US740429A

US740429A - Draw-gear and buffing apparatus.

Info

Publication number: US740429A
Application number: US9305402A
Authority: US
Inventors: Edwin M Herr
Original assignee: Westinghouse Air Brake Co
Current assignee: Westinghouse Air Brake Co
Priority date: 1902-02-07
Filing date: 1902-02-07
Publication date: 1903-10-06
Anticipated expiration: 1920-10-06

Description

No. 740,429.5 R PATRN'TRD 001.6, 190s.'

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PATENTBDOGT. 6, -190Bf E. M.' HERR. DRAW GEAR AND BUPPING APPARATUS.

-APPLIU'AJIOISI FILED FEB. 7. 1902..

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E. M. HERR. l DRAW GEAR AND BUPFING ANAH-MUS.

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UNITED STATES *facetten october e, i90/. l PATENT OFFICE. i

EDWIN M. HERR, OF PJTTSBURG, PENNSYLVANIA, ASSIGNOR TO THE WEST- INGHOUSE AIR BRAKE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

DRAW-GEAR AND BIUFFING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 740,429, dated October 6, 1903.

Application tiled February 7, 1902. Serial No. 93,054. CNO modell:

To all whom, t may concern,.-

Be it known that I, EDWIN M. HERR, a citizen of the United States, residing in Pittsburg, county of Allegheny, State of Pennsyl- Vania, have invented or discovered certain new and useful Improvements in Draw-Gear and Buing Apparatus, of which improvement the following is aspecification.

This invention relatesto railway draft ap- .l o pliances forresistin g and taking up the shocksV liminary or initial spring resistance element"4 which will check the first part of the draw;4 bar movement and be subjected to strain in' advance of the main resistance element, to which the force of the greater strains istransmitted through the movement of. the, friction-blocks. i v Another object of the invention is to provide such an apparatus with an additional frictional device operated by the preliminarymovement of the draw-bar.

A further object of the invention is to pro- 'vide means foi` clamping the housing and friction-blocks together during the preliminary movement of the draw-bar.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a vertical horizontal section of my improvement, taken on thelinea: fr of Figs. 2 and 3. Fig. 2 is a horizontal section taken on the line w w of Fig. 3. Fig. 3 is a transverse section taken on the line y fy of Figs. 1 and 2. Fig. 4 is a transverse section taken on the line z z of Figs. 1 and 2, the draft-siils being omitted. Fig. 5 is a horizontal section showin g a modified form of my improvement. Fig.'

` 'so 6 is a transverse section taken on the linee u of Fig. 5, the ecnter wedge-blockbeing removed. Fig. 7 is a detail view showing one `of the center wedge-blocks. Fig. S is a vertical longitudinal section of the form of gear illustrated in Fig. 5, but shows a modified construction of the preliminary resistancespring; and Fig. 9 is a transverse section taken on the line't t of Fig. 8.

The construction shown on Sheet 1 of the drawings will now he described.

The numeral 1 denotes 'the' sills or drafttimbers of car-frame to which my improved draw-gear and bufng apparatus may be secured in any desirable manner. As shown in the drawings, the draft-lugs 2 and 3 are secured in pairs to the sills, and the connecting-plate 4 is provided to support the drawgear. The draw-bar 5 has the usual strap 6 attached thereto and extending aroundthe follower-plates 7 and 8. Between the followerplates is located the improved friction drawfgear comprising a barrel casting or housing 9, carrying the main yielding resistance element or twin spring 10 and the friction-

blocks

11, 12, and 13. The housing 9 is substantially cylindrical in shape, the exterior being provided with a series of longitudinal strengthening-ribs 18 and its forward end being dared outward on two opposite sides, providingftwo inclined faces 14 and 15, which cooperate with the corresponding faces of the triangular-shaped friction-blocks 11 and 12, respectively. Secured on the outside of the barrel casting or housing 9- and preferably cast integral therewith are the hollow cylindrical projections 16, preferably four in number, arranged at the four opposite corners, as shown, and containing the preliminary resistance-springs 19 land plungers 20, which extend out of the ends ofV said cylinders and engage the follower-'plate 8. In the upper and lower inner faces of theared end of the housing containing the frictionblocks are arranged the recesses 21, in which are located the wedge-

blocks

22 and 23, and g5 the rods 17,'having heads 24 at one end thereof engaging the preliminary springs 19, extend into engagement with the wedge-blocks 22 at their opposite ends. These wedge-

