US1689291A

US1689291A - o connor

Info

Publication number: US1689291A
Authority: US
Publication date: 1928-10-30
Anticipated expiration: 1945-10-30

Description

Oct. 30, 1928. 1,689,291

J. F. O'CONNOR FRICTION SHOCK ABSORBING MECHANISM Filed Jan. 31, 1927 2 Sheets-Sheet 1 1 Inverzfa:

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' J. F. OCONNOR FRICTION SHOCK ABSORBING MECHANISM Filed Jan. 51, 1927 2 Sheets-Sheet 2 kin a wmaa w A W 5 Patented Oct. 30, 1928.

UNITED STATES.

PATENT OFFICE.

JOHN F O'CONNOR, OF CHICAGO. ILLINOIS. ASSIGNOR TO W. H. MINER, INC., OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

FRICTION SHOCK-ABSORBING MECHANISM.

Application tiled January 81, 1827. Serial No. 164,885.

This invention relates to improvements in friction shoek alisorbinginechanisms.

()no object of the invention is to provide a friction shoi-lt ab orbing mechanism espel-ially adapted f r railway draft riggings including a spring eage. friction shell and friction system (0 operating with the shell, the shell and rag:- having limited movement to provide for initial sprin action, wherein the, shell is of simple design. lending itsel t to economic manulin-ture and is removable to pro-- vide for replacement of the shell by another when worn.

other and further bjects of this invention wi.l more fully and i-learly appear from the description and claims hereinafter fol lowing.

In the drawings, forming a part of this specification, Figure l is a horizontal longitudinal sectional view of a railway draft rigrging showing' my improvements in eonneetion therewith. Figure 2 is a front end elevational view of the shock absorbing merha nism proper. Figure 3 is a vertieal transverse seetioual view corr sponding substantially to the line 3 3 of Figure 1. And l'tigare 4 is a longitudinal vertieal sectional view of the front end portion of the shoek absorbing mechanism proper corresponding substantially to the line 4 l of Figure i.

In said drawings. 1t) 10 indicate ehannelshaped center or draft sills of a railway ear underframe, to the inner sides of wlneh are secured front stop lugs ll-ll and rear stop lugs 12-l2. The inner end portion of the drawbar is indicated by lil, to which is oper atively eonneeted a yololl of well known form. The sho h absorbing mechanism proper and a front main follower l! are disposed within the yoke, and the yoke and the parts tlierewilhin are supported in operative position by a detachable saddle plate lti fixed to the draft sills.

My improved SlHH'lt absorbing mechanism comprises broadly: a spring rage A; a l'rietion shell li; a wedge liloek a pair of frie tion shoes I) and l); a main spring resistance 1; and a retainer bolt (i.

The spring rage A is in the form of a. hollow hox-like rusting havin; a transverse end wall 17, longitudinally disposed vertiiail side walls l8-lt\ and horizontally disposed spaced top and bottom walls li -l. The end wall (Bo-operates with the star lugs l2 in the manner of the usual rear follower. The side walls as most clearly shown in Figure 1, converge forwardly of the mechanism and terminate in front end sections 20-20 which are substantially parallel to the longitudinal axis of the mechanism. At the unction between the main body portions of tilt! side walls 18 and the front end sections 20, the side walls are provided with inwardly projecting vertically dis osed stop flanges 2l21 which are ada to to co-o crate with the inner end of the riction shel B to limit lon itiulinal movement of the same inwardly of 1 1e cage.

'lhe friction shell B is in the form of a substantially rectangular box-like member open at its front and rear ends. The side walls of the friction shell which are designated by 22 are provided with interio longitudinally disposed friction surface 23-23 which eo-operate with the friction shoes I) and i i. The side walls 23 of the. shell are lon- 'gitudinally slotted as indicated at 24 to provide guideways for retaining elements 25-25 tixed to the spring cage, being riveted to the sections ill-of the side walls thereof. The retainin elements 25 are in the form of rivetliko members having enlarged cylindrical inner end sections 26 which work directly in the slots 24. The rivet-like retaining elements 26 extend through suitable openings in the side. wall sections 19 of the spring rage and have their outer ends upset so as to provide. rivet heads for securing the same to the cage. 11. will be evident that it it is desired to replace the friction shell B when worn by a new shell the riu-t-lihe retaining elements 25 may he readily removed by cutting oil the heads of the same. The slots ll in the side walls ofthe friction shell are of such a length that the enlargements 26 on the retaining elements will engage with the inner end walls of the slots, thereby limiting outward movement of the friction shell and that the outer end walls of the slots will be. engaged by said enlargements simultam-ously with engzng'ement of the rear end of the shell It with the stop flanges 21 ol the spring cage to limit inward nmrement. ol' the friction shell.

llpon reference to Figure i it will'be seen that the friction shell is loosely teleseoped' within the front end seetibu oi th spring rage A and that in its outermost position the shell has the front end thereot registering cagre at all times.

he wedge C is in the form of a hollow block begin a fiat front end face 27 hearing 'directly on t e inner side of the mam follower 15. At the inner end, the wedge block C is provided with inwardly converging Wedge faces 28 and 29 at the opposite sides thcreo f, the wedge face 28 being herein shown as disposed at a relatively keen angle with respect to the longitudinal axis of the mechanism and the wedge face 29 being shown as disposed at a somewhat blunter angle with respect to said axis.

