US550000A - Car-brake - Google Patents

Description

(No Modl.)

" D@ H. GRANT.

GAR BRAKE No. 550,000." Patented Nov.- 19, 1895l @vih/Lamm, EN: E t imam/tof :52:7 6W @Houma/VM NDRFW BGRAHAM,PHOTB-LTNUAWASHINGTUN. 0.5.

- be applied to UNITED STATES PATENT OFFICE.

DAI'EL GRANT, OF RAYMORE, MISSOURI.

CAR-BRAKE.

vSPECIIEIGATION forming part of Letters Patent No. 550,000, dated November 19, 1895.

Application med August 2o, 1895.

To all whom it may concern:

Be it known that I, DANIEL I-I. GRANT, a

vcitizen of the United States, residing at Ray# more, in the county of Cass and State of Missouri, havev invented certain new and useful Improvements in Car-Brakes, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to improvements in car-brakes.

The object of my invention is to provide a simple, cheap, and efficient brake adapted to the trucks of street or railroad cars.

My invention consists in a brake in which a roller is forced in front of one or more of the car-wheels, the roller being of sufficiently small relative diameter that the wheel of the car will tend to climb upon it for purposes hereinafter fully set forth.

.My invention further comprises certain novel features of construction hereinafter v fully set forth and claimed.

In the accompanying drawings, illustrative of my invention, Figure 1 represents avvertical elevation View of a car-truck to which my invention has been applied, portions of the frame and car-wheels being broken away in order to more clearly show the operating parts. Fig. 2 represents` a plan, view of a car-truck to which my brake has been applied,one of the rear wheels being shown broken away. Fig. 3 represents a vertical sectional `view taken in the direction'of thenarrow on the vertical dotted line a b of Fig. 1. In this view thechain 33, the connecting-rod 17, and theyokes 28 are removed.- Fig. el represents a perspective view of the lever-lockingplate 19. Fig. 5 represents a perspective view of theyoke 28.'

In the various views similar numerals of reference indicate similar parts.

1 indicates a rectangular truck-frame of ordinary design, which is provided with two transverse beams, designatedby 4 and 5.

2 indicates the car-wheels.

3 designates the two axles to which theccarwheels are secured,` the axles being connected to the truck-frame in the ordinary manner. v

For the purposesof explanation the right end of the truck, as' shown in the first two figures, is assumed to be the forward end of Serial No. 559,898. (No model.)

the truck, the truck moving from left to right. Located beneath the frame 1 to the front of the rear axle and to the rear of the forward axle, respectively, are the two transverse rockshafts 6 and 7. Near the center of each rockshaft 6 and 7 is secured an upwardly-extend ingarm 16. The twoarms 16 are connected together by means of a horizontal connecting-rod 17, the ends of which are preferably bifurcated and pivot-ed to the upper ends of thearms 16. Reciprocal movement is imparted to the connecting-rod 17 by means ofalever 18, the lower end of which is bifurcated and pivoted to the connecting-rod 17 near its .versehorizontal plates 20, which are secured one upon the top side of eachbeam 4 and 5. The upper edge of theplate 19 is arcuate and is provided Vwith three notches 2l, into which is adapted to engage thelower end 22 of asliding rod 23, which lies parallel to the lever on its rear side. The upper end of therod 23 is pivoted to a bell-crank 25, which is pivoted to thelever 18 near its upper end, and is adapted to be operated bythe hand when clasping the lever. Aclip 26, secured at its ends to thelever 18, embraces therod 23 and serves asa guide for the lower end of therod 23. A coil-spring 24 encircles therod 23 between the lower enlarged end of therod 23 and theclip 26. The tension of this coiled spring is such as will tend to force the lower end of therod 23 into anotch 21 when thelever 18 is in the proper position. The rock-shaft 6 is U-shaped, the vertical legs orarms 12 extending downwardly and at their extreme lower ends are bent at right angles outwardly, as indicated by 13. Upon each portion 13 is mounted aroller 8, which is revoluble upon this portion of the rock-shaft. Upon each side of theroller 8 and pivoted to the horizontal portion 13 is the end of a U-shaped link oryoke 28, the closed portion of the link being Ain sliding connection with aU-shapedbracket 30, secured to the under side of the side beams of the frame 1. Both side beams are provided with such brackets TOO upon their under sides, one forward of the rear car-wheel and one to therear of each forward car-wheel.

