US1980686A - Railway brake - Google Patents

Description

Nov. 13, 1934- c. c. KINSMAN 1,980,686

RAILWAY BRAKE Filed June 24, 1932 2SheetsSheet 2 Patented Nov. 13, 1934 UNITED STATES PATENT OFFICE Universal Draft Gear Attachment Company,

Chicago, 111., a corporation of Illinois Application June 24, 1932, Serial No. 619,033

2 Claims. (01. H -505) This invention relates to railway brakes, and, more particularly, to manually operated brake operating mechanism.

One of the objects of the invention is the 6 provision of a new and improved brake operating mechanism having novel means for releasing the brake drum from the hand wheel, whereby the brake drum may move to release position independently of the hand wheel or lever.

Another object of the invention is the provision of a new and improved brake operating mechanism having novel means whereby the brakes, when applied by such mechanism, may be gradually released by the hand wheel, or the hand wheel may be released from operative connection with the mechanism for permitting the drum to rotate without moving the hand wheel.

A further object of the invention is the provision of a new and improved brake operating 20 mechanism that is simple in construction, inexpensive to manufacture, eflicient in operation, easily assembled and which is composed of few moving parts.

Other and further objects and advantages of 25 the invention will appear from the following description, taken in connection with the accompanying drawings, in which Fig. 1 is an elevation of a portion of a railway car showing the invention in position thereon;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a perspective view of the pawl operating member;

I Fig. 4 is a perspective view of the pawl; Fig. 5 is a perspective view of the eccentric bearing;

Fig. 6 is a section on line 66 of Fig. 7 and Fig. 2;

Fig. 7 is a section on line 77 of Fig. 2 and 4 Fig. 6;

Fig. 8 is a view similar to Fig. '7 but showing the brake operating mechanism in released position;

Fig. 9 is a section online 99 of Fig. '7.

It is common practice in hand operated brakes to so construct the mechanism that when the brakes are released, the hand wheel is caused to spin. Such an arrangement is objectionable in that the brakeman is likely to move his hand or person into contact with the spinning wheel and suffer an injury either by such contact or by the rotating wheel causing him to fall from the car.

The present invention seeks to remedy this defect by the provision of novel means for releasing the operative connection between the hand lever or wheel and the winding drum when it is desired to completely release the brakes.

It is sometimes desirable that the brakes be only partially released and to provide for this contingency means are provided whereby the brakes may be partially released without disconnecting the brake operating lever or wheel from the brake operating mechanism.

Referring now to the drawings, the reference character designates the end of a railway car on which thebrake operating mechanism 11 is mounted. This mechanism comprises aoasing 12 secured to the car. This casing comprises a base .plate 13 and acover plate 14, which together form an enclosure or recess openat its lower end.

- Mounted within the casing on-aspindle 15 is abrake drum 16. The drum is provided with a radially extending arm 1'7, which may be bifurcated for receiving alink 18 of the operating cable. 19., A-pin 21 anchors the cable to thearm 17.

Movable with the brake drum, and preferably, though not necessarily, integral therewith is aspur gear 22 for operating said drum. Apinion 23 rigidly secured to ashaft 24 meshes with the gear for rotating the same. The shaft 24' is eccentrically journaled in abearing block 25 which, in turn, is rotatably mounted inbearings 26 and 27 on thecasing 11. Ahand wheel 28 is rigidly secured to the outer end of theshaft 24 for operating the same.

Thebearing block 25 has arecess 29 for providing a clearance for thepinion 23 when the parts are assembled. This block is also provided withlugs 31 and 32 for engaging a holding pawl and weight member, as will presently appear.

Theblock 25 has its ends reduced for engaging thebearings 26 and 27 and has rigidly attached to its inner end alever arm 33, by means of which the block may be rotated in thebearings 26 for raising and lowering thepinion 23 into and out of mesh with thegear 22.

