US463695A

US463695A - Car-brake

Info

Publication number: US463695A
Authority: US
Publication date: 1891-11-24
Anticipated expiration: 1908-11-24

Description

(No Model.)

W. W. ALLEN.

GAR BRAKE.

PatentedNov. 24', 1891.

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WILLIAM NV. ALLEN, OF ST. PAUL, MINNESOTA.

VCAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 463,695, dated November 24, 1891.

Application filed June 22, 1891. Serial No. 397,011. (No model.)

To all whom it may concern,.-

Be it known that I, WILLIAM W. ALLEN, a citizen of the United States, residing at St.

, Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Safety-Brakes for Street and other Cars, of which the following is a specification.

This invention relates to safety-brakes for street and other cars; and it consists in the construction and arrangement of parts, as hereinafter shown and described, and specifically pointed out in the claim.

In the drawings, Figure lis a cross-sectional elevation, Fig. 2 is a side elevation, and Fig. 3 is a plan view, of a portion of a car frame and truck, showing my improved brake attached thereto. Fig. 4 is an enlarged detail of one of the brake-shoes. Fig. 5 represents the brake-actuating arm detached.

A represents a portion of the platform or frame of a car, B B2 the axles, B3 the wheels, and D D2 the rails, all these parts being of the usual construction. Journaled by hangers or brackets E E2 across beneath the carframe at one or both ends or between the trucks, as may be preferred, is a shaft E3, upon which are secured in line with the rails D D2 two cam-brake shoes E4 E5, as shown. The lower surfaces of these cam-shoes are formed curved on one yend at a and straight for the remainder of their length, as at a2, the distance from the center of the shaft E3 to the flat surface a3 being greater than the distance between the center of the shaft and the. rails D D2 when the wheels B3 are in their normal position upon the rails, while the curve of the part ce is eccentric to the shaft, the radius of the outer end a3 being about equal to the radius of the wheels, so that when the shoes are thrown downward, the part a3 striking the track, the momentum of the car causes the shoes to roll forward,

, raising the car-body until the wheels B3 are of the momentum ofthe car to roll the shoes 5o over beneath it is counteracted.

Upon the shaft E3, at some convenient point between the shoes E4 E5, is secured a doublesided arm F F3, the part F connected by a chain b to a rod b3 and the part F2 connected 55 by a chain Z13 to a rod b4, the two chains in their passage from the arm to the rods passing over guide-sheaves b5 b3. The rods b2 b4 are supported loosely in hangers beneath the car-frame and are connected by chains b3 127 6o to a chain sheave or drum b3 on the lower end of a brake-staff G, the latterbeing of the usual construction and placed in the usual position of the ordinarybrake-staff of a car. By turning the brake-staff to the right the chain b3 65 will be wound upon the drum b3 and the chain Uf unwound therefrom, this action drawing the part F upward and throwing the shoes E4 E5 downward to bring them into action. Then when the brake-shoes are to be released 7o the reversing of the motion of the brake-staff will wind up the chain 297 and unwind the chainb3, thus drawing the arm F2 backward and releasing the shoes from the rails. The surfaces a a2 are provided with a strip of rub- 75 ber H, secured at its ends by clips CZ to the shoes, the presence of the rubber preventing a jarring motion from being imparted to the car body or trucks by serving as springs between the shoes and rails.

The inner edges of the shoes E4 E5 are provided with flanges e to rest against the inner surfaces of the rails to serve the same purpose as the Iianges on the wheels B3 to prevent the car being thrown from the track when 8 5 the brake-shoes are in action.

The curved portion a is united to the straight portion a2 without any sudden change of direction, so that no sudden jar occurs when the shoes pass from the curved to the straight 9o portions of their surfaces.

The brackets E E2 may be braced and supported in any desired manner to render their position secure and to enable them to resist the strains to which they will be subjected.

lVhile the means shown for actuating the brake-shoes is a practicable one and well adapted to the purpose, I do not wish to be pendicular line through the center of .said shaft, and means whereby said shoes may be forced downward upon the rails, substautiall y as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

lVILLIAM ALLEN.

Titnessesf Il. S. WEBSTER, C. N. WOODWARD.