US2430505A - Resilient car-end buffer - Google Patents

Description

Nov; 11, 1947.

s. B. HASELTXNE I RES ILIENT CAR-END BUFFER Filed Nov. 4, i944 Patented Nov. 11, 1947 RESILIENT CAR-END BUFFER Stacy B. Haseltine, La Grange, Ill., assignor to W. H. Miner, Inc., Chicago, 111., a corporation of Delaware Application November 4, 1944, Serial No. 561,873

6 Claims. 1

This invention relates to improvements in buffers for railway cars.

One object of the invention is to provide a buffer mechanism for railway cars having initial spring action to absorb the lighter shocks to which the mechanism is subjected, followed by higher frictional resistance to take care of the heavier shocks, wherein the buffer mechanism comprises a buiier housing secured to the car; a buffer head including a friction casing slidingly telescoped within the housing; friction shoes in sliding frictional engagement with the interior walls of the casing; a wedge block in wedging engagement with the shoes; spring means yieldingly opposing inward movement of the wedge block with respect to the housing; and an additional spring means yieldingly opposing movement of the shoes and wedge with respect to the casing in lengthwise direction toward each other, and wherein the bufier head and housing have cooperating stop lugs in shouldered engagement with each other for limiting relative lengthwise separation of the buffer head and housing, and the wedge, shoes, and buffer head are locked against rotation with respect to the housing to maintain the longitudinal alignment of the lugs and thus prevent accidental disengagement of the lugs from each other, the wedge being locked against rotation with respect to the housing by a separate locking memher, which greatly facilitates assembling of the mechanism.

A more specific object of the invention is to provide a mechanism as specified in the preceding paragraph, wherein the lockin member for locking the wedge against rotation with respect to the housing comprises a spring presse'd plunger having interlocking engagement with the wedge andhousing to hold these parts against rotary displacement with respect to each other.

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

In the drawing forming a part of this specification, Figure 1 is a longitudinal, vertical sectional view of my improved buifer mechanism, illustrating the same mounted in position on the end of a railway car. Figures 2, 3, and 4 are transverse, vertical sectional views, corresponding respectively to the lines 2-2, 3-3, and 4-4 of Figure 1, the outer spring being omitted in Figure 3.

In said drawing, l indicates a portion of the end wall of a railway car, the portion illustrated being at one side of the longitudinal center line of the car and having my improved buffer mechanism mounted thereon. As will be understood,

the bufier mechanism is duplicated at the other side of the end of the car and the two mechanisms cooperate in a well-known manner with a pair of similar buffer mechanisms on the end of an adjacent car.

My improved buffer mechanism comprises broadly a housing A; a buffer head B; three friction shoes C-C-C; a wedge block D; a spring resistance E; an additional sprin resistance F; a locking member G; and a relatively light spring H for holding the locking member in locking position.

The housing A is in the form of a tubular shell closed at the rear end by a transverse wall H, which is extended laterally outwardly at opposite sides of the shell to provide securing flanges l 2l2. The housing A, as shown, is of cylindrical cross section and is provided with six equally spaced, inturned stop lugs l3--l3 at the'front end thereof, which is open. The rear wall ll of the housing A is provided with a central opening litherethrough and interiorly of the housing a hollow cylindrical boss I5 is provided which is aligned with the openin l4 and extends inwardly from the wall ll, being formed integral therewith. The opening of the boss I5 is of hexagonal, transverse cross section, thereby providing a seat or pocket, which is of hexagonal shape. The housing A is'secured to the wall ll] of the car by any suitable means, such as bolts Iii-l6, extending through slots in the flanges l2-I2 and suitableopenings in the wall Ill of the car.

