US2534433A - Shock absorber for railway car trucks - Google Patents

Description

Dec. 19, 1950 uc s 2,534,433

SHOCK ABSORBER FOR RAILWAY CAR TRUCKS- Filed Jan. 14, 1949 Patented Dec. 19, 1950 SHOCK ABSORBER FOR RAILWAY CAR TRUCK Henry Fuchs, Chicago, 111., assignor to W. H.

Miner, Inc., Chicago, 111., a corporation of Delaware Application January 14, 1949, Serial No. 7 0,959

Claims.

This invention relates to improvements in shock absorbers especially adapted for use as snubbing devices in connection with truck springs of railway cars.

One object of the invention is to provide a simple and efficient friction shock absorber, comprising a friction casing, friction shoes slidingly telescoped within the casing, and spring means yieldingly opposing relative movement of the casing and shoes toward each other, wherein the shoes are pressed against the friction surfaces of the casing by resilient means under compression reacting between the shoes to spread the same apart.

Other objects of the invention will more clearly appear from the description and claims hereinafter following.

In the accompanying drawing forming a part of this specification, Figure 1 is a transverse vertical sectional view of the improved shock absorber. Figure 2 is a horizontal sectional view, corresponding substantially to the line 22 of Figure 1. Figure 3 is a horizontal sectional view, corresponding substantially to the line 33 of Figure 1. Figure 4 is a side elevational view of the friction shoe at the right hand side of the improved shock absorber, as-illustrated in Figure 1, and looking from left to right in said figure.

My improved shock absorber, as illustrated in the drawing, comprises broadly a friction casing A, two friction shoes B and C, slidingly telescoped within the casing, a rubber block D, and a spring E opposing relative movement of the casing and shoes toward each other.

The casing A is in the form of a tubular member of cylindrical cross section, having a transverse top wall I0, projecting outwardly beyond the sides of the casing to provide an annular follower flange I I. The wall H] has a central opening l2 therethrough, adapted to accommodate the usual spring centering projection, not shown, of the top follower plate of a cluster of truck springs. The side wall of the casing is inwardly thickened at the lower end to provide a friction shell section 13 having an interior friction surface l4 extending lengthwise thereof.

The friction shoe B is in the form of an elongated hollow member, upstanding from a disc-like follower I5. The shoe B has vertical side walls l6--l6, a transverse back wall l1, and horizontal top and bottom walls 18 and I9, which extend outwardly beyond the side walls, the bottom wall 19 being formed by the central portion of the follower [5. The outer sides of the walls l6, l6, and I! present a, transversely curved, continuous friction surface 20, which extends lengthwise of the shoe B and fits the interior of the casing.

present fiat, interior, substantially parallel surfaces, and the back wall I! presents two laterally diverging, fiat surfaces, as shown most clearly in'Figure 3. The hollow shoe B is open at the left hand side, as viewed in Figures 1 and 3.

The follower I5 of the shoe B has an outwardly or downwardly opening, central recess therein which provides a seat 2| for the usual spring centering projection, not shown, of the bottom follower plate of the truck spring cluster.

The shoe C is in the form of a heavy block having a longitudinally extending, transversely curved friction surface 22 on its outer side, slidingly engaged with the friction surface M of the casing A. The shoe C fits between the projecting portions of the top and bottom walls l8 and I9 of the shoe B and is thus held against lengthwise movement with respect to the latter.

The rubber block D is housed within the hollow shoe B in back of the shoe C and is held under lateral compression by the shoe C, which has a substantially flat face 23 on its inner side bearing on said block.

The spring E is in the form of a helical coil surrounding the casing A and the shoes B and C, having its top and bottom ends bearing on the follower flange ll of the casing and the follower I5 of the shoe B, respectively. This spring serves to yieldingly oppose relative movement of the casing A and the shoes B and C toward each other.

My improved shock absorber replaces one or more of the spring units of a truck spring cluster, being interposed between the spring follower plates of said cluster. Upon compression of the cluster of truck springs between the spring follower plates, my improved shock absorber is compressed therewith, the casing A being forced downwardly toward the friction shoes B and C against the resistance of the spring E, thus snubbing the action of the truck springs by sliding frictional engagement of the shoes with the interior of the casing. Upon recoil of the truck springs, the downward pressure on the casing is reduced, thus permitting the spring E to expand and return the parts of the shock absorber to the normal position shown in Figure 1. Inasmuch as the compressed rubber block D constantly presses the shoes B and C against the friction surfaces of the casing, snubbing action is also produced during recoil of the truck springs.

I claim:

1. In a friction shock absorber, the combination with a friction casing having a follower at its outer end; of a pair of friction shoes slidingly telescoped within the casing, one of said shoes having a follower at its outer end, and a stop flange at its inner end, the other of said shoes having one end thereof abutting said last named follower and its other end engaged in back of said stop flange; spring means bearing at opposite ends on said followers for yieldingly opposing relative movement of said followers toward each other lengthwise of the mechanism;

and a rubber pad under lateral compression in terposed between said shoes for spreading the same apart into tight frictional engagement,

with the interior of the casing.

2. In a friction shock absorber, the. combi-na-- tion with a friction casing having a follower -at its outer end; of a friction shoe at one side of the mechanism having a follower at. its. outer:

end; a second shoe at the opposite side of the mechanism having shouldered engagement at opposite ends with said follower and first named shoe; a rubber pad under lateral compression interposed between said shoes, said 7 shoes being slidinglytelescoped withinthe casing; and spring means surrounding said casingand shoes and bearing at oppositeends on said followers, re-

spectively.

3. Ina friction shock absorber, the combination with a friction casing having a follower at its outer end; of a hollow friction shoe open at its inner side and having a friction surface atits outer side slidingly engaged with the interior of the casing at one side of thesame; a-

terposed between and bearing on said followersyieldingly opposing relative movement of the same toward each other.

4. In a friction shock absorber, the combination with a friction casing having. a. followerat its outer end, said casing beingopen at its inner end; of a. pair of friction shoes: slidingly telescoped within said open end of the casing, one

of said shoes having alaterally outwardly opening. pocket therein; a follower at the outer end of said last named shoe, the other shoe being seated in said pocket; a rubber pad underlateral compressionin said pocket bearing on the inner side of the shoe which is seated in said pocket to spread the shoes apart and force the same against the interior of the casing; and spring means bearing on said followers respectively for yieldingly opposing relative movement of said followers toward eachother.

5; Ina friction shock absorber, the combination with followers at opposite ends of the mechanism; of: an inwardly extending friction casing on one of said followers; an inwardly extending friction shoe on the other of said followers, said shoe having'a friction surface on its outer-side engaging the interiorof the casing at one side of the same; a second shoecarried by saidfirst named shoe, said first named shoe hav ing laterally inwardly extending, longitudinally spaced end walls overhanging and engaging the opposite ends ofsaidsecond named shoe, said second named shoe having sliding frictional engagement with the interior of the casingat the other side-:thereof; a rubber pad under lateral.

compression interposed between said shoes for spreading the same apart intotight frictional engagement with the interior-of the casing; and spring means bearing on said followers respectively for yieldingly opposing relative approach of said followers.

HENRY FUCHS.

REFERENCES CITED.

The following references are of record-in the" file of this patent UNITED STATES PATENTS Number Name Date 1,884-3520 f Barrows Oct. 25, 1932 2 ,216,231 Dentler Oct 1, 1940 2,242,413 Blattner May 20, 1941 2,319,078 Haseltine June 26', 19.45 2,388,230 Light l Oct. 38, 1945 2,141,680 Barrows Dec, 27:, 1948

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