US299526A - Assigedbto dudley - Google Patents

Description

(No Model.)

T. W. DUFFY.

GAR BRAKE.

Patented June A3, -188 -IEN illlllll UNITED STATES PATENT UEEICE.

THOMAS WM. DUFFY, OFMEDFORD, MASSACHUSETTS, ASSIGNOR TO DUDLEY C. HALL, OF SAME PLACE.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 299,526, dated .Tune 3, 1884-.

Application filed March 19, 1884. (No model.)

.To LZZ zchom it may concern:

Be it known that I, THoMAs WM. DUEEr,of Medford, in the county of Middlesex, State of Massachusetts, have invented a certain newl and useful Improvement in Car-Brakes, ofwhich the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same,

Io reference beinghad to the accompanying drawings, forming a part of this specication, in which- Figure lis a sectional top plan view, and Fig. 2 a side elevation showing my improved brake attached to the truck of a car.

Likeletters of reference indicate corresponding parts in the different figures of the drawings.

My invention relates to that class of carbrakes known as air or vacuum brakes; and it consists in a novel construction and arrangement of the parts, as hereinafter more fully set forth and claimed,by which a simpler, cheaper, and more effective device of this character is produced than is now in ordinary use.

The nature and operation of the improvement will be readily understood by all conversant with such matters from the following explanation, its extreme simplicity rendering an elaborate description unnecessary.

In the drawings, A represents the frame of the truck, B B the wheels, C C the boxes, D the yoke, and E E the springs. These parts being all ofthe ordinary construction and not herein claimed, when in and of themselves considered, itis deemed unnecessary to more particularly describe them.

Projecting downwardlyfrom the frame-work A, and securely attached thereto by the bolts x, there is a cylinder, G. (Represented in Fig. 2 with 'one of its sides partially removed.) Disposed within this cylinder there is apiston, m, provided with a guide-rod, l, and pistonrod I-I, the latter passing through and being fitted to work vertically in a hole in the head J. A coiled spring, K, is also disposed'lwithin the cylinder, the upper end of the spring abutting against the lower side of the piston, and its lowery end resting on the head J, the spring 5o acting expansively to force the piston upwardly within the cylinder. The lower end of the piston-rod H terminates in a cross-bar, L, or is T-shaped, as shown in Fig. 2, the bar being provided on its lower side with the detachable brake-shoe M, which is secured thereto by bolts z. A double or V-shaped brace, N. provided with the vertical slot i, is attached at either side of the cylinder to the under side of the frame-work of the truck, and projecting later- 6o ally from either side of the bar Lthereis a stud, d, the Astuds being adapted to work vertically in the slots as the piston-rod H rises and falls.

It will be understood that the truck is furnished on either side with one of the cylinders G and two of the braces N, and that the brake-shoes M are so arranged as to be directly over the rails B, on which the trucks B rest.

In the use of my improvement air is forced into the cylinder G above the piston m, caus- 7o ing the rod H to descendand press the shoe M upon the track, thereby braking or stopping the truck and superposed car (not shown) in a manner which will be readily obvious without a more explicit description. When the pressure on the air is withdrawn, or the relief-valve (not shown) is opened, the spring K will act to raise the shoe from the rail or take off the brake. The shoe is curved upwardly at either end, as seen at f, thereby 8o adapting it to brake the truck or car equally well when running in either direction.

It will be obvious that the end-thrust of the shoe, caused by its frictional contact with the rail, will be resisted by the brace Nand stud d, and that the power necessary to overcome the friction between the shoe and rail will consequently be exerted in braking or stopping the truck.

Instead offorcing air into the cylinder above 9o the piston, as described, a vacuum may be formedby withdrawing the air from beneath the piston and produce substantially the same result.

As the mechanism for forcing air into the cylinder above the piston, or withdrawing it from below the same, as the case maybe, consists of the pipes, pumps, and other well-known appliances for like purposes in common use with nearly all ordinary air or vacuum carbrakes, it is not deemed essential to shonY them in order to a full understanding,` of my iniprovenient.

I do not eonine myself tothe use of the studs d and slots i for engaging the piston-rod and braces, as other means for the saine purpose may be employed, if desired, and accomplish the same results. Neither doIconiine myself to locating the brake between the wheels of the truck, as shown, as it may be placed centrally beneath the body of the car, or in any other suitable position desired.

Having thus explained my invention, what I claim is- 1, In a car-brake substantially such as described, thefollowinginstrumentalities, to wit: an air-cylinder provided with a piston, a pistou-rod connected with said piston 1within the cylinder and earryinga brake-shoe at its outer end adapted to engage the rail, a springdisposed within the cylinder and adapted to retract the piston-rod, and abrace, substantially as described, adapted to resist the end-thrust of the brakeshoc when said shoe is in frietional contact with the rail, in combination with suitable operative mechanism, substantially as set forth.

2. In a ear-brake substantially such as dcscribed, the cylinder G, provided with the pis ton m and spring K, the rod H, provided with the bar L, shoe M, and stud d, and the braces N, provided with the slots i, constructed, conibined, and arranged to operate substantially as spcciiied.

THOMAS XVM. DUFFY.

Vi tn esses:

Homer; D. Ham., C. D. WMNWmGirr.

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