The buffer head B comprises a cylindrical casing I! which is closed at the front end by a transverse wall which extends laterally outwardly of the head on all sides thereof, thereby providing the buffer head proper. The casing I1 is telescoped within the housing A and has lengthwise sliding movement therein. At the rear end, that is, the open end of the casing H, the same is provided with longitudinally extending, radially outwardly offset sections I 9-) providing shoulders 2l20 forming retaining lugs. The ofiset sections l9 and lugs 20 are six in number and the latter cooperate with the six inturned stop lugs I3--l3 of the housing A. The lugs 20 are of such a width that they will pass freely between adjacent of the inturned stop lugs l3l3 to facilitate assembling of the housing A and buffer head B, the shoulders of the buffer head being brought into alignment with the shoulders of the housin by giving the buffer head a slight turn. The offset sections or portions l9|9 of the easing l1 fit the interior of the cylindrical wall of the housing A and form guide members which prevent tilting or drooping of the buffer head. The offset sections I9I9 are of the same width as the lugs 20, The casing wall is interiorly thickened, as indicated at 22, forwardly of the offset sections I 9--I 9. The thickened portion 22 of the casing is of hexagonal, interior cross section and presents three forwardly converging friction surfaces 23-23-23 of V-shaped, transverse cross section, the adjacent hexagonal side walls of the casing forming the V-shaped friction surfaces.

The friction shoes C are three in number and have outer, longitudinally extending friction surfaces 2424-24, each surface of V-shaped, transverse cross section and engaging respectively with the corresponding V-shaped friction surface 23 of the casing II. On the inner side, each shoe presents a flat wedge face 25, the wedge faces 25-25-25 of the three shoes converging inwardly or forwardly of the mechanism.

The wedge D is in the form of an elongated, hollow, postlike member having a head 26 at the front end thereof provided with wedge faces 29, and a hollow shank 21 extending rearwardiy from the head. The opening of the hollow shank or stem 21 of the wedge D is of hexagonal, transverse cross section and corresponds in cross sectional size to the opening of the boss I and slidingly accommodates the locking member G. The shank or stem 21 is of cylindrical, exterior contour and corresponds in cross sectional size to the boss I5 and is adapted to engage the front or outer end of the latter to limit movement of the wedge rearwardly of the mechanism. The parts are so proportioned that movement of the wedge D is limited before the mechanism has been completely or fully compressed, thereby compelling the wedge to move with respect to the friction casing II during the last part of the compression stroke. The enlarged head 26 of the wedge D provides a rearwardly facing, annular abutment shoulder 30 where it joins the shank 21. The shoulder 30 serves as an abutment for the front end of the spring resistance E. To hold the wedge 13 assembled with the casing I'I, lugs 3| are provided which project laterally outwardly or radially from the wedge and engage corresponding lugs 32-3Z32 at the inner end of the casing IT. The lugs 3| of the wedge extend between adjacent shoes, thereby locking the wedge and shoes against relative rotation with respect to each other about the longitudinal central axis of the casing.

The spring E is in the form of a single, relatively heavy, helical coil and surrounds the shank or stem 21 of the wedge D and the boss of the housing A and bears at its front end "on the abutment shoulder of the wedge and at its rear end on the transverse end wall II of the housing A,

The spring resistance F comprises inner and outer, helical coils, which bear at their front ends on the transverse wall I8 of the buffer head B. The inner spring bears at its rear end on the wedge D and the outer spring bears at its rear end on the shoes 'CC-C which are provided with transverse abutment shoulders for this purpose.

The locking member G is in the form of a hollow, tubular plunger of hexagonal, exterior cross section, closed at the rear end by a transverse rear wall 33. The plunger member G is seated at its rear end in the hexagonal seat or pocket of the boss I5 of the housing A and is thus locked against rotation with respect to the housing. The forward end of the plunger G is telescoped within the hexagonal opening of the stem 21 of the wedge D, slidingly fitting the same, and thus locks the wedge against rotation with respect to the housing while permitting lengthwise movement of the wedge and housing.

