Патент USA US2403585код для вставки
July 9, 1946- G. E. DAQTH ET AL ‘2,403,585 DRAFT GEAR Filed July 1'7, v1945 ,énlz. éujwg 1 I Gear‘ge E’. ?at/Z 151714711 $0M)” By M 2,403,585 Patented July 9, 1.946 _ UNITED STATES PATENTY’OFFICE DRAFT GEAR George E. Dath and‘Roland J. Olander, Chicago, Ill., assignors to W.- H. Miner, Inc., Chicago, 11]., a corporation of Delaware Application July l7, 1943, Serial No. 495,092 7 Claims. (Cl. 213—34) 2 1 This invention relates to improvements in draft gears for railway cars. One object of the invention is to provide a railway draft gear, comprising a friction shock absorbing mechanism, especially designed for ab‘ sorbing shocks produced by a pulling or draft action applied to the coupler or drawbar of'a frame structure has a transverse connecting member I2 which extends between the two sills from one to the other, and has its opposite ends ?xed thereto. The member vl2 serves as the front stop of the draft rigging of the car and is reins forced by a heavy plate I 3 on the inner side there of, which is preferably welded thereto. ‘The end sill l0 and the member l2 are of channel-shaped I cross section and are connected by top and bot! A more speci?c object of the invention is to provide a draft rigging for railway cars com 10 tom plates l4 and M, which are secured to the top and bottom ?anges of said channel members. prising a drawbar and a friction shock absorb The drawbar of the car, which is indicated by _| 5, ing mechanism, especially designed to cushion the is of the type having a coupling hook at the outer pulling shocks transmitted by the drawbar, end thereof for engagement with the coupling wherein the friction shock absorbing mechanism includes a friction casing, friction shoes slidable 15 means of an adjacent car. The drawbar l5 has an enlarged head 16 at the outer end having the within the casing, a central wedge spreading hook formed. thereon. The shank ll of the draw member cooperating with the shoes, and spring railway car. resistance means within the casing opposing in bar, 15, which extends rearwardly from the head, bined spring and frictional resistance to provide shank [1, thereby providing top and bottom is of cylindrical cross section, that is, in the form ward movement of the shoes, and wherein the friction shock absorbing mechanism is actuated 20 of a cylindrical bar or shaft. The usual nut I8 is threaded on the rear end of the shank I1. The in draft by the drawbar which extends through drawbar I5 is accommodated for lengthwise slid the casing and has shouldered engagement with ing movement in aligned openings [9 and 20 in the wedge to force the latter inwardly of the the end sill l0 and connecting member l2-l3. casing, thereby spreading the shoes apart and The head l6 of the drawbar is reduced in size-at moving the same inwardly of the casing opposed the rear end thereof where it joins the cylindrical by the spring resistance, thus providing high com shoulders 2 l—-2l adapted to engage the front face of the end sill l0 and limit inward movement of Other objects of the invention will more clearly appear from the description and claims herein 30 the drawbar. Our improvements, as shown in the drawing, after-following. , comprise broadly a friction casing -A, a wedge . In the drawing forming a part of this speci?ca block B, three friction shoes C—C-—C, and a tion, Figure 1 is a longitudinal sectional view, spring resistance D. . , through the underframe structure of a railway As shown in Figure 1, the friction unit com car, at'one end thereof, illustrating our improve 35 prising the casing A, block B, shoes c-o_c, and ments in connection therewith. Figure 2 is an spring D, is disposed between the draft or center end, elevational view, on an enlarged scale, of the the desired cushioning action. , sills of the car in abutment with the front stop l2-l3. The shank I‘! of the drawbar 15 extends of the car being omitted. Figure 3 is a vertical 40 through the unit and actuates the same in draft ~ sectional view, corresponding substantially to the ‘ action, as hereinafter pointed out. I The friction casing A is in the form of a shell line »3--3 of Figure 2. Figure 4 is a view, similar of hexagonal transverse cross section, open at one to Figure 2, illustrating the manner of assembling end, and closed at the other end by a transverse the parts of the friction shock absorbing unit. structure shown in