US2067596A - Brake beam support chair - Google Patents

Description

Jan. 12, 1937. E, uss

BRAKE BEAM SUPPORT CHAIR Filed Dec. 24, 1934 3 Sheets-Sheet l l/vvs/vroie 010/1 50556 j Q fir OPNEY Jan. 12, 1937. E. G. BUSSE BRAKE BEAM SUPPORT CHAIR Filed Dec. 24, 1934 I 3 Sheets-Sheet 2 IN vex/7'02 Zia W? 5055a E. G. BUSSE BRAKE BEAM SUPPORT CHAIR Jan. 12, 1937.

Filed Dec; 24, 1934 3 Sheets-Shet 3 j/vvg/vroz f/W/h g uss Patented Jan. 12, 1937 UNITE. STATES PATENT OFFICE BRAKE BEAM SUPPORT CHAIR corporation of Illinois Application December 24, 1934, Serial No. 758,986

16 Claims.

. This invention relates to guards, guides, or supports for railway brake beams and consists particularly in novel chair structure for providing a sliding bearing between the beam and an underlying guard, guide, or support strap.

Where a brake beam is equipped with an underlying auxiliary third or fourth point guard, guide, or support, a separately formed bearing on the beam, called a chair or shoe, is usually 1o provided to slidably engage a strap carried beneath the beam by the truck spring plank or other convenient part. Fourth point support chairs, in particular, should be adjustable angularly and laterally. relative to the beam due to variations in the shape, height, and position of the support strap, height of the beam, etc. A simple bearing element or chair having pivoted or flexing jaws for gripping the tension member of the brake beam is usually provided so as to 20 facilitate the necessary adjustment.

It has been found that this simple type of fourth point support chair tends to rotate on or slide along the tension member in spite of the clamping elements, thus working off from the support strap so as to become inoperative. Special hand wrenches and power tools have proven unavailing for properly seating the chair clamp and where the chair is improperly tightened, as is frequently the case, this disadvantage is aggravated. Warpage in cast or forged chairs, which it is almost impossible to prevent, also hastens the loosening of the chair so as to render the same ineffectual. Special tapered clamping pins and bolts have failed to overcome the above diificulty as have inserts of hardened steel and serrated structure applied to the clamp jaws for biting into the metal of the tension member. Fourth point support chairs attached to both the tension and compression members of the 40v beam will remain rigid therewith, but such a chair cannot be adjusted and for this reason is not particularly desirable. Deformed and angular tension members are undesirable for the same reason. 45, In case of third point supports, a chair, similar to the simple form of fourth point chair referred to above, is clamped to a round pin immovably seated in special lugs or ears projecting from, the front end of the strut. This chair also tends to rotate on the ear pin due to constant vibration. In a copending application Serial No. 755,686, filed December 3, 1934 in the names of Edwin G. Busse and Herbert W. Ekholm, is illustrated a universal form of third point support chair which may be securely and rigidly fastened to a truss type beam without a special strut, but this chair is somewhat more complicated than the simple clamp type chair.

One object of the present invention is to provide a brake beam support chair which can be 5 easily applied to brake beams so as to retain its proper adjustment indefinitely.

Another object is to provide a brake beam support chair which can be rigidly and permanently clamped to the beam, but which may be freelyadjusted as required.

Another object is to provide a novel adjustable brake beam support chair which will retain its proper adjustment and position on the beam even though improperly tightened. 15

These objects and other more detailed objects are attained substantially by applying between the third or fourth point support chair jaws and the part of the brake beam clamped therebetween, a frictional insert formed of material, such as rubber, having a substantially higher coefficient of friction with the metal of the beam part than the metal clamping jaws, as opposed to structure depending for its gripping power upon hard or sharp elements which penetrate the surface of the tension member.

In the accompanying drawings illustrating the invention Figure l is atop view of a part of a railway truck spring plank and truss type brake beam.

Figures 2, 6, 9, 11, 12, 13, 14, 15, and 1'? are vertical sections through brake beam third and fourth point support chairs illustrating various forms of the invention.

Figure 3 is a transverse section taken on the line 3-3 of Figure 2.