Suitable pawl and ratchet mechanism is provided for holding the brake in its set position. In the form of construction selected to illustrate one embodiment of the invention, this mechanism comprises apinion 34 which meshes with the brakedrum operating gear 22. This pinion is rotatably mounted on theshaft 35 and rigidly connected to the pinion, as, by being integral therewith, is aratchet wheel 36. This ratchet wheel is adapted to be engaged by a 2.pawl 37 pivotally mounted on'thepin 38. The pawl is provided with a projectingarm 39 which is adapted to engage theprojection 32 when thebearing block 25 is rotated by thelever arm 33.

A suitable weightedpawl engaging member 41 is provided for holding thepawl 37 in released position, as will presently appear. This member is pivoted to thepin 38 on which thepawl 37 is mounted and is provided with arecess 42 for receiving the pivoted portion of the pawl.

Afinger 43, see Figs. 3 and 8, below therecess 42 is adapted to engage the pawl 3'7 below its pivot and afinger 44 .above therecess 42 is adapted to engage the projectingarm 39 for limiting the upward movement of the pawl, as will presently appear. The member. 41 is also provided with a projection orfinger 45 which is adapted to project in the path of thelug 31 for engaging beneath the same for holding theweighted end 46 of. themember 41 in elevated, or inoperative, position whilethe brakes are being applied. a

When it is desired to partially release the brakes by reversing the movement of the hand wheel, the lever'33 is moved to upright position which will move the lug' 31 out of engagement with theprojection 45, but will not disengage thepinion 23 from thegear 22, thereby permitting theweight 46 to move thefinger 43 into engagement with the pawl for moving the same out of engagement with the'ratchetWheel 36 when thebrake wheel 28. is slightly advanced. forv relieving the pressure on the pawl.

The rotation of thewheel 28 can'now be reversed to release the brake the desired amount. Thelever 33 may now be returned to its former position and the weight of the projecting arm will cause the pawl to engage the teeth of theratchet 36 for holding the brake in adjusted position. When it is desired to entirely release the brakes, thelever 33 maybe moved through 180 degrees from that shown in Fig. 7 to" that shown in Fig. 8.

The rotation of the eccentric bearing block 25' will raise thepinion 23 outof engagement with. thegear 22 of the brake drum and thelug 32 engaging beneath the projectingarm 39 of the pawl will positively hold said pawl in inoperative position, thus permitting the brake drum to spin in reverse direction for releasing the brakes.

In releasing the brake operating mechanism, the movement of thelever 33 will first disengage thepinion 23 from thegear 22. The weightedmember 41 will tend to move the pawl to inoperative position but is not sufficient to release the pawl. On further rotation of thelever 33, thelug 32 will engage the projectingarm 39 for positivelydisengaging the pawl and permitting the drum to freely unwind. When it is desired to operate the drum for setting the brakes, thelever 33 is moved to the position shownin Fig. 7 for lowering thepinion 23 into engagement with thegear 22 and for causing the projection orlug 31 to engage thefinger 45 for moving theweighted portion 46 of the pawl engaging member to inoperative position. The weight of the pawl will then hold the same in engagement with the ratchet teeth of theratchet 36.

What I claim, therefore, is:

1. In a brake'operating' mechanism, a "brake drum, a gear movable with said drum, a brake operating shaft, a pinion on said shaft engaging said gear/for rotating said drum, an eccentric bearing iorsaid. shaft, a lever arm secured to saidbearing for rotating the same, a lug on said bearing, a second pinion engaging said. gear, a

ratchet wheel movable with said second named.

pinion, a pawl engaging said ratchet wheel, said pawl having an extension. positioned above said eccentric bearing, a pawl operatingiweighu having a finger for engaging said lug for. holding said weight in inoperative position when said bearing is in one position, a projection on said weight for engaging. said pawl for releasing the same when said lever ,arm is in another: position and means'on said bearing for engaging said pawl extension-"for positively holding said pawl in inoperative position when said lever arm is moved to a third. position.

2. Inarailway brake operating mechanism, a brake drum, brake operating mechanism for operating said drum, said mechanism comprising a gear and pinion, a shaft for operating said pinion, a pawl for holding said drum in brake holding position, a shifting member, and means for automatically releasing said pawl when said member is moved to one position and said drum is slightly advanced, and means for releasing said drum from said shaft when said member is moved to another position.

- CHARLES C. KINSMAN. I

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