US393587A

US393587A - Brake for railway-cars

Info

Publication number: US393587A
Authority: US
Publication date: 1888-11-27
Anticipated expiration: 1905-11-27

Description

- (No Model.) J. E. ROBINSON.

BRAKE FOR RAILWAY CARS.

No. 393,587. Patented Nov. 27, 1888.

J e: 15: 1 1: e

N PETERS. Pmlu-Lnmgn hur. Washington, D. C.

NiED STATES PATENT OFFICE.

JOHN E. ROBINSON, OF PHILADELPHIA, PENNSYLVANIA.

BRAKE FOR RAILWAY-CARS.

SPECIFICATION forming part of Letters Patent No. 393,587, dated November 27, J 888.

(No model.)

.To aZZ whom it may concern.-

Be it known that I, Jenn E.RO13INSON, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Brakes for Railway and other Cars, of which the following is a specification, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The object of my invention is to provide a brake that will require but little power to op erate it, and in which the frictional contact with the wheel will be distributed over a large I amount of space, thereby red ucing the wear on both wheel and brake.

The invention consists in the several details of construction and arrangement hereinafter fully described.

In the drawings, Figure l is a side elevation of a car-truck with my improved brake mechanism applied, and Fig. 2 is a plan.

Similar letters of reference indicate similar parts in each figure.

A A represent the wheels on one side of a truck, and B B are brake-shoes.

C O are metal straps, preferably steel, the lower ends of which are on a line with the lower ends of the brake shoes, but on the opposite sides of the wheels.

D D are links connecting the lower ends of the straps G O to the brake-shoes B B. The links inelose the wheels, the latter revolving within them. The straps extend about onehalf way around the peripheries of the wheels, and are suspended in close proximity to their faces or treads by means of the spring E, the link connections 6 between the spring and straps being adjustable, as shown.

F F are crank'shafts, which extend across the car-truck and are provided at their respect ive ends with crank-armsff, the arms being each rigidly connected at a point about midway of its length to one of the shafts. One end of the crank-arm f is pivotally connected to the brake-shoe B and the other end similarly connected to a link, G. This link in turn is adjustably connected to one end of a rod, G, the other end of which is pivotally connected to the upper end of the strap 0. One end of the crank-arm f is pivotally connected to the brakeshoe B, the other end being similarly connected with one end of a rod, H, which passes through the link G and is connected at its other end to the upper extremity of the strap 0.

I I are levers rigidly connected attheir lower ends to the crank-shafts F E" about midway of their length.

K is a chain, one end of which is attached to the upper end of the lever I. The chain K passes around a pulley, t, on the upper end of the lever I to a drum, J, on the brake-spindle J.

The levers I I are bent, as shown, in order to clear the cross-timber of the truck when the upper ends of the levers are drawn together.

I have described the brake mechanism on one side of the truck only; but it is to be understood that it is applied to the wheels on both sides alike, the chain K, levers I I, and the crank-shafts F F being the operating devices common to both sides. The brake-shoes, straps, and operating-levers and crank-shafts are supported by the spring E alone and entirely free from any connection with the truck, except through the medium of the spring E and chain K.

The operation is as follows: lVhen the brakes are off and the wheels revolving in the direction of the arrow, the brake mechanism will be in the position shown in full lines in Fig. l, the straps and brake-shoes being clear of the periphery of the wheel. In order to apply the brakes, the chain K must be wound on the drum J, whereupon the lover I will be drawn over toward the lever I, and thus turn the crank-armf out of a straight line with the link G and rod G, as shown in dotted lines, Fig. 1. This will cause friction to be applied to the upper part of the front wheel by means of the strap 0 and to the lower part of the rear wheel by means of the brake shoe B, the crankarm f and the rod H maintaining a straight and rigid position. If the wheels were revolving in the opposite direction, the crankarmf would be turned out of a straight line with the rod H, and friction would be applied to the lower part of wheel A by means of the brakeshoe B and to the upper part of wheel A by means of the strap 0. If the wheels are revolving, the lever which operates the crankarm connecting the slack ends of the brakes will travel over to the other lever when the chain K is wound on the drum, the latter lever remaining stationary. If, however, the chain is wound on the drum when the wheels are at rest, each lever will move toward the other an equal distance. i

If desired, the straps and brake shoes may be made to operate on the rim of the wheels instead of the tread, and so save wear on the latter.

NVhen the brakes are applied, as the wheels pull on each other equally, there will be no jar or vibration given to the car, as is the case when the brakes are attached to the truckframe. 7 V e The wear on the straps and shoes can be taken up by the adjustable connection between the link G and rod G and link H and rod H.

Having described my invention, I claim- 1. The combination, with the front and rear wheels of a truck, of the metal straps and brake-shoes, links connecting the lower ends of the brake-shoes and straps on each wheel, crank-arms and links connecting the upper part of the brakeshoe on one wheel with the upper end of the strap on the other wheel, a spring attached to the truck and supporting the straps, and levers for operating the crankarms, substantially as specified.

2. The combination. with the front and rear wheels of a truck, of the metal straps and brake shoes, links inclosing the wheels and con- 3. The combination, with the wheels of a truck, of metal straps and shoes suspended in close proximity to the peripheries of the wheels and connected as specified, crank-shafts extending across the truck, crank-arms on the ends of said shafts, one end of said arms be ing attached to the upper end of a brake-shoe on one wheel and the other end to a suitable connection leading to the,,upper endeof the strap on another wheel, levers rigidly attached to the crank-shafts, and means for operating said levers, substantially as described.

4. The combination with the front and rear wheels of a truck, of straps partly encircling the said wheels, brakeshoes, links connecting the straps and brake-shoes, means for supporting said straps in close proximity to the wheels, and devices,substantially as described, for applying the straps and brakeshoes to the wheels, for the purpose set forth. n

In testimony whereof Ihave hereunto set my hand and seal.

JOHN E. ROBINSON. [L. s]

Witnesses:

E. Cause, 0. B. THOMPSON.