Figures 4 and 51 are views corresponding to Figure 3 but illustrating modifications.

Figure 7 is a horizontal section taken on the line l--! of Figure 6. 40

Figure 8 is a detail view of a modified form of frictional insert.

Figure 10 is a side view of a portion of the beam tension member in Figure 9.

Figure 16 is a sectional view of another form of frictional insert.

Figure 18 is a detail view of one of the inserts in Figure 17.

Figure 19 is a top view illustrating a third point support chair embodying the invention, the brake beam being illustrated in dot and dash lines.

Figure 20 is a side view, sectioned in part, of the chair in Figure 19.

Figure 21 is a vertical section illustrating another form of third point support chair and is taken on the line 2l-2l of Figure 22.

Figure 22 is a top view of the third point support chair in Figure 21.

Figures 23 and 24 are partial views, partly sectioned, of brake beam support chairs embodying still other forms of the invention.

Figures is a sectional view taken on the line 25-25 of Figure 24.

Figure 1 illustrates a brake beam including the compression member I, strut 2 having a slot 3 and pinholes 4 for the usual brake lever (not shown), and tension member 5-of cylindrical or round section. Attached to the spring plank 6 by means of the brackets l'are the I fourth point guard, guide, or support straps B extending beneath the brake beam between the strut 2 and the brake heads (not shown) at each end thereof. Clamped to the tension member 5 by means of clamping bolts 9a are the fourth point support chairs or shoes 9 which slidably engage the straps 8.

The fourth point support chair, shown detailed in Figure 2, includes the enlarged bearing portion ll] for engaging the underlying supportstrap and the pivoted arcuate jaws H and I2 pinned together at l3. At the upper extremities of the jaws II and 12 are the apertures l4 and I5 for receiving a bolt (see 'Fig. 1) for clamping the jaws II and I 2 about the beam tension member 5. The inner surfaces of the jaws II and 12 are recessed and provided with the inserts l1 and [8, preferably of live rubber, for engaging the tension member to assist in maintaining the chair rigidly assembled therewith.

The jaw recesses are preferably undercut, as; at. 19 (Fig. 3), and the rubber inserts made of tapering form, as the insert l8, so as to be self secured therein. The inserts are compressed in application to the jaw recesses. The inserts I1 and 18 may be specially molded or formed of flat strip material, and preferably will be distorted longitudinally and laterally and also flexed in insertion into the jawrecesses so as to be securely held therein.

Figure 4 illustrates another manner attaching the inserts to the support chair jaws. In Figure 4 the insert 29 is attached within the recess 2| in the jaw 22 by means of a rivet 23. The-recess 2| is substantially larger than the insert 29 so as to permit expansion of the insert under pressure. I

In Figure 5, the insert 24 is attached to the chair jaw 25 by a glue or cement substance 26.

Figures 6 and '7 illustrate another type of frictional insert applied to the pivoted jaws 21 and 2B of a support chair. The pivoted jaws have interengaging lugs 29 and 30 receiving the pin 31. The inserts 32 and 33 have interengaging' apertured lugs 34 and 35 through which the pin 3| also extends for securing the inserts 32 and 33 within the recesses 36 and 31 in the chair jaws. The inserts 32 and 33 are provided with the suction cups or recesses 32a .and 33a for increasing the frictional resistance between chair jaws and the clamped beam member. If desired, the inserts 32 and 33 may be form'ed'integrally' as the jaws 38 and 39 in Figure 8, having 'an apertured lug 40 for receiving the pivot pin to secure the insert in position. Jaw recesses 36 and 31 provide for expansion of the inserts 32 and 33, as in Figures 3, 4, and 5.

In Figure 9, the beam tension member 4| is. recessed at 42 and provided with a. frictional insert 43, preferably of rubber, which is disposed to be engaged by one of the pivoted jaws 44 of the fourth point support chair generally indicated at 45. The chair in this form of the invention will be as rigidly secured in position as the chairs in the previous forms, but cannot be adjusted longitudinally of the tension member unless the insert 43 is made of substantial length.