Figure 1, looking from right to left in said ?gure, the underframe structure Figure 5 is a view, similar to Figure 3, but taken 45 wall 22. As shown in Figure 1, the closed end of the casing A bears on the front stop '|2-—l3 of on the line 5-5 of Figure 2, illustrating the man the underframe of the car. The open end of the ner of assembling the parts of the friction shock casing is thus presented at the rear or inner end absorbing unit. of the draft rigging. The side walls of the casing. In said drawing, [0 indicates the usual end sill of the carvunderframe structure, and II one 50 which are indicated by 23~—23, are thickened at the open end of the casing, as indicated at 24, of the center sills. As will be understood by those and present six ?at interior friction surfaces skilled in this art, the usual underframe structure 25—25 which converge inwardly of the casing, comprises two spaced center sills and these are thereby providing a tapered friction shell portion ?xed at their front ends to the end sill. Rear 26 at the open end of the casing. vAt the open wardly or inwardly of the end sill, the under 2,403,585 3 ‘ ,9; 4 end, the hexagonal casing is provided with three inturned stop lugs 21—21-21, the'lugs being and shouldered against the bottom of said seat. The nut i8 is preferably secured against accl dental removal by a cotter pin 42 extending through the end of the drawbar shank. In assembling the mechanism, the parts are all located at alternate corners of the same. Spaced inwardly from the stop lugs 21-21--21 and in longitudinal alignment therewith are three in terior stop shoulders 2B—28—28, which serve to placed within the casing A by being inserted limit inward, movement of thefwedge block B, as throughthe open end thereof, the springs 39 and hereinafterpointefd'out. ‘ " ‘ ' ' ’ ' The wedge B is in the form of a block centrally recessed at the outer end, as indicated at 29, to‘ 10 provide a seat for the nut N3 of the coupler“ shank l1. At the sides thereof, the wedge‘ isv " provided with three projectingwedge faces 30 of substantially V-shaped transvers'ehrosssection. The wedge faces 30 are disposed symmetrically. 15 about the central longitudinal axis of the mech anism and converge inwardly'of the. casing to; ward said axis. The block B is also provided _ with three radially projecting lugs 3I—3l-—3! which are alternated with the _\_!-shaped wedge faces ‘thereof. Thejlugs' 3I—3|—3I are located at the inner end of the wedge block and in the ‘assembled condition of the mechanism are in 20 ddbeidg?rst placed‘iin position "therein. The shoes C—C--C are then placed on the spring 40 and forced inwardly to a predetermined extent, so that when the wedge B is placed thereon and turned to the position shown in Figure 4, the lugs 3|--3_|—3l thereof will clear and pass inwardly beyondthelugs 21—21—~21 of the casing when the Wedge. is pushed inwardly. The wedge is then placed in position on the inner spring and shoes, 2. spanner, or similar tool, ‘being engaged within the opening 33 of said wedge block B and notches 34—34 of said opening to hold the block against rotation. Whilethe shoes, are being held in said predetermined inward position, “the wedge is forcedinwardly and given a slight turn in contra; clockwise direction, as viewed in Figure 4, to bring the lugs 3! in alignment with the lugs 21 and in stops of the casing formed by the lugs 21 "and 25 back of the latter, as shownin Figure 2, and the ‘shoulders 28, and are engaged therebetween so pressure is then removed, permitting the mech that inward movement of the wedge, is'limited anism to expand and assume the position shown by engagement of the lugs 3| with the shoulders in Figure 3 with the lugs 3| of the wedge block 28 and outward movement by engagement with engagedlwith the lugs 21 of the casing. Outward the lugs 21. At the inner end, the block B is 30 movement of the Wedge is thus limited by, the provided with a substantially flat transverse ‘end lugs 21, the latter serving to hold the mechanism ‘face 32 which forms a spring seat. The block B assembled. As vwill be evident, the interengaging has a central opening 33 therethrough adapted arrangement of the V-shaped wedge faces of the to accommodate the shank I1 of the drawbar H5. wedge and shoes and V-shaped friction surfaces 'The walls of the opening are notched at diametri“ 35 of the shoes and. casing interlock the parts