blocks

22 and 23 are located opposite the upper and ico lower faces of the friction-blocks 11 and 12, so as to clamp the said friction-blocks and housing together during the preliminary movement of the draw-bar and tovncrease the friction between said blocks and hous- Aing during the subsequent movement of the draw-bar or pressure-transmitting vmember. When the parts are in their normal or release position, as shown in the drawings, there is an open space between the rear end of the housing 9 and the follower-plate 8to allow for an initial movement of the drawbar or pressure transmitting member and a corresponding preliminary spring resistance beforethere is any material resistance exerted by the main resistance-spring 10 or any relative movement of the friction members. There is also a space between the flared end of the housing and the followerplate 7 to allow for the subsequent movement ofthe d raw-bar in the transmission of greater strains when the friction-blocks move into the end of the housing and the pressure is vtransmitted through them to the main resistance element or twin spring 10. The operation of this form of my improved construction during the act of pulling is as follows: The initial movement of the draw-bar and strap or pressure-transmitting member forces the follower-plate 8 against the plungers 20, compressing the preliminary springs 19 between said plungers and the heads 24 of the rods 17 and clamping the housing to the friction-blocks 1l and l2 by means of the

wedgeblocks

22 and 23. The faces of these wedgeblocks are so inclined that the housing will alwaysbe clamped to the friction-blocks during the preliminary movement of the drawbars -and until the clearancespace is closed, thus preventing any relative movementof the friction-blocks during the preliminary movement. This initial or preliminary pressure is resisted by the preliminary springs 19, which have a resistance capacity sufficient to check and' take up the minor strains and shocks to which the device may be subjected. Upon the application of greater strains and a further movement of the draw-bar the follower-plate 8 engages the end of the housing 9 and forces the same forward, causing the friction-blocks ll and l2 to move transversely toward each other and into the housing and by their inclined faces forcing the center block 13 backward against the main resistance-spring 10, which thus exerts its action in alinement with the movementl of the drawbar. This subsequent movement is also resisted by the increased friction between the upper and lower faces ot' the friction-blocks 1l and 12 and the wedge-blocks 23, which are clamped against these faces by the preliminary movement of the draw-bar and the force of the spring, 19. Although the main resistance-spring lO is slightly compressed during the preliminary movement in which the clearance-space is closed, its resistance to this movement is very small, since in this position tion, as shown in the drawings.

it is extended to nearly its full length and nearly all the p reliminary strain is taken up by the short preliminary resistance-springs 19.

During the operation of bufiing the action of the apparatus is substantially the same as in pulling except that the pressure from the draw-bar is imparted to the follower-plate 7, which moves backward, together with the friction-blocks and the housing, there being no relative movement among these parts during the preliminary movement in whichthe clearance-space is closed. The preliminary Wmovement in bufting clamps the Wedge-blocks 23 against the opposite faces of the frictionblocks and is checked by the resistance of the springs 19, and the further or subsequent movement of the buer, due to the greater strains, forces the friction-blocks into the housing, compressing the main resistancespring .10, the action being the same as in the case of draft strains.

It is to be noted that the friction-blocks are interposed between the draw-bar or pressuretransmitting memberand the main resistancespring, so that the greater strain, due to the subsequent movement of the draw-bar in both draft and buflng, is transmitted to said main resistance-spring through the relative movement of the friction-blocks and housing.

According to the modified construction shown in Figs. 5, 6, and 7 two

oppositelyarranged housings

25 and 25 are secured to the draft-sills in any desired manner-as, for

IOO

instance, by means of the cheek-plates 27.

rlhe housing 25 contains the follower-plate 28 and wedge-shaped friction-

blocks

29, 30, and 3l, While the housing 25 carries the col'- respondng follower-plate 28' and frictionblocks 29, 30', and 3l. Between the followerplates is located the main resistance-spring 26. The strap 6 of the draw-bar 5 extends around the housings and the end wedge- -push-rods engage the drawbar 5 and the strap 6, respectively. Light springs 34 and 34 are located around the outer ends of the push` rods and in recesses in the respective wedge- `blocks 3l and 3l', for the purpose of keeping the inclined friction-surfaces of the wedgeblocksin contact vwith each other a't times when the parts are in normal or release posi- The housings are provided with inwardly-flaring walls, which engage the inclined surfaces of the two side wed ge-shaped friction-blocks as they are lIO forced against the same by the middle wedgei block, which is actuated by the draw-bar, strap, or other pressu re-transmitting member. In buiing the initial movement of the drawbar is transmitted directly through push-rod 32 and collar 33 to the preliminary resistance spring 24. As the draw-bar moves inward the lightspring 34 is compressed into the recess in the wedge-block 31, so that when the buflng strain is greater than can be resisted by the preliminary spring 24 the draw-bar then engages the wedge-block 3l, forcing the same between the Wedge-

blocks

29 and 30, which move transversely against the inclined walls of the housing and transmits the pressure.

movement as the friction members enter into action.

