US709981A

US709981A - Car-brake.

Info

Publication number: US709981A
Application number: US7410001A
Authority: US
Inventors: George M Griggs
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-09-03
Filing date: 1901-09-03
Publication date: 1902-09-30
Anticipated expiration: 1919-09-30

Description

No. 709,98. Patented Sept. 30,v |902.

Gv. M. GRIGGS.

CAB BRAKE.

[Applicaion led Sept. 8,1901.) (No Model.) 2 Sheets-Sheet No. 709,9al. Patented sept. 30, 1902.

G. M. umass.

CAR BRAKE.

' (Application led Sept. 3, 1901.) (No Model.) 2 Sheets-Sheet 2;

UNITED STATES vPATENT OFFICE.

GEORGE M. GRIGGS, OF SCOTTDALE, PENNSYLVANIA.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent N o. 7'9,981, dated September 30, 1902.

l Application filed September 3. 1901. Serial No. 74,100. (No model.)

To all whom, it may concern.-

Be it known that I, GEORGE M. GRIGGs, a citizen of the United States of America, residing at Scottdale, in the county of Westmoreland and State of Pennsylvania, have invented certain new and useful Improvements in Car-Brakes; and I do hereby declare the following to be a full, clear, and eXact description thereof, reference being had to the accompanying drawings, which vform a part of this speciiication.

This invention relates to improvements in hand-operated car-brakes.

The object of my invention is to provide means ip connection with the ordinary handbrake mechanism, whereby increase of braking power is attained.

In the accompanying drawings Ihave illustrated my improvements as operatingly connected with a hand-brake of a car-truck, Ain which- Figure 1 isa side elevation of a car-truck having my improvements attached. Fig. 2 is a plan view of the same. Fig. 3 is an enlarged side view of one of the improved brake members removed from the truck. Fig. 4 is an end view of the same, Fig. 5 is a side view of the same with a portion thereof removed. Fig. 6 is an end view of the same with the portion removed. Fig. 7 is a perspective view of one of the cams employed in said mechanism to operate the brake-shoe. Fig. 8 is a perspective view of one of the blocks employed to hold the brake-shoe.

In the drawings at Figs. 1 and 2 I have shown a truck composed of aframe 1, truckbars 2, wheels 3, and aXles 4, to which is attached an ordinary hand-brake consisting of beams 5, suspended from the frame by rods 6, the ends of these beams being provided with shoes 7. A rod 8 extends'from the end of the oar and connects with the upper end of an upright bar 9', which is pivotally attached to one of the beams. A rod 10 connects the other beam with the lower end of the said upright rod 9'. `As these parts are not of my invention, the brief description thereto will suflice.

My improvements consist of a beam 1l, eX-

tending across and connected to the truckbars, to the ends of which are secured the plates 12. Attached to eachv of these plates by their upper ends is a pair of Vertical plates 13, between which is pivoted upon bolts 14 the pair of cams l5. These cams are connected at their upper ends to the brake-beams by rods 16. Blocks 17, having outwardly-extending shoulders 18 to engage in the opening 19 of the said vertical plates, are suspended from the cross-beam by springs 20. These blocks are each provided at their under side with dovetailed grooves to engage the tongues of the brake-shoes 2l.

The operation of my improved brake in conjunction with the hand-brake previously referred to is as follows: When the brakehandle is turned to force the beams 5 apart and set the brakes through the medium of the rods 8, 9, and 10, the movement of said beams Yat the same time operates the cams 15, through the medium of the rods 16, and forces the shoes 21 down, as shown at Fig. 5, to engage the rails, thereby giving increased braking power. When the handbrake is released, the springs 20 elevate` the shoes to their normal or inactive position.

.Having thus fully shown and described my invention, what I claim as new, and desire to secure by Letters Patent, is- A The combination with the brake-beams having shoes at each end and adapted to engage the wheels, and means of forcing said shoecarrying beams toward the wheels, of a frame arranged at each side of the truck between the wheels, a pair of cams pivoted in each of said frames, rods connecting said cams with said'brake-beams, a block suspended in each frame by a spring to cause engagement with said cams, and a rail braking-shoe carried by each of said blocks, as shown and set forth.

In testimony whereof I have hereunto affixed my signature in the presence of two sub- /scribing witnesses.

eno. M. cruces.

Witnesses:

HENRY BANDRIDGE, H. C. HUBBs.