The spring H, which is in the form of a helical coil, is disposed within the openings of the stem 21 of the wedge and the plunger G, having its front end seated in a pocket 34 in the head 25 of the wedge member and its rear end bearing on the transverse end wall 33 of the locking member G. The spring H holds the locking member G yieldingly seated in the pocket of the boss I5 of the housing A, thus locking the member G against rotation with respect to the hous- In assembling the mechanism, the spring resistance F and the shoes CCC are first placed within the casing 11 of the buffer head B and the shoes forced inwardly to an extent to clear the inner sides of the lugs 323-2--32 of the casing 11, the shoes being forced inwardly to such an extent that the lugs 3| of the wedge will pass freely between the outer ends of the shoes and the inner sides of the lugs 32. The wedge is then inserted within the casing I1 and moved inwardly to an extent to bring the lugs 3I-3I--3I thereof inwardly of the lugs 32-3232 of the casing. As will be understood, the lugs of the wedge are positioned to pass between the lugs of the casing during this operation. The wedge is then given a partial turn to bring the lugs thereof into alignment with the lugs of the casing and the pressure is removed from the shoes to permit the spring F to expand and force the shoes outwardly into engagement with the wedge D with the lugs 31 of the wedge disposed between adjacent shoes. As will be evident, outward movement of the wedge is limited by engagement of the lugs thereof with the lugs 32 of the casing. The locking member G and the spring H are then assembled with the wedge D and the spring E placed over the shank of the wedge D. The housing is then telescoped over the inner end of the casing II. In applying the housing A to the casing II, a tool in the form of a bar is employed, which is entered through the opening I4 of the wall II of the housing A and engaged with the rear end of the locking member G to force the same inwardly of the wed e D to such an extent that the rear end of the locking member will clear the front end of the boss I-5 of the housing while the lug I3 of the housing are being engaged with the shoulders or lugs 20 of the casing of the buffer head B. While the housing A is being applied to the casing I! of the buffer head, the former is turned to a position that the lugs I3 thereof will pass between the lugs 20 of the casing. After the lugs I3 have been brought to a position forwardly of the lugs 20, the housing A is given a partial turn with respect to the casing IT to bring the lugs of the former in longitudinal alignment with the lugs of the latter. During this operation, the hexagonal locking member G is brought into registration with the hexagonal'pocket of the boss I5 of the housing A. The holding tool is then removed, permitting the spring resistance H to force the hexagonal locking member into the pocket of the boss I5, thereby locking the wedge against rotation with respect to the housing A. In this connection it is pointed out that the locking of the wedge to the boss I5 of the housing also effects positive locking of the buffer head B against rotation with respect to the housing A so that the lugs 25] of the casin are maintained in and the casing l1, and the lugs 3l-3l3l of the wedge which are engaged between adjacent of the shoes C-C-C. It should be further noted that the flat engagement of the wedge faces of the wedge D and shoes C-C-C also serves to lock the shoes against rotation with respect to the wedge.

The operation of my improved buffer mechanism is as follows: Upon inward movement of the buffer head B, through pressure exerted thereon by any object, such as a buffer head of an adjacent car, the head B is forced inwardly of the housing A, carrying the shoes C-CC' and the wedge D therewith, and compressing the spring resistance E, which functions as a preliminary spring to absorb the lighter shocks. Upon further compression of the mechanism, the movement of the wedge is arrested by engagement with the front end of the boss [5, thereby compelling the casing l! to slide inwardly with respect to the friction shoes during the remainder of the compression stroke. Due to the wedging engagement between the shoes C-CC and the wedge D, high frictional resistance is provided during this last mentioned stage of the operation to absorb the heavier shocks. When the actuating force or pressure is removed from the buifer head B, the spring resistance E returns the buifer head and the wedge D to the normal full release position shown in Figure 1 and the spring F brings the wedge into shouldered engagement with the stop lugs of the casing l1 and the shoes to their full release position, as shown in said figure. As will be evident, outward movement of the buiiing head is positively limited by shouldered engagement of the lugs 20 of the head with the lugs 13 of the housing A.

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:

1. In a buffer for railway cars, the combination with a housing adapted to be secured to the end of a car; of a buffer head; a friction casing section rigid therewith, said friction casing sec tion being slidingly telescoped within the housing; interengaging shoulders on aid casing section and housing for limiting lengthwise separation of the housing and buffer head; friction shoes slidingly telescoped within the casing; a wedge engaging said shoes to spread the same apart; spring means yieldingly opposing relative movement of the wedge and housing toward each other; a slidable locking member locking the wedge and housing against relative rotation; and spring means yieldingly opposing movement of the wedge and shoes inwardly of the casing section.

2. In a buffer for railway cars, the combination with a housing adapted to be secured to a car; of a buffer head; a friction casing rigid with said head projecting therefrom and telescoped within the housing, said housing and casing having interengaging lugs limiting lengthwise separation of the housing and casing; friction shoes slidingly telescoped within the casing, said shoes and casing having interengaging friction surfaces restricting the shoes to movement in a direction 6 lengthwise of the casing; a wedge having wedging engagement with the shoes on flat, interengaging faces; a locking member having sliding engagement with the wedge and fixed against rotation with respect to the housing limiting the wedge to lengthwise movement with respect to said housing; spring means yieldingly opposing lengthwise movement of the wedge inwardly of the housing; and spring means within the casing yieldingly opposing movement of the wedge and shoes toward the buiier head.