In Figs. 8 and 9 I have shown a modified construction of the preliminary-spring device as applied to the'formof spring-.gear and friction-blocks illustrated in Fig. 5. The central push-rods and preliminary spring are dis-l pensed with and in their place two preliminary springs 39 are located on rods 37, having collars 38 and adapted to actuate the- Wedge clamping-blocks 35 and 3G, which are located in recesses in the middle friction-block 31, as shown.

The rods 37 are guided in openings in the draw-bar, and the middle friction-block 31 is provided with a boss or projection 40 to engage the draw-bar after the preliminary movement in bufting. During the initial or preliminary movement the

wedges

35 and 36 are clamped, thus holding the friction-block 3l and the housing 25 rigidly together while the preliminary springs 39 are compressed. Then upon a further movement, due to greater buffing strains, the draw-bar engages the projection 40 of the middle wedge friction-block 3l and forces the side friction-

blocks

29 and 30 transversely against the inclined sides of the housing 25 and lineally against the follower-plate 28 and main resistance-spring 26.

The wedge-

blocks

35 and 36 are actuated by thepreliminary movement of the draw-bar and the compression ofthe springs 39 to give additional friction between the housing and the middle block 3l during the further or subsequent movement of the draw-bar. The parts are duplicated at the opposite end of the apparatos, as indicated by the primed referencenumerals, and a similar action takes place in During draft strains aY resisting draft strains. This construction, therefore, provides not only a preliminary spring-resistance, but also an additional fric- 4tional resistance, the same as is secured by the construction shown in the first sheet of drawings.

Having now described myinvention, what I claim, and desire to secure by Letters Patent, is- 1 l. In a draw-gear or bufingapparatus, th

combination of a draw-bar, a preliminary yielding resistance'element, a main yielding resistance element arranged to exert its action in alinement with the movement of the draw-bar, and friction members interposed between said main resistance element and the draw-bar. y

2. In a draw-gear or buiing apparatus, the combination ofa draw-bar, a preliminary spring resistance element, a mainspringre-v lsistance element, both of said resistance ele- 4. In a draw-gear orbuiing apparatus, theV combination of a draw-bar, a spring resistance element, friction members interposed between the draw-bar and said spring resistance element, anda wedging device adapted to exert pressure against the said friction members by the preliminary movement of the draw-bar.

5. In a draw-gear or bufling apparatus, the combination with a draw-bar and a main resistance-spring, of friction members interposed between the draw-bar and said spring, a preliminary resistance-spring and means actuated by saidv preliminary spring for increasing the friction of said members.

6. In a draw-gear or bufting apparatus, the combination of a preliminary spring resistance element, a main spring resistance element arranged to exert its action in alinement with the movement of Ythe draw-bar, friction members interposed between said main resistance element and the draw-bar, and a housing for said friction members.

7. In a draw-gear or bnfiing apparatus, the combination of a draw-bar, a spring resistance element, friction members interposed between the draw-'bar and said resistanee'element, a housing for said friction members, and means actuated by the preliminary movement of the draw-bar for increasing the friction between thehousing and said friction members.

8. In a draw-gear or bufting apparatus, the

combination of a draw-bar, a spring resistance element, friction members interposed between the draw-bar and said resistance element, a housing forsaid friction members and a wedging device inserted between said housing and said friction members and actuated by the preliminary movement of the draw-bar.

9. In a draw-gear or buing apparatus, the combination of a draw-bar, a main resistancespring, friction members interposed between the draw-bar and said spring, a housing for said friction members, a preliminary resistance-spring and means actuated by said preliminary spring for increasingthe friction between the housing and the friction members.

10. In a draw-gear or buffing apparatus, the combination of a draw-bar, a main resistancespring, friction -blocks interposedbetween the draw-bar and said spring, a housing for said friction-blocks, a preliminary resistancespring, wedge-blocks adapted to be clamped between the housing and friction-blocks by the preliminary spring during the initial movement of the draw-bar.

ll. In a draw-gear or bufing apparatus, the combination of a draw-bar, a spring resistance element, friction members interposed between the draw-bar and said resistance element, a housing for said friction members, and means actuated by the preliminary movement of the draw-bar for clamping said friction members to the housing.

l2. In adraw-gear or buffmg apparatus, the combination of a draw-bar, a main resistancespring, friction members interposed between the draw-bar and the said resistance-spring, a housing for said friction members, a preliminary resistance-spring, and a clamping device actuated by said preliminary spring for holding the friction members and the housing together during the preliminary movement of the draw-bar.I

13. In a draw-gear or bufng apparatus, the combination of a draw-bar, a main resistancespring, friction members interposed between `the draw-bar and said spring, a housing for said friction members,preliminary resistancesprings, wedge-blocks bearing against opposite faces of said friction members, and means EDWIN M.V HERR.

Witnesses:

E. A. WRIGHT, R. F. EMERY.