US796931A - Car-brake. - Google Patents

Description

7 No." 796,93I. PATENTEID AUG. .8, 1905 w. QUINN,

GAR. BRAKE.

APPLIGATION FILED JAN. 19. 1905.

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71 Qua Eng/($17 No. 796,931- PATENTED AUG. 8, 1905.

W. QUINN.

GAR BRAKE.

APPLICATION FILED JAN. 19, 1905.

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UNITED STATES PATENT OFFICE.

CAR-BRAKE.

Specification of Letters Patent.

Patented Aug. 8, 1905.

Application filed January 19, 1905. Serial No. 241,7 81.

To (LZZ whom, [It may concern:

Be it known that I, WILLIAM QUINN, a citizen of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented a certain new and useful Improvement in Car-Brakes, of which the following is a specification.

My invention relates to a new and useful improvement in brakes for cars, and has for its object to provide both a wheel-brake and track-brake adapted to be operated independent of one another from the same crank located upon the platforms.

With these ends in view this invention consists in the details of construction and corn bination of elements hereinafter set forth and then specifically designated by the claims.

In order that those skilled in the art to which this invention appertains may understand how to make and use the same, the construction and operation will now be described in detail,

referring to theaccompanying drawings,-

forminga part of this specification, in Which Figure 1 represents a side elevation of a portion of a car equipped with my improved brake; Fig. 2, a bottom plan view of a car without the trucks or wheels, showing my brake applied thereto, portions of the car being broken away; Fig. 3, a side elevation of the track-brake with the outside plates removed, showing the same in the position it would assume when the wheel-brakes are set; Fig. 4, a similar view to Fig. 3, but showing the parts in the position they would assume when the track-brake was set and the wheelbrakes released; Fig. 5, a vertical section through Fig. 4.

The purpose of my invention is to equip a car with both wheel-brakes and track-brakes, both to be operated from the same source of power-as, for instance, a crank located upon the platform-so that in ordinary instances by turning the crank a certain distance around, the same as is done at the present time, the wheel-brakes will be set and by releasing the crank and turning it in the opposite direction the wheel-brakes will be released; but after the wheel-brakes are set and it is found that they do not arrest the motion of the car sufficiently to avoid an accident or to stop at a desired point then by turning the crank a farther distance or double the distance it requires to set the wheel-brakes the track-brake will be set and the wheel-brakes released. To accomplish this, I provide the followingconstruction, in which A represents a casing adapted to be secured to the under side of the car upon each side thereof, and this casing has formed therein a guideway for guiding the shank B of the friction-shoe B.

G is a shaft extending across the car and journaled in suitable bearings depending therefrom. This shaft C extends laterally through both casings A and through an oblong openingB formed th rough each shank B.

D represents cams secured to the shaft 0 and located within the oblong openings B of the shanks B, and these cams D and openings B are so shaped that it will require a half-revolution of the shaft C to either raise the friction-shoe B to its highest position, as shown in Fig. 1, or force it downward in its lowest position in contact with the track, as shown in Fig. 4.

E is a gear-Wheel secured to the shaft C.

F is a bar extending the full length of the car and adapted to reciprocate in suitable guideways secured to the car. This bar F is provided upon its under side with rack-teeth F for a suitable distance engaging the teeth of the gear E, and upon each end of the bar F are provided rack-teeth F engaging spur- Wheels Gr, located upon the lower end of the crank-shaft H, which crank-shafts are located upon the platforms of the car and are the same as are now ordinarily used in applying the hand-brakes. Thus it Will be seen that when either crank-shaft H is turned the bar F will be reciprocated and the wheel E and shaft O revolved.

1 represents two oval-shaped cams secured to the shaft C and adapted to operate within the housings J, and each of said housings is connected by the links K with the wheelbrakes, so that when said links K are pulled upon the brakes will be set. These oval-shaped cams I are of such a shape relative to the housings J that a quarter-revolution of the shaft C will set the wheel-brakes, but a half-revolution will release the same. So it will be seen that in order to set the wheel-brakes it is only necessary for the motorman to revolve the crank-shaft a suflicient distance to give the shaft C one quarter-revolution, thus setting the Wheel-brakes; but should it be desired to set the track-brakes then by revolving the crank-shaft a farther distance, so as to give the shaft C a half-revolution, the trackbrake will be set and the wheel-brakes released, and in relieving the track-brake the wheel-brake will be set again while the crank shaft is being revolved backward to its normal position.

It will be seen in this device that all the operations are positive, and I do not depend upon any spring for the lowering or raising of the shoe or for setting or releasing the wheelbrakes.

It is obvious that a large number of means could be employed for revolving the shaft from the platform-such as chain connection, gearing, or any other suitable manneror, instead of one continuous rack-bar, two rackbars could be ,used extending to the different platforms, and I do not wish to be limited to the exact construction here shown, as slight modifications could be made without departing from the spirit of my invention.

Having thus fully described my invention, what I claim as new and useful is 1. In a car-brake of the character described, a casing secured in the middle of the car upon each side and depending therefrom, frictionshoes, shanks extending upward from said friction-shoes and adapted to slide vertically in the casing, a shaft extending across the car, canis secured to said shaft and located in alinement with the shanks of the friction-shoes adapted to raise and lower the friction-shoes as the shaft is revolved, cams located upon the shaft, housings inclosing said cams and against which the cams operate, links connecting said housings with the wheel-brake apparatus of the car, and means for rotating the shaft from either platform, as and for the purpose specified.

2. In acar-brake of the character described,

' a casing depending from the car upon each side, a shaft extending transversely across the car and journaled thereto, friction-shoes provided with shanks extending upward therefrom, guideways formed in the casing for guiding said shanks in their vertical movement, lateral openings formed through the shanks through which the shaft extends, cams secured to the shaft and located within the l lateral openings of the shanks so that the friction-shoes will be raised and lowered as the shaft is revolved, a second set of cams secured to the shaft, housings inclosing said cams and against which the cams operate, links connecting the housings with the wheel brake apparatus so that the wheel-brake will be set when the shaft is revolved, and means for revolving said shaft from the platform of the car, as and for the purpose specified.

3. In acar-brake of the character described, a casing depending from the middle of the car upon each side, a shaft extending transversely across the car through the casings, frictionshoes provided with shanks extending upward therefrom, the casings provided with guideways for guiding said shanks in their vertical movement, transverse openings formed through the shanks through which the shaft extends, cams secured to the shaft and located within said transverse openings, said cams and openings so shaped as to cause the friction-shoes to be raised or lowered when the shaft is revolved through a certain partial revolution, cams located upon the shaft, housings surrounding said cam and against which the same operate, links connecting said hous ings with the wheel-brake apparatus, said housings and cams so shaped relative to one another that the wheel-brake apparatus will be set when the shaft has been turned only half the necessary distance to set the trackbrakes, and when the track-brakes are set the wheel-brake cams will be so turned as to release the wheel-brakes, and means for revolving the shaft from either platform of the car, as specified.

In testimony whereofI have hereunto aflixed my signature in the presence of two subscribing witnesses.

WVILLIAM QUINN.

WVitnesses:

JOSEPH C. MURPHEY, M. E. SMEDLEY.

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