Jan. 14, 1947. G. E. DA1-H FRICTION SHOCK ABSORBING MECHANISM Filed July 16,' 1943 . 2,414,222 2 Patented Jan. 14, 1947 UNITED STATES PATENTA OFFICE 2,414,222 FRICTIONl SHOCK ABSORBING MECHANISM George E. Bath, Chicago, Ill., assigner to W. H. Miner, Inc., Chicago, Ill., a corporation of Dela Application `îuly 16, 1943, Serial N o. 494,925 1 4 Claims. This invention relates to improvements in fric tion shock absorbing mechanisms. One object of the invention is to provide a fric~ tion shock absorbing mechanism, especially adapted for railway draft riggings, comprising a friction casing having an inwardly tapered fric (Cl. 213-34) 2 The casing A is of substantially hexagonal in terior and exterior cross section, having the fric tion shell section at the forward end, which is open, and the spring cage section at the rear end thereof. The casing A is closed at the rear end by a transverse vertical wall iii which projects at opposite sides beyond the side walls of the cas ing to provide a rear follower member of rectan tion shell section; a friction clutch including a central wedge; a plurality of wedge blocks sur rounding the central wedge. and a plurality of friction shoes interposed between the walls of 10 gular outline, which is integral with the casing. The follower member and casing are reinforced the tapered friction shell section of the casing by webs ll-H formed integral with the follower and the wedge blocks; and a spring resistance member and the casing side walls, The friction opposing inward movement of the clutch, where shell section of the casing is provided with six in the wedge blocks have wedging engagement with both the central wedge and the friction ^ interior, substantially fiat friction surfaces i2--l 2 which converge inwardly of the casing and shoes to provide for differential action, whereby are spaced symmetrically about the central lon the shock absorbing capacity of the mechanism gitudinal axis of the mechanism. The interior is materially increased. of the friction shell section thus presents six Another obiect of the invention is to provide interior friction surfaces, adjacent surfaces oi’ a friction shock absorbing mechanism compris which are angularly disposed with reference to ing a friction casing, a friction clutch within the each other, thereby providing three pairs of sur» casing, and spring resistance means within the faces, the adjacent members of each pair to« casing yieldingly opposing inward movement of gether forming a friction face of V-shaped trans the clutch, wherein the casing is open at one end verse cross section. only and the parts are insertable ._irough said At the open end, the casing is provided with open end in assembling the mechanism, and are a continuous inturned circular retaining flange held assembled by shouldered engagement be l 3 which overhangs the opening and forms limit tween certain members of the clutch and the fric~ ing stop means for the wedge blocks O_O-C. tion casing, thereby dispensing with the usual re~ 'I‘he combined spring follower and central tainer bolt commonly employed to hold the parts wedge B comprises a relatively heavy circular of a friction shock absorbing mechanism assem plate or disc Irl having a forwardly projecting bled. central post thereon forming the central wedge Other objects of the invention will more clearly i5 of the mechanism. The wedge i5 is inwardly appear from the description and claims hereinn tapered and is in the form of the frustrum of after following. \ a cone, The taper of the wedge or post l5 is In the drawing forming a part of this specifica relatively slight so that the same presents a wedge tion, Figure 1 is a front elevational view of a fric face it of relatively keen angularity with respect tion shock absorbing mechanism embodying my to the central longitudinal axis of the mechanism. improvements. Figure 2 is a horizontal sectional The wedge blocks C, which are preferably three View, corresponding substantially to the line 2_2 of Figure 1. Figure 3 is a transverse vertical sec 40 in number, are of similar design. The three blocks C---C~-C surround the post or wedge l5, as tional view, corresponding substantially to the clearly shown in Figures l and 2, and project outw line 3_3 of Figure 2. Figure 4 is a view, similar wardly of the casing. Each block C has an arc to Figure 2, illustrating the manner of assembling the mechanism, the rear end of the casing being broken away. Figure 5 is a front elevational view of Figure 4, looking from left to right in said last named figure. ~ As shown in> said drawing, my improved fric tion shock absorbing mechanism comprises broadly a casing A providing a combined friction shell and spring cage; a combined spring follower Àand central wedge B; three wedge blocks O_O-C; three friction shoes D-D-D; and a spring resistance E. 55 shaped, laterally projecting flange ll on the outerside thereof, between its ends, which engages in back of the flange il? of the casing to limit out~ ward movement of the block. On the inner side, each block C is provided with transversely curved wedge face l5, correspondingly inclined to and fitting the wedge face lâ of the _wedge i5. 0n the outer side, inwardly of the iiange il, each block C is provided with a substantially dat wedge of facethei9 mechanism which is inclined at a greater to the longitudinal angle than the wedge face i6 of the wedge I5. At the front 2,414,222 4 / . turns the parts to the normal full release posi tion shown in Figure 2, outward movement of the wedge blocks C--C-C being limited by shoul dered engagement with the flange I3 of the casing. ends, the blocks C-C-C are provided with flat abutment faces 20 adapted to be engaged by the usual front follower of the draft rigging of the railway car. The friction shoes D, which are three in num I have herein shown and described what I now consider the preferred manner of carrying out my invention, but the same is merely illustrative ber, are interposed between the blocks C-C-C and the interior friction surfaces I2 of the cas ing. Each shoe has a friction surface 2l on the outer side thereof of V-shaped transverse cross and I contemplate all changes and modifications that come within the scope of the claims ap section, which cooperates with the corresponding 10 pended hereto. V-shaped friction face of the casing formed by I claim: two adjacent surfaces I2-I2 of said casing. At 1. In a friction shock absorbing mechanism, the inner side, that is, the side nearest the cen tral axis of the mechanism, each shoe has a flat wedge face 