US808379A - Brake-shoe. - Google Patents

Description

PATENTED DEC. 26, 1905.

J. G. JOHNSTON. BRAKE SHOE.

APPLICATION FILED AUG. 28, 1905,

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JOSEPH G. JOHNSTON, OF DETROIT, MICHIGAN, ASSIGNOR TO AMERICAN OAR & FOUNDRY COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF NEW JERSEY.

BRAKE-SHOE.

Specification of Letters Patent.

Fatented Dec. 26, 1905.

Application filed August 28, 1905. Serial No. 276,080.

To all whom it may concern.-

Be it known that I, JOSEPH Gr. JOHNSTON, a citizen of the United States, residing at Detroit, Michigan, have invented a certain new and useful Improvement in Brake- Shoes, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a face view of a brake-shoe constructed in accordance with my invention. Fig. 2 is a side elevational View of the same. Fig. 3 is a cross-sectional view on the line 3 3 of Fig. 2, and Fig. 4: is a perspective view of one of the inserts.

This invention relates to brake-shoes; and one of the objects is to provide a brake-shoe which will be adapted to resist the strains to which the shoe will be subjected and to increase the durability of the shoe in general.

Other objects and advantages, as well as the novel details of construction, of this invention will be specifically described hereinafter, it being understood that changes in form, proportion, and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages thereof.

The form of preferred construction of insert is illustrated in detail in Fig. 4:, and it is shown as comprising an arcuate bar 1, having a plurality of cut-out portions 2, the ends being constricted, as at 3 and A. The central portion of the bar is cut out on its back edge, as at 5, the cut-out portions 2 being on the wearing-face. In actual practice these bars, which are preferably constructed of wroughtiron or soft steel, will be placed in the mold, and the metal will be poured around them. so that the finished product will be a brake-shoe similar to the one illustrated in Figs. 1 to 3. These bars will be so arranged in the brakeshoe as to provide strengthening-inserts, as well as hardened bearing-surfaces, alternating with the bearing-surfaces of the cast metal of which the brake-shoe body is composed. I prefer to arrange the bars in parallel and in duplicate; but any number may be utilized as occasion may demand. The wearing-surfaces of the bars are so spaced with relation to the surrounding material that they will be firmly interlocked with the metal of which the brakeshoe body 6 consists, so as'to prevent their be ing disturbed under any condition.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

A brake-shoe comprising a body cast complete in one piece, and a plurality of reinforcement-bars spaced apart within said body and extending longitudinally thereof, the edges of said bars being provided with transverse cut-out portions that are filled in by the metal of the body; substantially asdescribed.

In testimony whereof I hereunto affix my signature,in the presence of two witnesses, this 22d day of August, 1905.

JOSEPH G. JOHNSTON.

Witnesses:

JAMES B. HICKEY, WV. H. KIMoHE.

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