US1698728A - Hand brake - Google Patents

Description

Jan. l5, 1929.

' J. F. OCONNOR HAND BRAKE Original Filed May 20, 1925 Patented dan. 15, i929.

UNITED ,STATES JOH'N F. OGONNOR, OF -CHICAGO, ILLINOIS, ASSIGNOR vlTO .'H.

.PATENT -o-Fri inc., QF

CHICAGO, ILLINOIS, A CORPORATION lOF DELAWARE.

HAND BRAKE.

Application filed May 20, 1926, Serial This invention relates lto hand brakes.

One object of the invention isato vprovide a simple and Aeflicient hand brake, wherein means are provided vfor vrapidly taking up the slack in the brake chain, and subsequently increasing the ratio of leverage to exert `greater Vforce in the final application of the brakes.

Another object of the invention is to provide a hand brake of this character wherein lever means are interposed in the brake rigging between the brake winding sta'if and the brake mechanism proper, and resiliently held against movement in an operative direction, said lever means permitting free travel of the rigging with respect thereto, while quiescent, during taking up .of the slack, and being `antomatically operated by increase of tension in the rigging to effect swinging thereof to increase the A.power ratio during final application of the brakes in conjunction with mechanism for arresting travel of said rigging with respect to said lever means, which mechanism is automatically moved to operative position or released` therefrom by said rigging, dependent upon variations of tension therein.

Other further objects and advantages of the invention will more fully Aand clearly appear from the description and claims hereinafter following.

In the drawing forming a part of this specification, Fig. 1 shows fragments of a car structure, illustrating a top plan view ofthe invention as applied thereto, with parts .of the same shownin section. And Fig. 2 is a part sectional, and part elevational view of the invention, taken substantially on the line 2 2 of'Figzl.

In said drawing, 4f indicates a fragment of the end sill of a car, which is provided .witha 'depending stirrup 5 in which is mounted the usual winding staff 6, said sill l being provided with an inwardly extending bracket 7 upon which the lever means are mounted.

The lever means comprise spaced bars 8 and 9 arranged in substantially parallel relation, one end portion of the bar V9 having an 'angular extension 10, a portion-of which Arests upon the upper surface of the vbracket 7, while thel bar `8 has one end arranged to rest upon ythe extension 10, afpivot pin 11l extending through the end ofthe bar'8, the extension 10, and the 9, said in being No. 110,373. Renewed April 23, v19728.

held :in position bythe usual cotter pin `12, the arrangement affording a :fulcrnm for the lever means adjacent one `end thereof upon the car structure. The bars Sand 9 are connected together, Aand contain operative parts hereinafter referred to, said barsbeing Vsubstantially o'f the same length, and the free ends thereof being conlinedto limited swinging movement in a horizontal direction by guide means indicated at 13. 'Said guide means include spaced horizontally extending guiding surfaces 14: which confine the end of the lever means to horizontal movement, the swinging movement of the free endfof the lever means being limited 'in an inward direction by a stop 15, and in an outward direction by a stop 16.

Adjacent the free ends of the bars '8 and 9, there is provided a vcarrier 17 which is disposed between the bars 8 'and 9 and comprises spaced elongated plates 18 and 19, which are held in spaced relation by means of agspacing member 20, said plates being secured together at one corner by a rivetf2l. The spacing member V2O is disposed-adjacent another corner of the carrier as shown, and extending through said spacing member, the plates 1S and 19, and the ends of the bars 8 and 9, is a pivot pin 22, which pivotally connects the carrier 17`for swinging movement with reference to the bars '8 and 9. At the free end portion of the carrier 17 opposite fhevpivot 22, there is mounted between the plates 18 and 19 a sheave 23, which is rotatably supported iLpon its hub 24, sai-d shea'vc being provided with circumferentiallv .arranged recesses, indicated at 124;, for the reception of the links 'of the chain forming the brake rigging, as hereinafter referred to, said sheave operating .as a sprocket wheel in the device. `Ratchet wheels 25-25 are provided at each side ofthe sheave .23, and are .fixed with respect to said sheave and rotate. in unison therewith.

Mechanism is provided which .normally pulls said carrier in a vdirection awayfrom the lever means, said `mechanism including a connecting rod26 which is pivotally connected to the carrier 17 Vat a point intermediate, and to one side of, the :22 and 24, as shown, said connecting rod having at its outer end a cross lheard 27 which is Aslidably mounted upon the arm'sr28-2'8 of aydke, the freel ends `-of Athe-.alims beingfcorinected by a plate '29- Whiehforms a. spring abutment,

the plate 29 being held upon the arms 28-28 by suitable'nuts. A coiled spring 30 is disposed about the connecting rod 26, one end of said spring bearing against the cross head QT-and the opposite end oi the spring bearing against the plate 29. The bight 3l et the yoke is connected to a fixed part olf the car structure, indicated at 32.

Aliixed to the lever means, adjacent the ratchet wheels 25-25 mounted upon the carrier 17, is a bracket having angular portions which are riveted to the bars 8 and 9 of the lever means, and which are connected by a web 34, said web on its inner surface, between the bars 8 and 9, being provided with a rib 85 which acts as a :liXed pawl, adapted to cooperate with the ratchet wheels 25-25 in certain positions 'to prevent counter-clockwise rotation of the ratchet wheels Q-Q, and of the sheave 23.

Rotatably mounted upon the lever means, adjacent to but spaced trom the pivot or ttulcrum ot said lever means, upon a pin 3G extending through the bars 8 and 9, is a Vplain sheave 37. The brake rigging indicated at 3S, which is usually in the 'form ot a chain, has one end connected to the winding G,.extends thence over the sheave 23, around the sheave 3G, and thence to the brake mechanism proper, not shown.

