US703614A - Car-brake. - Google Patents

Description

. Patented July I, I902. F. W. ROCK.

CAB BRAKE (Application filed Oct. 19, 1901.)

(lo Model.)

INVENTOR.

WY-IWES 12.52 fi/wa Q I UNITED STATES- PATENT, OFFICE.

FREDERICK W. ROCK, OF DETROIT,-MIOHIGAN, ASSIGNOR OF THREE- FOURTHS TO ROLLIN OFSPRAGUEyEDWARD H. PATTERSON, AND JAMES A. M. MORETON, OF DETROIT, MICHIGAN.

cAR-BBAK E.

SPECIFICATION forming part of Letters Patent No. 703,614, dated July 1, 1902.

Application filed October 19, 1901'. M N (N0 model-l 4 To all whom, it may concern Beit known that I, FREDERICK W. Rock, a citizen of the United States, residing in Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements'in Car-Brakes; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilled in the art to which? it appertains to make and use the same, reference being had to the accompanyingdraw-Z ings, and to the figures of reference marked thereon, which form a part of this specification.

The objects of the invention are to provide simple and efficient means for quickly setting the brake-shoes to the wheels by a direct application of power and when so set to apply the requisite pressurethereto through mech- 1 anism whereby a great increase of poweris obtained, enabling the operator to easily control the'car through the manipulation of the hand-wheel connected with the brake mech anism. r

A further object is to provide a quick release for the brakes after being set.

The above objects are attained by the mechanism illustrated in the accompanying drawings, in which-i Figure 1 is a vertical sectional view through my improved brake -mechanism and through the platform of a car upon which said mechanism is mounted. Fig. 2'is a detail, partly in section, of the releasing-lever. Fig. 3 is a plan view of the-ratchet-driven gear-wheeland a transverse section through the shaft upon which the ratchet is keyed. Fig. l is a horizontal section as on line 4L 4 of Fig. 1.

Fig. 5 is a like section on line 5 5 of Fig. 1.

Referring to the characters of reference, 1 designates the platform 'of'a car upon which the brake mechanism is mounted. Attached to the under side of said platform is a case or housing 2, in which the operating-gears are located and through which passes the "brake-operating shaft 3, that extends vertically through the car-platform and carries at its upper end the hand-wheel 4. The shaft 3 is journaled in the case 2 where it passes therethrough, and the lower end of said shaft is journaled in a support 5, connected by a suitable brace 6 to the frame of the car, whereby the lower end of said shaft is suitably braced to withstand the draft of the brake-chain.

Loosely mounted upon the lower end of the shaft 3 is a spool 7, upon which the:brakechain 8 is adapted'to wind, .the opposite end system of brake-levers. (Not shown.) S'plinedtothelower end of the shaft 3 is a clutch-collar f), adapted to engage the projec'ting shoulders 10 on the platell, seated fofsaid chain being'attached to any's'uitable This invention relates to car-brakes; and it consists in the construction and arrangement of parts hereinafter fully set forth, and pointed out particularly in the claims.

in a recess in the under side of said spool and secured by'suitable screws 12. Journaled in a channel in'the periphery of the clutch-collar'is' a ring 13, secured by a pin 14 to alever 15. One end of said lever is fulcrumed at 16 to a support17 depending fromthe car-frame, and at the opposite end thereof is attached a coiled spring .18, whose tension is exerted to normally hold the clutch-collar in engagement with the spool 7, whereby by a rotation of the shaft 3 through the medium of the hand-wheel 4. said spoolwill be revolved by the clutch 9 and the chain wound thereon to carry the brake shoes into contact with the wheels of the car. j Through the arrangement above described the slack of the. chainmay be quickly taken up to set the brake-shoes against the carwheels; but no great power can be exerted on the brakes, owing'tothe fact that a-direct application only is made of the strengthof the brakeman or operator. To provide for an increase of leverage over the brake-shaft for the purpose of forcibly applying ,the brakeslioes to the wheels after they have been brought into'cont'act therewith as above described, a second hand-whe'el19 is employed, of somewhat-larger diameter than the handwheel 4. and located slightly below said lastmentioned wheel, but concentric therewith.

Said hand-wheel 19 is attached to the upper end of the hollow shaft 20, through which the shaft 3 passes and which is adapted to turn independently of said shaft. The lower end of the hollow shaft 20 is firmly secured in a vertical sleeve 21, projecting from the hub of a pinion 22, loosely mounted upon the shaft 3. Meshing with the pinion 22 is a large gearwheel 23, which is journaled in the case 2 and carries therewith a pinion 2%, which in turn meshes with a large gear-wheel 25, also loosely mounted upon the shaft 3, but made to rotate said shaft when driven through the pinion 2-1 by means of a ratchet-wheel 26, which is secured to the shaft 3 by a key 27 and occupies a recess 28 in the upper face of the gear-wheel 25. Mounted upon said gears wheel 25 are the pawls 29, which engage the teeth of the ratchet 26 and are backed by the springs 30. It will therefore be seen that as said shaft 3 is rotated to the right by means of the hand-wheel 4 the teeth of the ratchet 26 will slip past the pawls 29 without imparting movement to the gear-wheel 25, but that when said gear-wheel is driven through a rotation of the hollow shaft 20 the pawls 29 will drive the ratchet-wheel 26 and impart a rotation to the shaft 3 and to the spools 7, carried at the lower end thereof, through the medium of the interposed gears connecting the hollow shaft 20 with the gearwheel 25, whereby a great increase of leverage is obtained and the operator is enabled to easily apply any pressure required to stop the car with the expenditure of comparatively little power upon the hand-wheel 19.

