US349738A - Car-brake - Google Patents

Description

3 SheetS- -Shee't 2.

K R A P S H GAR BRAKE.

Patented Se FIGJV- N. PETERS. Phnlo-Lflhographer, Waihinglan, my a (No Model.)

. 3 Sheets-Sheet 3. H; s. PARK. I

GAR BRAKE. No. 349,738. PaQtentedSept. 28,1886,

UNITED STATES- PATENT OFFIGE.

' HARVEY s. PARK; or HENDERSON, KENTUOKYp CAR-BRAKE.

' SPECIFICATION forming part of Letters Patent No. 349,738, dated September 28,1886.

Applieationfiled September 10, 1835. Serial No. 176,710. (No model.)

To all whom it may concern:

Be it known that I, HARVEY S. PARK, a citizen of the United States, residing at Henderson, in the county of Henderson and State of Kentucky, have invented certain new and useful Improvements in Gar-Brakes, of which the following is a specification.

My invention relates-to those car-brakes in which the momentum of the car itself is utilized for winding the brake-chains, electromagnetic devices being employed for connecting the ear-wheel axle with the brakechain anism in unlocked position.

'My improvements have for their object the effectual locking of the brake mechanism at any degree of tension, as well as the throwing it out of action when desired.

For locking the brake-chain windlass at any point I provide the driving cylinder or wheel thereon with a circular rack adapted to be engaged in either direction by pawls thrown against it by the act of winding the brake chain, said pawls being locked against f said rack until it is desired to release the brakes, when they are thrown out of action by electromagnetic mechanism, which will be more fully described hereinafter.

In the accompanying drawings, Figure I is a side elevation of my improved brake mechanism applied to the axle of one of the truckbeams of a car. the same. Fig. 'III is a vertical sectional view of the driving wheel or cylinder on the brakechain windlass, showing the locking and unlocking mechanism therein in sideelevation. Fig. IV is a'detail View of a part of said mech- Fig. V is a plan v view, on a smaller scale, of a car-truck bearing 6, through the medium of bolts and slots, in

or feather, l, on the axle.

Fig. 11 is a front elevation of such manner as to be both horizontallyand vertically adjustable. Theother end of the windlass is supported by a bracket, 6".

7 is a collar keyed to'the axle 1, having a V-groove, 8, corresponding to a similar groove in the face of the cylinder 4. The part of drum or collar 7' having theV; groove 8, and

also the other end, 8, of such drum, are made to project somewhat beyond the surface of the drum, and between them is received a twopart strap, 3, rigid with the frame 3, and thus serving to support one end of said frame from the axle by means of said drum.

The drum 7 is formed in two parts, as shown, one part having a groove extending throughout the length of said drum, receiving a pin The drum is thus forced to accompany anymo'vement of the frame 3 longitudinally of the axle, while itis at the same time compelled to accompany the axle in its rotation. Any slight .vertical movement which may be necessary between the drum and axle may be obtained by making the interior diameter of the drum slightly larger than the external diameter of the axle, as shown.

9 is an'idle friction-wheel having a V-ridge for engaging in the grooves in collar 7 and cylinder 4. It is supported on the shorter arm of a bell-crank lever, 10, which is pivoted at 11 on the frame 3. At top said lever is pivoted by pin and slot or similar flexible connection to the end of a rod, 12, rigid with the hollow core or other shaped armature, 13, of an electro-magnet, 14, which is fixed rigidly to the side of the frame 3. Such magnet lies in a circuit running throughout the train or including the magnet 011 every car bearing this braking mechanism, the current therein being controlled at will, in customary manner, by the engineer or conductor.