The friction shoes D and E are disposed at opposite sides of themechzinism and are interposed between the wedge block C and the side walls of the friction Sllull 15. The two shoes D and E' are of similar design exce t as hereinafter pointed out. Each of t 10 shoes is provided with a longitudinally disposed outer flat friction surface 123 adapted to co-operate with the cofresponding friction surface 23 of the shell ll. At the inner side, each shoe is provided with a lateral enlargement 30 having a wedge face at the forward side thereof, the wedge face on the shoe D being designated by 129 and being correspondingly inclined to the face 29 of the Wedge and co-operating therewith and the wedge face of the shoe B being designated by 128 and being correspondingly inclined to the wedge face 28 of the wedge C and co-operating therewith. Rearwardly of the enlargements 30'the shoes D and E are provided with 5 need, inwardly projecting top and bottom anges 3131 as most clearly shown in Fig ure 3.

The main spring resistance F comprises an inner, relatively-light coil and an outer heavier coil. The outer coil has its opposite ends hearing directly on the inner ends of the friction shoes D and E and the end wall 17 of the spring cage. The inner coil of the spring resistance has the rear end thereof bearing on an inwardly projecting hollow boss 32 on the end wall 17. Tlie front end of the last named coil bears on the inner ends of the enlargements of the friction shoes. It will be seen that bythe arrangement disclosed, an ex ceptionally long spring resi ance element may be employed.

he retainer bolt G servcsjo hold the mechanism assembled and of overall uniform length, the head of the bolt being anchored within the hollow boss 32 on. the end wall 17 of the cage A and the nut of the bolt being anchored to the wedge block C, the same being disposed within the opening of said block. The retainer bolt G in addition to holding the parts assembled, also'serves to maintain the spring resistance'F under an initinl compression. It will be evident that due to this initial compression of the main spring resistspring resistance ance, the same is free to expand as the friction and wedge faces of the mechanism become worn, thereby compensating for wear of these parts.

The operation of my improved shock ab- 'of the mechanism. This action will continue until the movement of the shell B is stopped by engagement with the flanges or stop lugs 21 on the s ring cage, whereupon thefriction shoes will he forced to move onthe friction surfaces of the shell during the remainder of the compression stroke, thereby greatly augmenting the resistance offered to take care of relatively heavy shocks. tion will continue until the actuating force is reduced or the main follower 15 comes into engagement with the outer end of the spring cage, whereupon the actuating force will be transmitting directly through the follower Th described ac-- and the s ring cage, these elements acting as I a solid co umn load transmitting member to prevent undue compression of the main s ring resistance and deliver the shock directly to the draft sills.

When the actuating force is reduced upon release of the mechanism, the ex ansive ac-' tion of the main spring resistance will carry the wedge block and friction shoes outwardly, the shell B being also forced outwardly with these elements, due to the friction existing between the shoes and the shell. Outward movement of the shell will be arrested by enga ment with the stoprelements 25 whereupon 51 0 i will project the shoes and the wedge block C outwardly until movement of the wedge is arrested b the retainer bolt G. From the preceding escription taken in connection with the drawings, it will be evidentthat I have provided a friction shell of exceedingl simple construction which may be economics. ly manufactured and readily replaced by a new shell when worn, thereby adding materially to the life of the whole gear.

As hereinbefore pointed out, .in order to replace the friction shell B by a new shell, it is merely necessary to remove the vfiadge and friction shoes and then remove the rivets 25, thereby permitting the shell to be withdrawn, A new shell will then be inserted and secured by rivets 25.

While I have herein shown and described what I now consider the preferred manner of carry-mg out my invention, 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 friction shock absorbing mechanism, the combination with a sprin cageeleme'nt'; of a removable friction she 1 element telescoped within the cage element, said elements having relative movement limited to less-than "the 'full compression stroke of the mechanism;

stop means on the ca element for limiting inward movement of t e shell element; means for limitin outward movement of the shell element, said means including a fixed pin on a one of said elements workin'g'in' a sloton the other element; friction meansco-operating with the shell; and spring resistance means within the cage co-operating with the friction means.

2. In a friction shock absorbing mechanism, the combination with a spring cage; of a friction shell telescoped within the spring cage; means for limiting movement of the shell inwardly of the cage before the mechanism has been fully compressed; means for limiting outward movement of the friction shell and maintaining said shell housed with- 'square section at one e day of January, 1927.

in the ringcage; friction means co-operatmg wit the shell and adapted for movement with t thereto; and means for yieldinginwardly of the cage.

1y resisting movement of said friction means 3. In a friction shock absorbing mechani m, the combination with a sgring ca e having a n thereog; of a rec-- tangular friction shell telescoped within said square end section of the cage; stop shoulders on the cage for arrestin inward movement of the shell after a pre etermined compression of the mechanism a pairof friction shoes co-operating with the shell and'movable rela tivelygethereto after movement of the shell has en. arrested; a. wedge block having wed engagement with the shoes; means for 'miting outward movement of the shell including sto elements fixed to the cage and en g wi 'in limiting slots in the shell; an spri resistance means. opposing move ment of t e shoes and shell inwardly of the I cage.

In witness that I claim-the fore ing I have hereunto subscribed my name is 26th JOHN ocoimoa