22 cooperating with and correspond 15 ingly inclined to the wedge face I9 of the corre sponding wedge block C. At the rear ends, the shoes have flat transverse end faces 23 bearing the combination with a friction casing open at one end and having an interior stop shoulder at said open end; of a friction clutch comprising `a plurality of wedge blocks, friction shoes sur rounding said wedge blocks, and a spreading member between said wedge blocks, said wedge ' on the forward side of the spring follower disc I4 blocks being arranged symmetrically around the 20 0f the member B. central longitudinal axis of the mechanism, said The spring resistance E comprises a relatively blocks- having lateral projections engaging the light inner coil and a heavier outer coil inter shoulder of the easing to limit outward movement posed between the follower disc Iii of the member B and the rear wall Iâ] of the casing A. The of said blocks, said friction shoes having sliding engagement with the interior walls of the cas spring resistance is preferably under initial com 25 ing and wedging engagement with said wedge pression in the assembled condition of the parts. blocks, said spreading member comprising an In assembling the mechanism, the spring re inwardly tapered stem having >wedging engage sistance E, the combined wedge and spring fol ment with the wedge blocks to hold the same lower B, and the shoes D-D-D are first placed spread >apart with the lugs thereof in shouldered within the casing A by inserting these parts 30 engagement with the stop shoulder of the casing, through the open front end of the casing. With said wedge blocks being insertable through the the casing A standing on end, the combined open front end of the casing when said spreading wedge and spring follower B is forced inwardly member is displaced inwardly to clear said blocks; by a cylindrical barlike tool 24 engaging the outer and spring means opposing inward movement end of the post I5 of said member B. As the 35 of said clutch. ^ ’ member B is forced inwardly, the shoes D-D-D, 2. In a friction shock absorbing mechanism, which are resting on the follower disc Id will move the combination with an inwardly tapered fric inwardly therewith. When the parts have been tion casing .open at one end and closed at the displaced inwardly of the casing, approximately other end, said casing having an inturned stop to the position shown in Figure 4, the three wedge 40 flange at said open end; of three friction shoes blocks C--C-C are entered through the open having sliding frictional engagement with the end of the casing and arranged around the bar interior of said casing; three wedge blocks hav 24, as shown, with the flanges I'I-I'I-I'I dis ing wedging engagement with said shoes, respec posed inwardly of the flange I3 of the casing. tively, each of said wedge blocks having a later The wedge blocks C-C-C are then spread ally projecting ñange engageable in back of the apart to bring the flanges I'l thereof under the flange of the casing to limit outward movement flange I3 of the casing, and the tool 24 is with of said block; an inwardly tapered spreading drawn, permitting the parts to assume the posi member engaged between said wedge .blocks to tion shown in Figure 2, with the post I5 of the hold said wedge blocks spread- apart with the member B engaged between the wedge blocks 50 flanges thereof in position to engage said flanges C-C--C. of the casing; means on said spreading member The operation of my improved shock absorbing engageable with the inner ends of the shoes for mechanism is as follows: Upon inward movement limiting outward movement of the spreading of the wedge blocks C-C-C with respect to the member with respect to said shoes; and spring casing A being produced due to compression of means yieldingly resisting inward movement of the mechanism, the spring resisted friction shoes the spreading member and shoes. D-D-D are wedged apart and carried inwardly 3. In a friction shock absorbing mechanism, of the mechanism against the resistance of the the combination with an inwardly tapered fric spring E. Due to the taper of the casing, the tion casing open at one end and having an shoes will be displaced inwardly toward the cen inturned stop flange at said open end; of three tral axis of the mechanism during said inward friction shoes having sliding frictional engage movement along the friction surfaces of the ment with the interior of said casing; three wedge casing, thereby causing a differential action be blocks having wedging engagement with said tween the wedge blocks C-C-C and the shoes shoes, lrespectively, each of said wedge blocks D-D-D, whereby the shoes are advanced in having a laterally projecting flange engageable wardly more rapidly than the blocks C-C-C in back of the flange of the casing to limit out and the central wedge B is pulled inwardly with .f ward movement of said block; a spring follower respect to the blocks C-C--C, spreading the lat bearing on the inner ends of said shoes, said ter apart, thus increasing the inward differential spring follower having a central wedgeV pro movementJ of the shoes. As will be evident, the jection rigid therewith engaged between said compound differential action provided materially increases the shock absorbing capacity of the mechanism. Upon the actuating force being reduced, the expansive action of the spring resistance E re wedge blocks, said projection and blocks having cooperating wedge faces, said wedge projectionl . holding said blocks spread apart in position to 75 engage said flanges of the casing; and spring 2,414,222 means yieldingly resisting inward movement of said spring follower. ` 4. In a friction shock absorbing mechanism, the combination with a friction casing open at its front en`d and closed at its rear end, said casing having inwardly converging interior friction sur faces at said open end; of a central rearwardly tion surfaces of the casing and having fiat trans verse rear end faces bearing on said spring fol lower; three friction blocks interposed between the shoes and post, said shoes and blocks having interengaging fiat wedge faces, said blocks having transversely curved wedge faces engaging the surface of said post; and a spring resistance with~ tapered wedge post of frusto-conical shape hav in the casing yieldingly opposing inward Inove ing an integral flat spring follower plate at the rear end thereof rigid therewith; three friction 10- >ment of the spring follower. shoes having frictional engagement with the flric GEORGE E. DATI-I.