressure transmitting member at the other end of the shell extending into the v shell and movable lengthwise thereof; a removable, sectional spring abutment sleeve telescoped within said shell at said last named end thereof and enclosing the inner end portion of said pressure transmitting member, said sleeve having a transverse spring abutment wall at the inner end thereof, said wall having an opening therethrough; meansfor limiting outward movement of said spring abutment sleeve; spring means bearing at one end on said transverse wall of said abutment sleeve opposing relative movement of said shoes and sleeve; and additional spring means extending through the opening of said 20 sleeve and opposing relative movement of said shoes and pressure transmitting member.

11. In a shock absorbing mechanism of the character described, the combination with a casing having interior friction surfaces at one end thereof; of friction shoes cooperating with the friction surfaces of said casing; a wedge at said end of the casing movable lengthwise of the mechanism and normally projecting outwardly of the Casing, said wedge having Wedging engagement with said shoes; a removable sectional spring abutment sleeve seatedv within the other end of said casing and held against outward movement with respect to the casing, said sleeve having a spring abutment Wall at the inner end thereof; a movable pressure transmitting member telescoped within said spring abutment sleeve and normally projecting from saidlast named end of the casing; a spring interposed between and bearing on the shoes and said wall of the spring abutment sleeve respectively; and a second spring enclosed within said irst named spring, said second named spring extending through said spring abutment sleeve and being interposed between and having its opposite ends bearing respectively on said pressure transmitting member and shoes.

' ARNOLD E. DENTLER.

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