By establishing the current through the electro-magnet 14 the armature 13 is drawn in and diverted from the magnet 14, the 'armature 13 will be released, and the roller 9 will fall away from the collar 7 and cylinder 4, thus allowing the brake-chain to freely rotate the said cylinder and release the brakes. It is, however, frequently desirable that the brakes should be held to some set degree of tension after. the power for applying them has been withdrawn. For this purpose I arrange locking mechanism automatically thrown into operation by the rotation of cylinder 4, adapted to prevent a reverse movement of such cylinder after the disconnection of the brake-chain -winding mechanism. This mechanism will now be described.

is an arm or lever keyed or otherwise rigidly fixed to a pin or shaft, 16, passing through a journal in the frame 3, and carrying on the inside of said frame a rigid arm, 17. Said arm 17 is pivoted at 18 to a lug, 19, forming part of a yoke, 20, which carries a tooth or projection, 21, adapted, when said yoke is lifted into the position shown in Fig. III, to be engaged by a similar tooth or pro jection, 22, on the brake-chain Windlass 5.

23 23. are levers pivoted at 24 on the inside of frame 3 and carrying pawls 25, which in their normal position, as shown in Fig. IV, rest upon pins or shoulders 26,proj ecti n g from the frame 3, but which may be thrown over by a movement of the levers 23, so that one or other of said pawls 25 will engage with the rack 27 on the inside of cylinder 4.

28 28 are dogs pivoted to the upper ends of levers 23, and sliding in ways provided for them in a block, 29, rigid on the frame 3, and recessed at bottom, as shown at 30, to receive the nose 31 of a stop, 32. Shoulders 33 on the dogs 28 are arranged to engage on the nose 31 when said dogs are thrown outward, as shown at the left of Fig. III, and when said stop 32 is in its normal elevated position, as shown in both Figs. III and IV. The stop 32 is kept from sidewise movement by engagement with the sides of the recess 30, and is supported at bottom by an arm, 34, rigid on a pin or shaft, 35, journaled in the frame 3, and carrying outside said frame an arm or lever, 36, connected by pin and slot with the rod 37 and armature 38 of asecondelectro-magnet,39.

The following is the operation of the abovedescribed locking and unlocking mechanism: When, by the throwing of the current into the electro-magnet 14, the lever 10 is oscillated to bring the roller 9 into contact with collar 7 and cylinder 4, and thus wind up the brakeehain, the said lever carries with it the arm or lever 15, which thus, by means of shaft 16 and arm 17, elevates the yoke to such a position that its tooth or projection 21 is engaged by the tooth or projection 22 of the brakechain windlass 5, whatever the direction of its rotation. If it be moving in the direction of the arrow, Fig. III, the tooth 22, engaging on the tooth 21, will force the yoke 20 to the left, and a pin or projection, 40, on one side of said yoke, engaging with the lever 23, will throw the pawl out into engagement with the rack 27 where it is held by the shoulder 33 on the dog 28 dropping into engagement with the nose 31 of stop 32. An abutment being thus provided for the pawl 25, while it will permit the rack 27, and consequently the cylinder 4, to continue revolving in the direction of the arrow, III, so long as it is actuated by the rollers 7 9, it will not permit its movement in a reverse direction. Thus, it at any time the circuit through the magnet 14 be broken and roller 9 allowed to drop, the brakes will be maintained at the same tension. It is obvious that the same action will take place on the other system of pawls and lever at the otherside of the frame 3 should the brake-chain windlass 5 be revolving in the opposite direction, owing to a contrary movement of the carwheel axle from which it is driven. The brakes being thus applied and locked, and the circuit through magnet 14 having been broken, the roller 9, lever 15, and yoke 20 are all allowed to fall, so as to offer no impediment to the free rotation of the ear-wheel axle, or that of the brakechain Windlass, should it'be re leased by the removal of pawl 25 from engagement with the rack 27. When it is desired to release the brakes,,therefore, it is simply necessary to close the circuit through the magnet 39, thus raising its rod 37 and arm 36, rocking the pin or shaft 35, and depressing the arm 34 until the stop 32 and its nose 31 are brought sufficiently low to disengage with the shoulder or inner end of dog 28. At this point the back pressureon pawl 25 throws said pawl and the lever 23, carrying the same, back to the position shown in Fig. IV. The cylinder 4 is thus released and the brake-chain allowed to unwind, releasing the brakes. The circuit through magnet 39 being then broken, the Weight of the armature 38 and the parts 36 37 is sufficient to raise the stop 32, as shown in Fig. IV, again into position to engage with the shoulders or inner ends of the dogs 28, when the brakes are again applied.