In Figure 11, one of the pivoted jaws 46 of the fourth point support chair has a restricted undercut recess 41 within which is applied the frictional insert 48 which is distorted in application thereto so as to be self maintained within the recess. The other jaw 49 is deformed, as at 49a, and provided with an undercut recess 50 within which is applied the bulbous nubbin portion 51 of the frictional insert 52. The nubbin 5i secures the insert within the jaw recess.

In Figures 12, 13, 14, and 15, the fourth point chair is formed as a unitary metal member having flexible jaws. In Figure 12, the jaw portions 53 flex about the narrow neck 54 connecting the same with the bearing portion 55 of the chair. Frictional insert 56, also formed in one piece, has a bulbous nubbin 51 applied to the undercut recess 58 in the lower part of the shoe. In Figure 13, the insert 59 is formed of a strip of rubber and is crimped at 60 to form a bulbuous projection for application to the undercut recess 61 in the lower part of the chair 62. In Figure 14, the insert 63 has a lug 64 provided with an aperture 65 by means of which the insert may be pinned within the recess 56 in the lower part of the support chair 61. In Figure 15, each jaw 68 is provided with a rubber insert 69 with a portion compressed within the undercut recess m of the jaw and another portion terminating in the recess H in the lower part of the chair. The inserts are secured to the chair jaws by rivets i2. In each of Figures 12, 13, and 14, the

rubber inserts are self secured to the chair, but these may be additionally cemented or riveted thereto if desired.

Figure 16 shows another frictional insert 13 formed as a portion of a circle and having suction cups 14, as in Figure 6. The insert is cemented or riveted to the chair jaws.

In Figures 17 and 18, the jaws 15 have bosses 16 with apertures 71 enlarged at their outer ends for receiving the button-like head portions 18 of the projections E9 on the inserts 8B and 86a.

This type of insert may be easily snapped into position in the jaw recesses. The recess 15a in the right hand jaw is larger than the insert 88a received therein, as in Figures 4 and 5, to permil; expansion of the insert under pressure. The insert 8411. also has suction cups 8%, as in Figures 6 and 16. Preferably the inserts in both jaws will be identical in practice.

Figures. 19 and 20 show in broken lines the front extremity of a brake beam strut 8! having ears or lugs 82 projecting forwardly of the tension member 83. Clamped to the pin 84 ex-' third point support chair as'more clearly illustrated and described in the above-mentioned copending application Serial No. #155,686, fi led December 3,: 1934. Thechair includes a broad bearing portion 89 for engaging the guard, guide, or support strap 90 and rigid jaws 9i and 91. for receiving the beamtension member 93 therebetween and apertured for receiving the extremities of U-bolt 94 secured therein by the nuts 95 and for clamping about the beam strut 96. Applied to a suitable undercut recess 91 in the inner surface of each pair of jaws is a rubber insert 98 for frictionally engaging the tension member 93 and having a projection 99 with an enlargement I to be inserted through the aperture I0'I for securing the insert in position.

In each of Figures 23, 24, and 25 one jaw only is shown of a support chair similar to that in Figure 2. The jaw I02 in Figure 23 has a cylindrical pocket I03 receiving the coiled spring I04 and the boss I05 on the insert I06. Insert I06 engages shoulders I01 on the chair jaw to maintain the assembly with spring I04 under compression.

In Figures 24 and 25, the jaw I08 has a laterally elongated pocket I09 receiving the flexed strip spring IIO which bears against and is secured to the insert III. As in Figure 23, the insert is disposed to yieldingly engage the gripped beam part so as to maintain the beam and chair tightly assembled in case of loosening of the clamping bolt or bending of the chair jaws due to vibration and constant pressure. Also the yielding or resilient spring pressed inserts facilitate attachment of the chair to a beam part which is too small for the chair jaws. The resiliently mounted inserts are preferably of frictional material as in the previous forms.

The novel pliable or resilient inserts will hold the chairs rigidly in positiori even though the clamp is not fully tightened. The inserts do not deteriorate rapidly, as might be supposed, the applicant having successfully utilized live rubber at least fifteen years old for this purpose. But even though the inserts should dederiorate or be lost or removed, the metal jaws would still function as satisfactorily as the old type chairs.

The novel chair has another advantage in that in case the clamping bolt becomes very loose, the inserts will prevent or reduce rattling.

