US2047732A - Brake beam strut bushing - Google Patents

Description

July 14, 1936. I v H HARaEFgT 2,047,732

BRAKE BEAM STRUT BUSHING Filed Oct. 29, 1954 Patented July 14, 1936 BRAKE BEAM STRUT BUSHING Victor H. Harbert, Chicago, Ill., assignor to Illinois Railway Equipment Company, Chicago, Ill., a corporation of Illinois Application October 29, 1934, Serial No. 750,508

101mm v(c1. 1ss-2s1) V My invention relates to bushings whereby the strutsjof the brake beams of a railroad carwill be relieved of the wear usually encountered by theni ovements of the pins whereby one of the levers of the brake mechanism is pivotally mounted in the strut of the beam. I V V In practice, certain of the levers of the'brake mechanism are pivotally secured in a transversely disposed slot in the strut of the brake beam by means of loosely held pins which are free to oscillate in the pin-holes .oi the strut, with the result that the holes in the strut (one in each bifurcation or side wall on opposite sides of the lever receiving slot) become worn and enlarged, allowing improper play and positioning of the brake beams.

As the relative movement between the pins and the struts of the brake beams is exceedingly frequent, the wear on the struts is more or less rapid. This necessitates a dismantling of the beams and the removal and discarding of the struts, incurring considerable expense and delay.

The object of my invention is to provide a wear-resisting bushing which may be readily formed of suitable tempered metal and which can be easily applied to the pin receiving openings in the strut without alteration of the latter and without difficulty.

Another object of my invention is to provide a bushing whose relation with the strut is such that the bushing will be held against movement or rotation and whereby a standard sized pin may be employed.

The objects and advantages of my invention will all be readily comprehended from the following detailed description of the accompanying drawing wherein:-

Figure 1 is a side elevation of a brake beam, one end being broken away and with my improved bushing applied.

Figure 2 is a cross-sectional view taken substantially on the line 2-2 of Figure 1.

Figure 3 is a sectional View taken along the line 3-3 of Figure 2, looking in the way of the arrows.

Figure 4 is a perspective view of one of the bushings shown in Figure 2.

Figure 5 is a view similar to Figure 2, illustrating a modification of the bushing; while Figure 6 is a side elevation of the same.

For purposes of exemplification I have shown a well known type of brake beam provided with the strut l0 provided with the usual elongated slot l I adapted to receive the lever i2 of the brake mechanism; this lever being pivotally held in place by a suitable pin l3 which extends through suitable registering holes made in the bifurcated portion or side walls of the strut disposed on opposite sides of thelever receiving slot H.

As there is'almost constant relative movement between the strut and thepin, the pin Win a 5 comparatively brief period of time causes the holes in the strut ill to be soworn that animproper relation between the lever 12 and the brake beam occurs which interferes'with proper brake application and necessitatesa dismantling 10 and discarding of the strut although, excptfor theworn holes, otherwise still in serviceable con; dition. As can readily be understood, this-results in considerable expense and delay or los's of car service. 1

My invention is designed to overcome this difficulty and expense by providing means which may equally as well be employed on new struts and on old or partially worn struts and in the particular exemplification of the invention as 20 disclosed in the first four figures of the invention it consists of a steel annular member or bushing I [4 formed from a single piece of metal with the ends arranged in abutting relation as shown more clearly in Figure 4.

In order that these ends may resist any transverse strains, I prefer to provide one end with an extension or lobe as at l5; while the other end is provided with a corresponding indentation at It adapted to receive the lobe l5 and thus prevent lateral movement of either end relative to the other.

The bushing M, at a point preferably diametri-- cally opposite the split portion. and at one end, is provided with an integral radially disposed lug 35 II. This lug ll is adapted to extend beyond the perimeter of the pin receiving hole in the strut and prevents the bushing from moving outwardly from the pin hole in the strut.

The bushings are inserted in the pin-holes in the two- Walls of the strut from the inner ends of the holes adjacent the lever l2, with the lugs I! made to lap the walls of the-struts. The lever l2, of course, prevents inward movement of the bushings l4, while the lugs ll, overlapping the perimeter of the pin-holes, will prevent outward movement of the bushings.

In order to prevent any rotative movement of the bushings through rotative movement of the pin I3, I prefer to cut a small slot on the inner 5 faces of each of the two side walls or bifurcations of the strut, as at it, adapted to receive the lips or lugs II as shown in Figure 2.

After the bushings i l have been inserted in place in the manner hereto-fore stated, the lever 5 I2 is then put through the slot in the strut and pivotally secured in place by the usual pin [3, one end whereof is provided with a head l3 while the other end has an opening to receive a suitable cotter pin as at l9.

It is apparent from this construction that all wear caused by the relative movement of the pin l3 in the strut will be taken entirely by the bushing 14 and hence prevent wear on the openings in the strut, with the result that the life or usefulness of the strut is greatly enhanced. In the event the bushing becomes worn, it is apparent that it may be readily replaced at a comparatively small expense.

This type bushing is equally adapted to old as well as new struts; the slots 18 being readily cut or otherwise formed in an old strut; or initially molded in new struts.

In Figures 5 and 6 I illustrate a modification adapted more especially to new struts, wherein the holes in the bosses or side walls 20, 20 of the strut on each side of the lever receiving slot are screw-threaded at 2| to receive the threaded bushings 22 which are preferably of continuous construction with the outer ends of the bushings provided with the laterally disposed lugs at diametrically opposite points as shown at 23.

This type of bushing is inserted from the outer ends of the pin-holes; the bushings being screwed into place by means of some suitable tool placed between the oppositely disposed lugs 23, 23 and the bushings completely screwed into place until farther inward movement is made impossible by the lugs 23.

This bushing is made to receive the standard length pin, the head of which at opposite sides, corresponding with the position and size of lugs 23, 23, is flattened or removed to permit the head of the pin 13 to fit between, the lugs 23, 23 of the bushing.

I have shown and described my improved bushings as especially applicable to the struts of brake beams, but it will be understood that the bushings are equally well adapted to other uses or in other situations where a wear receiving element of this type may be employed, and I do not wish to be understood as limiting myself merely to the use in connection with the struts of brake beams; furthermore, certain modifications are possible and may be made without, however, departing from the spirit of my invention.

What I claim is:

A strut bushing of the character described comprising, in combination with a brake beam strut having an elongated lever receiving slot and an intersecting pin receiving hole, the inner walls of the strut adjacent the pin holes each having a slot, a cylindrical wear receiving member of width corresponding to the thickness of the wall of the strut on each side of the lever slot and adjacent the hole and adapted to receive the lever holding pin and insertible through the lever receiving slot, each of said members at one of the ends being provided with a radially disposed lug adapted to enter said slot whereby rotative movement of the wear receiving member is prevented.

VICTOR H. HARBERT.

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