3. In a buffer for railway cars, the combination with a housing adapted to be secured to the end of a car; of a buffer head including a friction casing section, said friction casing section being slidingly telescoped within the housing; interengaging shoulders on said casing section and housing for limiting lengthwise separation of the housing and buffer head; friction shoes slidingl telescoped within the casing; a wedge engaging said shoes to spread the same apart; spring means yieldingly opposing relative movement of the wedge and housing toward each other; a slidable locking plunger carried by said wedge; a seat on the housing with which said plunger is engaged to lock the wedge against rotation with respect to the housing; spring means reacting between the plunger and wedge for holding said plunger engaged in said seat; means limiting relative movement of the housing and wedge to less than the full compression stroke of the mechanism and spring means yieldingly opposing movement of the wedge and shoes inwardly of the casing section.

4. In a buffer for railway cars, the combination with a housing adapted to be secured to a car; of a buifer head including a friction casing projecting therefrom and telescoped within the housing, said housing and easing having interengaging lugs limiting lengthwise separation of the housing and casing; friction shoes slidingly telescoped within the casing, said shoes and casing having'interengaging friction surfaces restricting the shoes to movement in a direction lengthwise of the casing; a wedge having wedging engagement with the shoes on flat, interengaging faces; a boss on said housing having locking pocket; a spring pressed locking plunger locked against rotation with respect to the wedge and seated in said pocket for limiting the wedge to lengthwise movement with respect to said housing; spring means yieldingly opposing lengthwise movement of the wedge inwardly of the housing, said wedge being engageable with said boss for limiting movement of the wedge inwardly of the housing to less than the full compression stroke of the mechanism; and spring means within the casing yieldingly opposing movement of the wedge and shoes toward the buffer head.

5. In a bufier for railway cars, the combination with a housing adapted to be secured to a car; of a buffer head including a friction casing projecting therefrom and telescoped within the housing, said housing and easing having interengaging lugs limiting lengthwise separation of the housing and casing; friction shoes slidingly telescoped within the casing, said shoes and casing having interengaging friction surfaces restricting the shoes to movement in a direction lengthwise of the casing; a wedge having wedging engagement with the shoes on flat, interengaging faces; a stem of angular, interior cross section on said wedge; a locking plunger of angular cross section slidingly telescoped within said stem; a spring within said stem for holding said plunger projected; a boss on the housing having an opening of angular cross section within which said stem is engaged and held against rotation with respect to the housing; spring means yieldingly opposing lengthwise movement of the wedge inwardly of the housing; and spring means within the casing yieldingly opposing movement of the wedge and shoes toward the buffer head.

6. In a buffer for railway cars, the combination with a housing adapted to be secured to a car, said housing being open at the front end and closed at the rear end by a transverse wall; of a bufier head including a friction casing projecting therefrom and telescoped within the open end of the housing, said housing and casing having interengaging lugs limiting lengthwise separation of the housing and casing;-friction shoes slidingly telescoped within the casing, said shoes and casing having interengaging friction surfaces restricting the shoes to movement in a direction lengthwise of the casing; a wedge having wedging engagement with the shoes on flat, interengaging faces; a hollow stem of angular, interior cross section on said wedge; a locking plunger of angular cross section telescoped within said stem; a spring reacting between the plunger and wedge to hold said plunger projected; an inwardly projecting boss on said transverse wall of the housing, said boss having a bore of angular cross section within which the plunger is seated and held against rotation; spring means yieldingly opposing lengthwise movement of the wedge inwardly of the housing, said stem of the wedge being engageable with the boss to limit relative movement of the wedge and housing to less than the full compression stroke of the mechanism; and spring means within the casing yieldingly opposing movement of the wedge and shoes toward the buffer head.

STACY B. HASELTINE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,146,015 Hazeltine Feb. 7, 1939 FOREIGN PATENTS 5 Number Country Date 125,465 Australia Nov. 23, 1931

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