US619562A - Car-brake - Google Patents

Description

l Patented Feb. I4, |899. W. W. GEORGE.

C A R B R A K E (Application filed Jan. 81, 1898.)

(No Model.)

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vIVILLIAM WV. GEORGE, OF IRWIN, PENSYLVANIA.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 619,562, dated February 14, 1899.

Application filed January 31,'1898. Serial No. 668,533. (No model.)

To all whom t may concern.-

Be it known that I, WILLIAM W. GEORGE, of Irwin, in the county of Westmoreland and State of Pennsylvania, have invented a new and useful Improvement in Oar-Brakes, of which the following is a full, clear, and exact description, reference bein g had to the accompanying drawings, forming part of lthis speciication, in which- Figure 1 is an inner side elevation, partly broken away, of my improved brake in position upon the side frame of a car-truck. Fig. 2 is a similar view of the brake in depressed position. Fig. 3 is an outer side elevation of the brake. Fig. 4 is a top plan view. Fig. 5 is a vertical longitudinal section; and Figs. 6 and 7 are cross-sections on the lines VI VI and-VII VII, respectively, of Fig. 2.

My inventionA relates to that type of carbrakes wherein the brake -shoe is pressed against the rail; and it consists in a new and improved construction of brake-operating mechanism therefor whereby the eectiveness of the braking action is increased, the liability to jamming or binding of the brake is avoided, and a simple compact and strong structure afforded.

In the drawings, 2 represents the side frame of a car-truck, and 2 one of its wheels. This side frame is of T shape and to it is secured a casting 3, which is provided with a slot entered by the web of the T. Over the top of the side frame extend the straps 4 4, which at their outer end are provided with bolts passing through flanges cast on the part 3 and at their inner ends with screw-bolts extending into the casting, as shown in Fig. 5. The general shape of this casting is shown in Fig. 3, and to its inner face is secured a hollow case 5, containing the vertically movable brake-block 6. The case is provided with a removable inner cover-plate 7 and is secured to the casting 3 by screw-bolts 3, which pass through slotted lips upon the case and enter the casting, and by a screw bolt 9, which extends through a slot in the casting and engages the case. The case may thus be vertically adjusted to compensate for the wearing away-of the brake-shoe. The upper portion of the case and its cover-plate is provided with bearings for a rock-shaft 10, to which is secured a segmental slotted cam 11.

This cam is adapted to oscillate within the case, and the inner edge of the slot is provided with teeth, which engage a toothed wheel 12, carried in a yoke at the upper end of a swinging link 13. The link 13 terminates at its lower end in a circular lug, which is carried in a similarly-shaped recess in the brake-block, it thus forming ahinge-joint between the link and the block. The brakeblock is provided on each side with pivoted rollers 14, engaging the case, and the lower part of the case is provided with rollers 15, which engage the sides of the block in its movements. These rollers take up the lateral or side strain upon the Ablock and prevent binding of the block in the case, and I preferably provide the case with a vertical rib 16, as shown in Figs. 6 and 7, which ts ina corresponding recess in the casting 3 and thus transmits the side strain to the casting. The brake-shoe 17 is pivotally connected to the lower'end of the brake-block. The shaft 10 is provided at its inner end with a grooved pulley 18, by means of which the brake may be actuated.

The operation is as follows: The parts being normally in the position shown in Fig. 1, when the shaft 10 is rotated the cam-plate will swing downwardly, the brake block and shoe moving down by their own gravity, assisted, if necessary, by a spring 19, which engages the link 13 and tends to swing it into a vertical position. The cam-plate is preferably so arranged that the brake-shoe rests upon the rail when the upper end of the link 13 is beneath the shaft 10, no power having` thus far been applied to the brake. When the parts have reached this position, as the shaft is oscillated still further the wheel 12 will ride along the inclined inner cam-face of the slot, thus positively forcing the shoe against the rail. The movement of the link 13 in the one direction is preferably limited by a stop 20, which prevents its being carried beyond a vertical position. Upon the shaft being rocked in the opposite direction the toothed wheel will ride down the outer surface of the slot in the cam-plate until it reaches the end of the slot, and the further swinging of the plate will then swing the link 13 and lift the brake-block, the parts again resuming their normal positions.

IOO

The advantages of my invention result from the fact that the brake-shoe is lowered substantially into contact with the rail before power is applied thereto. The power is therefore entirely utilized in pressing the shoe against the rail. The cam acts to both force the shoe down and lift it up, while the teeth of the cani prevent slipping of the roller along its face. These teeth may or may not be used, as desired. A strong and simple construction is aiorded, which may be easily and cheaply made and is not liable to injury or accidental breakage, while the wearing of the shoe may be taken up by adjusting the case vertically.

Many changes may be made in the form and arrangement of the parts without departing from my invention, since What I claim is- 1. In a rail-brake, a verticallymovable brake-block, a rock-shaft carrying a double cam, and a swinging link connected to the brake-block and having a roller acted upon by the cam, substantially as described.

2. In a rail-brake, a verticallymovable brak e-block,a rock=shaft, connections between the shaft and the block, said connections bein g arranged to allow the block to drop downwardly by gravity before power is applied, and then positively force the block against the rail, and a spring arranged to aid in the action of gravity and force the block downwardly.

3. In a car-brake, a rock-shaft carrying a slotted cam-plate, and a swinging link having a roller movable within the slot, said link being connected to the brake-block, the camplate being arranged to swing and lift the link after its roller reaches the end of the slot, substantially as described.

4. In abrake, a rock-shaft carrying a plate provided with an inclined curved slot, a depending link having a roller movable in said slot, a brake-block pivotally connected with the link, and a case inclosing the brake-block, and having guides therefor, substantially as described.

5. In a brake, a rock-shaft carrying a slotted cam-plate, the slot having teeth engaging a toothed roller carried at the end of a swing ing link, and a brake-block pivoted to the lower end of the link, substantially as described.

6. The combination with a casting arranged to be bolted to a truck-frame, of a brake-case adjustably connected thereto, and a brakeblock vertically movable in the case, substantially as described.

'7. In a rail-brake, a block arranged to bc secured to the truck-frame, and a brake-case secured thereto and having a rib entering the block, substantially as described.

In testimony whereof I have hereunto set my hand.

WILLIAM W. GEORGE. Witnesses:

C. E. MACKOWN, G. I. HoLDsHIP.

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