In the normal position et the parts, the lever means are drawn inwardly away rom the end sill d by the spring 30, and associated parts, and the carrier member 17 is also drawn away from the lever means as indicated in Fig. l, so as to free the ratchet wheels 25-25 from engagement with the fixed pawl 35. Upon clockwise rotation of the winding statt 6, to take up the brake rigging 38, said rigging travels freely over the sheaves 3T and 23, due to the tact that the vtension in the rigging is relatively small and not sutlicient to overcome the strength of the spring which maintains the lever in its tully released position. Upon increasa-id resistance being developed in the brake rigging, due to the brake shoes coming into contact with the wheels, the torce exerted by the spring 30 will be overcome, causing the rtree end oil the carrier 17 to move inwardlyY toward the lever, until the ratchet wheels Q5 come into engagement Awith the tired pawl 35, thereby preventing counter-clockwise movement of the sheave 23, after which the rigging is taken up to effect tull application 'of the brakes through swinging movement ot' the lever means along the arc described by the sheave 37, as indicated in dotted lines in Fig. l, resulting in a great increase in power. TWhen the brake stad 6 is released, the action of the spring 30 is such as to re- Vtract the lever and carrier to fully released position, disconnecting the ratchet wheels 25-25 from the holding pawl 35, resulting in full unwinding oftheA brake rigging trom the stad G and consequent full release of the brake shoes.

lilliile I have herein shown and described what l now consider the preferred manner of carrying out my invention, the same is merely illustrative, and I contemplate all Achanges and modifications that come within the scope ot' the claims appended hereto.

l claim:

i.. ln a hand brake, the combination with winding means and the brake mechanism proper; of lever means interposed between said winding means and said brake mechanism proper, said lever means being arranged to swing about one end portion thereof as a tulcrum and being provided with spaced guides thereon, o ue of the same being arranged adjacent the fulcrum point of said lever means, and the other connected adjacent the free end portion of said lever means, said second guide being bodily movable with reference to said lever means; and rigging extending from said brake mechanism proper to the guide means adjacent said fulcrum, and over the guide means adjacent the tree end ot said lever means and thence to said winding means, said rigging being arranged to normally travel freely with respect to said guide means while said lever means are quiescent to take up 'the slack, and thereafter cooperating with said lever means to automatically effect swinging ot the same to increase the power ratio; and resilient means connected to said second guide means and to a fixed point for urging said secondguide and lever means toward released position.-

2. In a hand brake, the combination with winding means and the brake mechanism proper; oi lever means interposed between said winding means and said brake mechanism proper, said lever means being arranged to swing about one end portion thereof as a fulcrum and normally urged to released position, said lever means being provided with spa-ced guides thereon, one of the same being arranged adjacent the fulcruni point oi' said lever means, and the other adjacent the freeV end portion of said lever means; rigging extendingrom said brake mechanism proper to the guide means adjacent, said fulcrunn and over the guide means adjacent the tree end of said lever means and thence to said winding means,

'said rigging being arranged to normally travel freely with respect to said guide means to take up the slack while said lever means are quiescent and effect swinging movement Aot said lever means when the tension in said rigging increases and means for arresting travel of said rigging with reference to said lever means upon swinging movement ot the latter, said arresting means being automatically controllable by movements of said rigging.

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3. In a hand brake mechanism, the combination with a winding staff and brake mechanism proper; of lever means interposed between said stail:l and said mechanism and adapted to swing about one end portion thereof as a 'ulcrum; a carrier pivotallv mounted on said lever means adjacent the free end portion thereof, said carrier being provided with guide means thereon; guide means adjacent the tulcrum point of said lever means; means co-acting with said carrier to normallj,Y urge said carrier away from said lever means; rigging extending from said brake mechanism proper over the guide means adjacent the fulcruin point of said lever7 thence over the guide means on said carrier to said brake winding means;

and means i'or arresting and permitting movement ot said rigging over said guide means dependent upon variations of resistance in said rigging.

Li. In a hand brake, the combination with a winding stati' and brake mechanism proper; ot' lever means interposed between said stati' and said mechanism and adapted to swing about one end portion thereof as a tulcrum; a rotatable sheave mounted on said lever means adjacent the fulcrum thereof; a carrier piv-otally mounted on said lever means adjacent the free end portion thereof, said carrier being provided with a. rotatable sheave, ratchet members on said lever means and said last mentioned sheave adapted to co-act in certain positions to arrest rotation of said sheave; resilient means connectedto said carrier and normally maintaining said ratchet means and said lever in fully released position; and brake rigging extending over the sheave on said lever means, thence under the sheave on said carrier to said winding means.

5. In a hand brake, the combination with a winding statt and brake mechanism proper; of lever means interposed between said staff and said mechanism and adapted to swing about one end portion thereof as a fulcrum; a rotatable sheave mounted on said lever means adjacent the fulcrum thereof; a carrier pivotally mounted on said lever means adjacent the free end portion thereof7 said carrier being provided with a rotatable sheave: ratchet members on said lever means and said last mentioned sheave adapted to eosact in certain positions to arrest rotation of said sheave; resilient means connected to said carrier and normally maintainingl said ratchet means and said lever in fully released position; brake rigging extending over the sheave on said lever means, thence under the sheave on said carrier to said winding means; and means for guiding the free end of said lever means within predetermined limits.

In witness that I claim the foregoing I have hereunto subscribed my name this 17th day of May; 1926.

JOHN F. OCONNOR.

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