US734556A - Shoe-brake. - Google Patents

Description

No. 734,556. g PATENTED JULY 28, 1903..

0. W. HOGH.

SHOE BRAKE.

APPLIOATION FILED APR. 22, 1903.

N0 MODEL.

, F d1 7 Hwy 7' Z. w Y W UNITED ST TES PatentedJuly 28, 1903.

PATENT OFFICE.

SHOE-BRAKE.

SPECIFICATION forming part of Letters Iatent No. 734,556, dated July 28, 1903.

Application filed April 22, 1903.

serial No. 153,802; (No model.)

To all whom it mag concern;

Be it known that 1, CHARLES W. HooH, a citizen of' the United States, residing at Brooklyn, in the county of Kings, in the city I that class of inventions to which car-brakes operated either by hand or by transmitted power are allied, but does not specifically include the latter.

My device was not invented as a substitute for the hand-power brakes in present use, but as an auxiliary thereto, as an emergencybrake, tobe resorted to only on occasions of imminent peril to avoid collisions or to save life on cars of the class heretofore mentioned which have proven so inadequate in emergencies.

I am awarethat shoe-brakes were in use and are still used in various forms for retarding the speed of vehicles prior to the invention of my device; but I claim that brakeshoes provided with turndown flanges corresponding to the flanges of the wheels forged to conform to the plane periphery of the front wheels attached to a rail-car, superimposed between the revolving wheels and rails by means of a lever for the purpose of checking the revolution of the wheels and derailing the car by lifting the forward truck-wheels from the rails, is a new result.

It is a matter of observation that when one moving body impinges directly on'another the velocity of the first is diminished by the impact. It will have lost momentum. The single or momentary force with which a body is impelled by another body striking it is termed the impulse. The strictly mathematical definition of an impulse is the limit of a force which is infinitely great, but acts only during an infinitely short time.

In my invention I have demonstrated that the impulse of the impact may be overcome by means of leverage sufficiently powerful to hold the brake-shoes in position during the infinitely short time hereinbefore mentioned.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate correspondingparts in both'views.

Figure 1 is a side View showing my device attached to a car; and Fig.2, a plan View of the same, showing the faces'of the brake-shoes and two arms or rods.

I accomplish this object byemploying a metal brake -lever A, Fig. 1, rocking on a transverse fixed axle B, mortised in the platform of a car, the lower end of said brakelever being bifurcated to receive perforated bent r'ods D D, which are movably coupled to it by a threaded bolt and nut C. The rods D D are supportedand guided by adjustable metal U-shaped hangers E E, bolted to the flooring of the car, the ends of'which are threaded to receive nuts. The lateral ends of the rods D D are forged or cast to conform to the plane periphery of the wheels b b and have inside turndown flanges a a of the same depth as the wheel-flanges.

The modus operandi is as follows: When the brake-lever A is thrown over to check speed, (from d to c, Fig. 1,) the bent rods D D and terminating brake-shoes Z) Z) are thrust backward, said brake-shoes drop to the rail, being guided thereto by the adjustable hangers E E and come in contact with the wheels,

the friction caused thereby checks the revolution of the wheels, and the flanges a a of the brake-shoes b b, underlying the wheelflanges, chock them. The sudden arrest of impetus causes the truck to rise, and being no longer guided by the flanges it is derailed.

Having thus described my invention, I claim as new and desire to secure by Letters Patenta A car-brake consisting of a brake-lever, A, rocking on a transverse fixed axle, B, said brake-lever being movably coupled to bent rods, D, D, said rods being provided with ter minal flanged brake-shoes, b, b, and supported by adjustable hangers, E, E, combined,

arranged and operated substantially asshown and described.

CHARLES W. HOCH.

' Witnesses: V k

ALEXANDER HENKEN, JOHN H. BRENNEN.

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