cally' oppositesides of the opening, as indicated against, relative rotation, thus preventing acci at 34, 'to cooperate with a spanner, or similar dental rotary displacement of the wedge from tool,- used in assembling the mechanism. cooperative relation with the retaining lugs 21 of "The friction shoes ,0, which are three in num the casing. her, are of substantially V-shaped cross section, 40 In the operation of the mechanism when a each shoe presenting a V-shaped wedge face 35 pulling force is applied to the drawbar, the wedge at the inner side thereof and a V -shaped friction B will be pulled inwardly of the casing ‘in unison longitudinal alignment with, the corresponding surface 36 at the outer side. The friction shoes with the drawbar, thereby forcing the wedge in C—C'—C are alternated with the lugs 21-21--21 wardly of thecasing against the resistance of the spring 39. Due to wedging engagement be of the casing and have the V-shaped‘friction surfaces thereof slidably engaged with the corre sponding friction surfaces of thecasing', the V shaped surface of each shoe engaging two adja cent surfaces 25—25 of the casing. The V-shaped wedge faces 35—35—35 of the shoes cooperate with the V-shaped wedge faces 30—3G-—39 of the tween the wedge and‘ shoes,‘the shoes are forced apart against the friction surfaces of the casing and carried inwardly along' said friction surfaces resisted by the spring 40. 'I‘he‘resultant com bined spring and frictional resistance‘ produced by this action provides the‘ desired high shock ab_ wedge block ‘13-. The wedge faces 35—35—35 of sorbing vcapacity. ' Compression of the 'mech the shoes are formed on lateral inward enlarge‘ anism is positively limited'by engagement of’the ments 31 on the shoes, the enlargement 31'of each lugsv 3| of the block B with the stop shoulders of ‘shoe presenting a flat face 38 at the inner end 55 the casing A, thus preventing the wedge B from thereof forming a ‘spring seat. ‘ " The springresista‘nce lltvhi'chv is preferably under initial compression, is disposed within the casing A and comprises a relatively light inner coil 39 and a, heavier outer coil 4%}. The opposite ends of the outer‘ coil lit bear respectively on the inner side of the end wall 22 of the casing and the spring seats 38 of the shoes C, and the opposite ends'of' the inner "coil bear, respectively, being drawn too far into the casing by the draw-v bar and protecting the springs against undue compression. When the actuating force is're duced, the springs 39 ‘and 40 restore all of the parts to normal position, outward‘ movement of the wedge being limited by engagement of the 111853! thereof with the stop lugs 21 of the casing. , We have herein ‘shown and described what we now consider the'preferred manner of carrying :o'n-is'aid wall 22 and the ?at end face 32 of the 65 out our invention, but the same is merely illus wedge block B. ‘ ' " trative and we contemplate all changes and modi V As clearly shown in Figures 1 and 2, the shank ?cations that come within the scope of the claims 11 of the drawbar extends through the casing A appended hereto. _ ' of the mechanism, the wall 22 of the casingibeing provided with a central opening 4| ther'ethroug‘h to accommodate the shank of the drawbar. The =‘drawbar shank extends through the opening lll, the inner coil 39 of the spring, and the opening 33 -'of the wedge block B, and is anchored to‘the latter by the nut I 8 accommodated in the seat 29 1. In a railway draft rigging for a railway car having a front stop, the combination with a fric tion casing having one end closed and the other ‘end open, said closed end bearing on the front stop of the car; of friction shoes having sliding engagement with the interior walls of said casing; 2,493,585 5 spring means opposing inward movement of said shoes; a block having wedging engagement with the shoes; spaced inner and outer stops on the casing; projecting stop lugs on said block en 6 tion casing open at one end, the other end of said casing being engageable with said stop, said casing having longitudinally extending, interior friction surfaces at said open end; of a central wedge block, a drawbar for actuating said wedge; gageable with said inner and outer stops for limit a plurality of friction shoes having sliding fric ing inward and outward movement of said wedge tional engagement with the friction surfaces of block; and a drawbar extending