Live rubber inserts are preferable due to the high coefiicient of friction between rubber and metal, but other substances might be used, such as various rubber compositions, which also have higher coefficients of friction with the metal of the beam tension rod than the metal jaws of the chair clamp. The inserts as shown may be formed of molded or strip material. The invention may also be applied to chairs for application to beam parts of non-cylindrical shape for resisting longitudinal slippage of the chair.

The invention is not limited to the details of the various forms illustrated and described and the exclusive use of all modifications that come within the scope of the appended claims is contemplated.

I claim:

1. A brake beam support chair including interconnecting parts for clamping a brake beam member between them, each of said parts having a recess, and a yielding element in each recess for engaging the beam'member to assist in maintaining the chair and beam properly assembled.

2. Incombination, ;a brake beam member, support chair jaws clamped to said beam member, and frictional inserts compressed between said member and each of said jaws for maintaining the same properly assembled.

3. In combination, a brake beam including a cylindrical portion, a support chair having jaw portions for clamping around said beam portion, and readily compressible inserts substantially lining said jaw portions for engaging said beam portion to assist in maintaining said chair and beam properly assembled, said cooperating portions of the chair and beam permitting manual angular adjustment of said chair.

4. A brake beam support chair including parts for enclosing a brake beam, said part having a rubber insert for substantially lining said parts for engaging the beam to assist in maintaining the chair properly positioned.

5. A fourth point brake beam support chair including a part for gripping the tension member of a brake beam, said part including a rubber insert for substantially surrounding the tension member to increase the frictional resistance between the same and the chair.

6. A brake beam support chair including a part for attachment to a brake beam cylindrical member, said chair part having a recess in its inner surface, and a rubber-like insert in said recess for assisting in resisting slippage between the beam and chair, said insert being of resilient material and having an integral portion interengaged with said chair part so as to maintain itself therein at all times.

7. A brake beam support chair having a part for clamping to a brake beam member, said part having recesses on opposite faces, and a rubber insert applied to one of said recesses for engaging the beam to assist in resisting slippage of the chair, said insert including a retaining portion projecting through said part into the other of said recesses.

8. A brake beam support chair having a part for clamping to a brake beam member, said part having a restricted aperture, and a rubber insert applied to said part for engaging the beam to assist in resisting slippage of the chair, said insert having an enlarged part which is compressed for insertion through said recess and then expands so as to secure said insert in position.

9. A brake beam support chair including a part for attachment to the beam, said part having a recess, and a rubber insert applied to said part for engaging the beam to resist slippage of the chair, said insert having a lateral projection with an enlargement at its extremity adapted to be distorted in insertion through said recess and to overlap said recess in the assembled position to maintain said part and insert properly assembled.

10. A brake beam support chair having a part including jaws for clamping to a brake beam member, an element pivotally connecting said jaws, and a frictional insert applied to said part for engaging the beam to assist in resisting slippage of said chair, said insert being secured to said pivot element.

11. A brake beam support chair having a part for clamping to a brake beam member, said part having a recess, and a rubber insert secured in said recess for engaging the beam to assist in resisting slippage of the chair, there being space in said recesspermitting spreadin of said insert under pressure.

12. A brake beam third point support chair including means for attachment to structure at the front of the beam, said means including a frictionalinsert element for engaging the beam to assist in maintaining the chair properly positioned.

13. In combination, a brake beam including a strut with third point support ears, a pin between said ears, and-a third point support. chair clamped to said pin, there being a rubber element between said pin and said chair for resisting slippage therebetween.

14. A brake beam support chair having opposed resilient friction elements for gripping opposite sides of a beam part, each of said elements having suction cups on its beam engaging surface. a

15. A, compressible friction pad for a railway brake beam support chair clamp comprising a clamp-lining portion for engaging a beam member, a projection on the rear of said portion for extending through the clamp, and a buttonlike head on the end of said projection for retainingthe pad in, the clamp.

- 16. A compressible friction pad for a railway brake beam support chair clamp; comprising an elongated clamp-lining portion for engaging a beam member, and relatively restricted means for retaining the pad in the clamp.

EDWIN G. BUSSE.

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