US1980016A - Brake dressing and process therefor - Google Patents

Description

Patented Nov. 6, 1934 BRAKE DRESSING AND PRQCESS THEREFOR Walter R. Thurston, Los Angeles, Calif.

No Drawing. Application April 9, 1930,

Serial No. 443,007

8 Claims;

My invention relates to dressings for brake linings and the process for producing the same, as well as its application to said linings, said invention being more particularly adapted for I the. linings of brakes used in oil well practice, but in its broader aspects being equally useful and efficacious for brakes of all kinds, in all industries, such as those used in hoisting equipments, in mining, motor vehicle brakes; in short,

10 wherever a brake of any sort or character is used.

It accordingly is an object of my invention to provide a novel form of dressing for brake linings, which may be applied thereto in any suitable way, and may be so done in numerous ways,

said dressing comprising an'intimate mixture in varying quantities and proportions, of a set of preferably powdered metals, soft in character, such as a metal of the lead group, as lead, one from the magnesium group, such as zinc, one

from the tin group, such as tin, and a soft mineral, also preferably powdered, such as a hydrous silicate of magnesium, found in nature, as for example, talc, the quantities and proportions used in practice being capable of variation, but

18 the lead being preferably the predominating ingredient of the mixture.

A further object of my invention is to provide a novel form of binder for holding the various ingredients of my novel form of composition together, which preferably consists of a suitable lubricating oil, preferably having a heavy base, intimately mixed with a material which is adapted to increase the viscosity of said oil, such, for example, as wool grease, to which are added at .35 least one or more anti-slipping materials, such as rubber, or rosin, or both, either or both of which may be in solution, preferably held so in saturated condition by a suitable solvent, such, for example as benzol.

A still further object of my invention is to provide a novel form of process of producing my novel form of composition, together with its binder, and the novel manner in which said composition may be applied to the brake linings.

45, The above and further objects and advantages of my invention, as will hereinafter more fully appear, I attain by the composition and process described in its preferred formin the specification forming a part of my application.

'501 In its broader aspects, my invention comprises the production of a brake dressing consisting of a set of soft metals, having anti-friction qualities, mixed in suitable proportions and quantities, which may in practice be varied, with a soft min- 552 eral, such as a hydrous silicate of magnesium, as

for example, talc, all being preferably in powdered form and held together by a suitable binder, which may comprise in varying quantities and proportions, an intimate mixture of a lubricating oil having a heavy base, a material to increase the viscosity of said oil, such as Wool grease, and one or more anti-slipping materials, such as rubber, rosin, and the like, preferably held in saturated solution by a suitable solvent, such as benzol.

More specifically, I first prepare the binder, which may comprise a lubricating oil having a heavy base, and to this I add in suitable .quan-, tity an ingredient for increasing the viscosity of said oil, such as wool grease, the proportions of which may be two to one, that is to say, the quantity of oil may be four or more pounds, while the wool grease may be two pounds, although I do not desire to be limited to said proportions. Rubber of a suitable variety is now dissolved in a solvent such as benzol. I have found in practice that one-half a pound of such rubber, forming a saturated solution is very emcacious, and a like quantity of rosin, also in saturated solution, are added to the mixture. It will of course be un derstood that other anti-slipping materials may be substituted for these, and still remain within the province of my invention.

Said binder is now thoroughly stirred, so that an intimate mixture will be formed, any means in practice found desirable for said stirring being used, after which the quantities of powdered lead, zinc, tin and talc are added, and intimately mixed with said binder, which results in a heavy paste having such a consistency that, if desired, said paste may be spread upon the inner surface of the brake linings with a suitable implement, such as a flat knife.

But my invention may be applied to said linings in other ways, such, for example, as impregnating said linings with said paste in any preferred way, so that an even coating of the dressing may be formed upon the inner surface of said linings.

By reason of the character of the dressing, it will in no way become attached to the brake drums with which said linings are associated, no hard lumps being formed, which will have a tendency to injure the surface of the lining, thus increasing its life, and at the same time prevent said drums from scoring.

If desired, also, said dressing or composition may be applied by means of grease cups, tapped into said linings, or said composition may be forced into said linings by pressure and be impregnated therein, in any way in practice preferred. This provides a plastic metallic, and withal an anti-slipping surface on the inner face of the brake linings, preventing slipping and creeping of the brake drum, forming a greater and more eflicacious and efficient braking area than heretofore possible, affording a maximum braking efiect with a minimum effort upon the part of the operator.

It will also be apparent that all noise in making brake application is reduced to a minimum, avoiding squealing and chattering of the brakes, and at the same time eliminating smoking usually attendant when ordinary linings or even dressed linings are used; in any event, reducing said smoking to a minimum, by reason of the metallic surface created, and at the same time its anti-slipping quality hereinbefore described.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention together with the process and composition which I now consider to represent the best embodiment thereof; but I desire to have it understood that said process and composition described is only illustrative, and that the invention can be carried out by other means.

I claim:

1. A brake dressing comprising an intimate mixture of zinc, lead, tin in varying quantities, talc, and a binder composed of .a lubricating oil, wool grease, a solution of rubber and a solution of rosin, also in varying quantities.

2. A binder for a brake dressing comprising a lubricating oil having a heavy base, wool grease, a saturated rubber solution, and a saturated rosin solution.

3. A binder for a brake dressing comprising a mixture of a lubricating oil, wool grease, rubber and rosin.

4. The process of forming a binder for a brake dressing which consists in intimately associating in varying proportions a lubricating oil having a heavy base with a saturated rubber solution of benzol, wool grease and a saturated rosin solution of benzol.

5. The process of forming a brake dressing which consists in mixing a lubricating oil with Wool grease in the proportions of two to one, adding to said mixture rubber dissolved in benzol, thoroughly stirring said mixtures, and adding thereto powdered lead, zinc and talc.

6. The process of preparing a brake dressing which consists in mixing at least one powdered metal of a set of such metals having lubricating qualities, said metals comprising zinc, tin and lead, with a binder prepared by mixing a heavy lubricating oil with a greasy material for increasing its viscosity and a saturated rubber benzol solution.

7. The process of forming a dressing for a brake lining which consists in first forming a binder of a lubricating oil having a heavy base, adding to said lubricating oil a greasy ingredient to increase its viscosity, next adding a saturated solution of rubber in benzol, next adding a saturated solution of rosin in benzol, stirring said binder to form an intimate mixture, then adding to said binder powdered lead, zinc, tin and talc, and intimately mixing the latter with said binder to form a substantially heavy paste.

8. The process of forming a binder for a brake dressing which consists in adding a greasy material to a lubricating oil having a heavy base to increase the viscosity of said oil, then, adding a saturated solution of rubber and benzol, then adding a saturated solution of rosin, and then stirring to form an intimate mixture of said materials.

WALTER R. THURSTON.