through said cas~ the casing and wedging engagement with said ing, spring means, and block and having shoul wedge block; spring resistance means yieldingly dered engagement with the latter to pull the same opposing inward movement of said wedge and 10 inwardly of the casing in draft. shoes; and inner stop means on said casing with 2. In a railway draft rigging for a railway car which the wedge block is directly engageable to having a front stop, the combination with a fric limit inward movement of the latter. tion casing open at one end and closed at the 5. In a railway draft rigging, the combination other end, said last named end bearing on‘ said with a front stop; of a drawbar; a friction casing front stop of the car; of friction shoes having engageable with said front stop, said casing hav sliding engagement with the interior walls of said casing; a Wedge block having wedging engage ment with the shoes; spaced inner and outer stops on the inside of the casing engageable with said wedge block limiting inward and outward move ment of said wedge block; a spring resistance within said casing comprising two coils respec tively opposing inward movement of said wedge block and shoes; and a drawbar extending through said casing and wedge block and having shouldered engagement with the latter to pull the same inwardly of the casing in draft. 3. In a railway draft rigging for a railway car having a front stop, the combination with a fric inwardly converging, interior friction sur faces; a friction clutch actuated by said drawbar having sliding frictional engagement with the friction surfaces of the casing, said clutch in cluding friction shoes and a central wedge block; interior stop shoulders on said casing with which said block has direct shouldered engagement to limit inward movement thereof; and spring means within the casing yieldingly opposing inward ‘4"; movement of said clutch. > 6. In a railway draft rigging, the combination with a front stop; of a drawbar; a friction casing engageahle with said front stop, said casing hav inwardly converging, interior friction sur tion casin g open at one end and closed at ‘the ad 1 l faces; a friction clutch actuated by said draw other, said casing having longitudinally disposed, and having sliding frictional engagement with inwardly converging, interior friction surfaces at the friction surfaces of the casing, said clutch said open end, said casing having the closed end including friction shoes and a central wedge there-of abutting said front stop; of a drawbar block; interior stop shoulders on the casing; having an elongated shank extending through outstanding lugs on said wedge block engageable said front stop and easing; friction shoes within with said stop shoulders for limiting inward the casing having friction surfaces of V-shaped, movement of the wedge block; and spring means transverse cross section engaged with the V yieldingly opposing inward movement of said shaped friction surfaces of the casing; a central wedge block mounted on said drawbar shank and 40 clutch. '7. In a railway draft rigging, the combination having wedging engagement with the shoes, said with a front stop; of a drawbar; a friction casing shoes and block having interengaging wedge faces having inwardly converging, interior friction sur of V-shaped, transverse cross section; inner and faces; a friction clutch actuated by said drawbar outer stops on the interior of the casing; laterally projecting lugs on said wedge block engageable 45 and having sliding frictional engagement with the friction surfaces of the casing, said clutch with said inner and outer stops for limiting in including friction shoes and a central wedge ward and outward movement of said block; means block; radial stop lugs on said wedge block; in on said drawbar shank having shouldered en terior stop shoulders on the casing with which gagement with the wedge block for forcing the said lugs are engageable for limiting inward same inwardly of the casing when a draft force movement of the wedge block; and spring means is applied to said drawbar; and spring means yieldingly opposing inward movement of said within the casing surrounding said drawbar shank and yieldingly opposing inward movement of said shoes and wedge block. 4. In a railway draft rigging for a railway car having a front stop, the combination with a fric clutch. GEORGE E. DA'I‘I-I. ROLAND J. OLANDER.