Theroller 8 is so shaped as to conform to the shape of the periphery of the car-wheel, a portion of the rollerbeing hollowed out at its inner end so as to iit the liange of the wheel. The inner leg of the link 2S is provided with an upwardly-extendingarm 31, which prevents the roller from beingforeed inwardly. Upon each end of the horizontal portion of the rock-shaft G is secure-d acam 14, which is mounted within a U-shapedbracket 27, secured to the under side of the side beam of the truck to the rear of thebracket 30. A similar bracket is provided in front of theforward bracket 30, in which is mounted a cam 15, secured upon each end of the horizontal portion of the rock-shaft 7 The roekshaft 7 is similar in form to the rock-shaft G, and is provided witharms 10, similar to thearms 12, the lower ends of thearms 10 being turned at right angles outward and having mounted on the said ends rollers f), similar to therollers 8. Alink 29, similar to thelink 28, has a sliding connection at one end with theforward bracket 30, the other end being pivotcd to the ends 13 of the rock shaft. Secured upon the rear axle is a sprocketwheel 3ft, which is connected by means of a sprocket-chain with a sprocket-wheel 35, secured upon the forward axle.

indicates the rail of the car-track.

My invention is operated as follows: Vvhen it is desired to apply the brake, the lever 1S is drawn backward at its upper end until the lower end of therod 22 is over the slot 2l on the left of theplate 19, at which time the spring 2i forces the lower end of therod 22 into the slot, thus locking the lever in that position. During the rearward movement of the upper end of the lever the lower end, being pivotcd to the connecting-rod 17, forces the said rod forward, thus rocking the arms 1G and causing the rock-shafts to rock in a direction that theroller 8 will be forced under the rear wheel and theroller 9 away or to the rear of the forward wheel. This position of the parts is shown in Fig. 1. By compressing the bell-crank 25 therod 22 may be withdrawn from the rear slot 2l and the lever then moved forward to a central or a forward position. NVhen placed in the central position, both rollers will be removed from under the wheels and lie above the track. When the lever is placed so that therod 22 engages theforward slot 21, the rock-shafts will be so rocked as to force theroller 9 upon the rail and under the forward car-wheel. This position is never used excepting in such cases as when the car is moving to the left. The cams letand 15 are eccentrically formed for the purpose of more easily withdrawing the rollers from under the wheels. The brackets serve to prevent the rollers from being drawn too far beneath the car-wheels when they are applied against the wheels. As soon as theroller 8 placed inthe position shown in Fi l, with the car moving to the right, the wheel begins to climb upon the roller and causes the roller to revolve in the opposite direction to the way the car is moving. The roller bearing upon the rail and revolving' in the direetion stated, and also bearing the weight of the rear car-wheel and that end of the car, tends to pull the car rearwardly or in the opposite direction to which thc car is moving, and at the same time it tends to reverse the movement of thecar-wheel, and consequently the direction of the movement of the axle and the sprocket -wheel 34. The reversing of the movement of the sprocket-wheel 2:34 causes the chain to act in a manner upon the sprocketwheel as to cause it to revolve rearwardly and, through the intermediacy of the forward axle, causes the forward wheels to revolve rearwardly, thus bringing the car quickly to a stationary position. Theouter leg 31 of thelink oryoke 2S 29 may be dispensed with, if desired, as the flange of thc wheel prevents the roller from being forced too far inward.

Various other modifications of my invention may be made without departing from its spirit.

Having thus described my invention, what I claim., and desire to secure by Letters latent, is-

1. In a car brake, the combination with a truck frame, of two axles journaled thereto, each axle being provided with two wheels adapted to run on a track, gearing connecting the two axles whereby motion from one is imparted to the other, two rock shafts pivotcd to the truck frame parallel to the axles and each rock shaft being provided with a roller at cach end adapted to be forced between the track and one of the wheels, a crank arm on each rock shaft, a rod connecting each crank arm, a lever pivotcd upon the truck frame and to the connecting rod, and means for locking the lever in a desired position, substantially as described.

2. In a car brake, the combination with a truck frame, of two axles journaled thereto, each axle being provided with two wheels adapted to run on a track, thechain wheels 34, and 35 secured one upon each axle, the chain, 33, connecting the chain wheels, the rock shafts Gand 7 each provided with a crank arm, the rod, 17, connecting the crank arms, means for reciprocating the connecting rod, a crank arm at each end of each crank shaft having revoluble thereon a roller adapted to be forced between the track and the adjacent wheel, substantially as described.

In a car brake, the combination. with the truck frame, of two axles providedwith carrying wheels adapted to run on the track rails, the axles being revoluble in bearings mounted upon the truck frame, two rock shafts mounted upon the truck frame and provided with a crank arm each, a roller chock block rev- IOO IIO

olubly mounted upon the crank arm of each of said rock shafts and adapted to be inserted one between the track rail and one of the wheels of the rear axle and the other between the track rail and one of the wheels of the forward axle, means for making such insertions or withdrawing therefrom,'and gearing connecting the two axles whereby similar direction of motion is imparted from one axle to the other, substantially as described.

In testimony whereof I afx my signature in presence of two witnesses.

DANIEL H. GRANT. Witnesses:

J. W. DooREs, T. W. BANNER.

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