US1539444A - Brake lining - Google Patents

Description

May 26, 1925. w 1,539,444

E. J. TRAINOR v B'RAKE LINING Filed Sept. 9. 1921 1 ll l 1 1| I wi M 1 a MNVENTOR Patented May 26, 1925.

UNITED STATES EDWARD Human, or BROOKLYN, NEW YORK, nssrenon TO AsBEs'ro s' spinn ng A-ND WEAVING conronarron, or NEW YORK, n. Y., a CORPORATION or' nnw YORK,

Application filed September 9, 1921. Serial No. 499,557.

To all whom it may concern:

Be it known that I, EDWARD J. TRAINon, a citizen of the United States, and a resident of Brooklyn, county of Kin s, State of New York, have invented an l mprovement 1n Brake Linings, of which the following is a specification.

My invention relates to a lining-for friction brakes and is particularly applicable to the brake linings used in motor vehicles which operate under extremely adverse conditions of friction, heat andexposure.

My improved brake lining in its preferred form embodies a woven fabric comprising strands of wire interwoven with strands of heat resisting fibrous material such as asbestos which may-be impregnated if desired with a suitable substance such as rubber compound, bitumen, etc.

My invention further embodies a brake lining formed of strands of wire interwoven with strands, or ropes of asbestosfiber in such a manner that the ropes of asbe tos-are .compressively held in a hard twisted state, whereby the tensile strength of said ropes is materially increased permitting the elimination of a filler such as cotton fiber or the like.

In the drawings I have shown in Figure 1 a front view of a piece of my improved brake lining,

Figure 2 a sectional view thereof and in Figure 3 a perspective and sectional view showing the method of building up a brake lining from a piece of my improved brake lining fabric.

It will be understood that the fabric comprises a warp of wires 1 which are chosen with reference to the conditions of use of the brake lining and are preferably of a relatively high tensile strength and of a charac I ter to resist abrasion. These wires are so :related to the weft strands 2 of thefabric as to compress and hold the fibers of each weft strand in intimate contact with one another f by clam ing the weft strands between adjacent warp wires, it being understood that the weft strands are formed of twisted strands of heat resisting fibrous material such as asbestos and that the fibers of such strands are frequently relatively short. It is the practice in the manufacture of asbestos strands to incorporate in the strandsa certain amount of cotton fiber to enable the strands to be spun, but obviously in the use BRAKE LINING.

. of asbestos .for brake liningslit great extent, if not altogether, with, the cotton .fiber. This method of constructionalso adds greatly to the strengthof. the fabric and to its wear as it prevents the fraying of the asbestos fibers upon the surface of the fabric.

In making the fabric into a brake lining I prefer'to fold the fabric along the line of the warp wires asshown in Figure 3, covering the folded strip with rubber or other sultable composition and vulcanizing or otherwise attaching to the back thereof a canvas or similar strip 3.

it, will be noted that in cutting and foldingthe fabric into a brake lining accurate cutting dies are unnecessary since the fabric may be out, along the line of the warp wires and when so cut will not fray at the edge.

Similarly, in folding the fabric as indicated above the fold is made along one of the warp wires and consequently is certain to be straight and to thereby preventthe possibilit of any bias pull being exerted upon t e fabric when cut. My improved brake lining presents many advantages over the brake linings used at the present time in addition to those referred' to above. For instance, dueto the closeness of the'weave and to the great uniformity in thickness resulting from the construction described above, the brake lining exerts an portance. since it permitsdispensing -to effective friction over a greater area and is more certainly and easily attached bymeans.

of rivets, there being no danger of the rivets pulling through the lining as they are certain to engage a substantial number of wire'warp threads.

My improved brake lining also has a longer life due to the large percentage of wire in the fabric and the high compression of the asbestos and the large bearing surface presented. It presents agreat resistance to the pull of the Brake drum upon the lining since the pull of the brake drum is in the direction of the warp, that is, the

direction of the metallic wires. The asbestos or other heat resisting material be- 1 What Ifclaim is:

ing held by the warp wires cannot The liningis stifi and consequently easily handled J scribed above cannot fray at the edges.

It will be evident that many modifications:

may ".be made' without departing from the spiritof my invention and I do n'otwish to confine myself to the precise details shown anddescmbed i Y 1 1. A brake lining including interwoven strands v a heat resisting fibrous material.

52. A brake -.linin'g including intei wovenp strands of-bare wire and asbestos, :said strandslzofwire compressively clamping the strandspf asbestos.

3. A ibrake lining including interworen,

-. rands-of bare wire. and: strands of a fibrous heat resisting material, the wire being so related to the strands of heat resisting material as to'holflithe fibers. thereof in compressive clampingcontactwith one another,

-whereby Fhard hi 'QP the fl s material'are .fiormed.

folded upon itself .a'lo

'straiids of bare and applied, and if made as d e fibrous material folded'upon itselialongitlie wires, a; weft ofofwire and hard twistedstrands of alo mm of wire ma wines."

hmng interwoven wire ,and heat res line of the wires, coated withi'ajresiiient com- 6." A brake lini comprising a warp to! related to 'the --a'sbestos weft to hold the fibers thereof in close contact, folded along the line of the warp wires, 7 impregnated having atwith afrhbber composition and tachedthereto a backing of canvas. I 7; A brake lining comprising a, warp of ires, a weft of twisted strands of asbestos,

t e warp wires being so related to theiweft of asbestos strands as to compressively hold the latter in a hard twisted condition, folded misting stem the 0t ith I the wires being the line of the warp wires, impregi he with a flexible'chemical binder, and having attached: thereto a backingof cans} vas. I; In testimony whereof, I- have signed my;

name to this specification thie -18th. day. of p h August, 1921. brake liningfz coinprising' interwoven 1 g EDWARIiJ TBAINOR.

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