It will be seen that when the pawls 25 are thrown away from the rack 27 the centers of gravity of the levers 23 are thrown beyond the pivot-pins 24, on which said levers are supported, so that there is no tendency of the said levers and the pawls 25 to reassume the locking position against the rack 27 until thrown into operation by the oscillation of the yoke 20.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1. The combination, with a beam, bracket extending therefrom, and an axle, of the windlass,winding-wheel on the Windlass, cover having a two-part strap surrounding the axle, and means for transmitting motion from saidaxle to said wheel, substantially as set forth.

2. The combination, with a beam, bracket extendingtherefrom, and an axle, of a drum secured to the axle, a frame, 3, supported on the bracket and having a two-part strap surrounding the drum, a Windlass having a winding-wheel and jouruaied iii the frame, and means for transmitting motion from said drum to said wheel, substantially as set forth.

3. The combination, with a beam, bracket extending therefrom, and an axle, of a drum and aframe supporting the brake-chain-winding mechanism, and having a two-part strap surrounding the drum, the drum permitting the axle to have longitudinal movement therein, substantially as set forth.

4. The combination, with a frame, beam, axle, and windlass, of a winding-wheel, 4, having a friction-groove, a drum, 7, having a friction-groove, 8, abell-crank lever, 10, journaled to the frame and having friction-wheel 9 working in said grooves, means for operating the lever, and means for locking and unlocking the winding-wheel, substantially as set forth.

5. The combination,with a frame, axle, drum on axle,windlass, and winding-wheel, of a bellcrank lever hinged to the frame and provided with a friction-wheel working between the drum and winding-wheel, armature 13, magnet 14, rod 12, connecting the lever and armature, and means for locking the leverin operative position, substantially as set forth.

6. In combination with a circular rack connected with the brake-chain Windlass, pawls adapted to engage therewith in opposite directions, levers on which said pawls are mounted, and mechanism for operating said levers from the brake-chain windlass, substantially as described.

7. In combination with a winding-whee], having a circular rack within the wheel and connected with the brake-chain Windlass, and

' a pawl adapted .to engage the rack, a lever carrying said pawl, mechanism for operating said lever, and a stop or lock for said lever, substantially as set forth.

8. In combination with a circular rack conadapted to engage therewith in opposite directions,-and lev'er's' for carrying said pawls, a yoke adapted to engage with a projection of the brake-chain Windlass and to oscillate said levers, substantially as and for the purpose set forth.

9. In combination with a winding-wheelhaving a circular rack within the wheel and connected with the brake-chain Windlass, pawls adapted to engage the rack, levers carry ng said pawls, and pins or projections rigid with the frame for supporting said pawls when out of contact with said rack, substantially as set forth. 3

10. In combination with a rack and pawls for locking the brake-chain Windlass, levers carrying said pawls, and dogs on said levers, a stop for engaging with said dogs, substantially as and for the purposes set forth.

11. In combination with the brake-chainwinding mechanism and a lever for throwing the same into operation, a second arm or lever operated by the first and adapted to throw the brake-locking mechanism into operation, substantiall y as described.

12. In combination withabrake-chain windlass, a rack rigid therewith, and apawl adapted to-be thrown into engagement with said rack, astop or bolt arranged to hold said pawl against said rack, and an electro-magnet armature connected with said stop or bolt, and an electric circuit including said magnet, substantially as described.

13. In combination with the block 29, fixed to the frame 3, the dogs 28, sliding therein, and the stops 32 31, occupying a recess in said block 29, and adapted'to engage the shoulder or ends ofsaid dogs, substantially as and for the purposes set forth.

HARVEY s. PARK.

Witnesses:

E. A. PARK, J. G. BALEE.

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