Mounted upon the hollow shaft 20 is a ratchet-wheel 31, located above the platform of the car and adapted to be engaged by a detent or dog 32, pivoted on said platform and backed by a spring 33. This dog is normally held in engagement with the ratchet by the spring 33 and prevents a backward turning of the spool carrying the brake-chain,whether operated through the hand-wheel at or the hand-wheel 19. Should the operator wish to slightly release the brakes after being set, the dog 32 may be disengaged from the ratchet by the foot of the operator, when the brakes may be eased off byallowing the hand-wheel 19 to turn backward. In this manner the car may be perfectly controlled by the operator through the manipulation of the hand-wheel 19, as the great leverage which the train of gears furnishes over the brake mechanism enables the operator to readily hold the brakes at any point and increase or decrease the power thereon at will. After the car has been stopped and it is desired to release the brakes a vertical rod 34 is employed, which passes through the platform of the car and is attached at its lower end to the 16V81'15, the upper end of said rod carrying a tread-plate 35, whereby the operator by stepping upon said plate may force the lever 15 downward to disengage the clutch from the spool 7, when said spool may turn freely upon the shaft 3 and allow the brakechain to unwind therefrom. After the pressure has been removed from the tread-plate 35 the spring 18 will raise the lever 15 and reengage the clutch with the spool 7.

To enable the brakes to be released while the motorman is seated, a lever 36 is employed, which is pivoted at 37 to the platform of the car and is provided with a bell-crank 38, to the free end of which is pivoted a verticall ymovable rod 39, which passes through the platform of the car and is provided at its lower end with a fork 40, which sets astride of the lever 15, said fork being held in place by the pins 41, which extend from the lever 15 on opposite sides thereof. By a manipulation of the lever 36 the lever 15 may be depressed to disengage the clutch from the spool 7, as will be well understood. The forked engagement of the rod 39 with the lever 15 is such that when said lever 15 is depressed, by means of the tread-plate 35, the lever 36 remains inactive.

Having thus fully set forth my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In abrake, the combination of the brakeshaftto which the brake-chain is connected, means for rotating said shaft to make a direct application of power to the brake-chain and a train of gear-wheels continuously in gear connected to the brake-shaft whereby the power may beindireetlyapplied to the brakeshaft in a manner to obtain an increased leverage thereon independently of the direct means for rotating said shaft.

2. In a brake, the combination of a brakeshaft upon which the brake-chain is adapted to wind, said shaft carrying a hand-wheel, or other means of rotating it, to wind up the brake-chain, a train of gears connected with the brake-shaft and means for operating said gears to rotate the brake-shaft independently of the operating means connected directly thereto.

3. In a brake, the combination of a shaft adapted to wind up the brake-chain, means for rotating said shaft by a direct application of power thereto, a train of gears connected with said shaft whereby the power which is applied to the shaft may be compounded, a hollow shaft connected with said gears embracing the brake-shaft and means for rotating said hollow shaft.

4. In a brake, the combination of a brakeshaft adapted to wind the brake-chain thereon, means directly connected with said shaft for rotating it, a ratchet-wheel on said shaft, a gear-wheel loosely mounted on the shaft and carrying a pawl which engages said ratchet, a gear and pinion engaging said ratchet-carrying gear-Wheel and means for operating said gears to impart a rotation to said shaft through said ratchet.

5. In a brake, the combination of a brakeshaft, means connected directly with said IIO shaft for rotating it, a hollow shaft embracingthe brake-shaft, a ratchet-wheel fixed on the brake-shaft, a series of gear-wheels connecting said hollow shaft with said ratchet and means for rotating said hollow shaft.

6. In a brake, theoombination of a brakeshaft, a ratchet fixed on said brake-shaft, an independent shaft carrying a pinion, gears interposed between said pinion and said ratchet and means for rotating said independent shaft to apply movement to the brakeshaft through said ratchet and gears.

7. In a brake, the combination of a brakeshaft, a spool loose upon said shaft adapted to be connected with the brake-chain, a clutch splined upon said shaft and normally engaging said spool, means for rotating the shaft directly to wind the brake-chain upon the spool, a series of gear-wheels connected with said shaft whereby it may be rotated indirectly to obtain an increase of power, means for rotating said gears and means for releasing said clutch.

8. In a brake, the combination of a brakeshaft, means for rotating the shaft directly to wind the brake chain thereon, a ratchetwheel fixed on the brake-shaft, a gear-wheel loose on the shaft and connected by a springpawl with said ratchet, a hollow shaft embracing the brake-shaft, a pinion on said hollow shaft, gears connecting said pinion with the gear carrying the pawl, and means for rot-ating said hollow shaft.

9. In a brake, the combination of the brakeshaft, a spool loosely mounted thereon adapted to wind up the brake-chain, a clutch-collar splined on said shaft normally in engagement with said spool, means for rotating said spool directly and indirectly a verticallymovable lever connected with said clutch and.

means for depressing said lever to disengage the clutchfrorn the spool.

In testimony whereof I sign this specification in the presence of two witnesses.

FREDERICK W. ROCK. Witnesses:

E. S. WHEELER, 0. E. J OSLIN'.

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