US2439941A - Hand brake - Google Patents

Description

April 20, 1948. H. J. LCJUNSBURY 2,439,941

HAND BRAKE Filed May 11, 1946 iatented Apr. 20, 1948 W. H. Miner, Inc.,, Chic of Delaware I ago, I l l., a corporation Application May-11, 1946, Serial No. 669,070

This invention relates to improvements in hand brakes of the power multiplying type, especially adapted for railway cars.

One object of the invention is to provide a hand brake mechanism of the character. indicated including a chain winding element or drum and means actuated by the usual hand wheel for;

1 Claim. (01'. 74 505) means for rotating the drum to wind the chainv Other objects of the invention will more clear- 1y appear from the description and claim hereinafter following.

In the drawing forming a part of this specification, Figure 1 is a side elevational view of my improved hand brake mechanism, illustrating the same applied to the end wall of a railway car, the end Wall of the car being shown in vertical section. Figure 2 is a transverse, vertical sectional view, corresponding substantially t0 the line 2--2 of Figure 1, showing the clutch and cam for operating the same in elevation. Figure 3 is a view similar to Figure 2, on an enlarged scale and partly broken away, showing the position that the parts assume when the clutch is in disengaged position. Figure 4 is a detail elevational end view of the clutch member of my improved mechanism, looking from left to right in Figure 3.

In said drawing, referring to Figure 1, l0 and l I designate the inner and outer members of the vertical inner end wall of a railway car. My improved hand brake mechanism is illustrated as mounted on this end wall in such a manner as to be operable from the interior of the car with the hand wheel of the mechanism rotatable in a plane substantially parallel to said end wall. The operative parts of the mechanism are preferably enclosed in ahousing l2, and the wall member II is cut out or recessed to accommodate the same.

In carrying out my invention, I preferably form the housing of two parts, l3 and M, to provide for ready assembling of the brake mechanism.

My improved brake mechanism proper comprises broadly a chain winding drum A; a worm wheel B; arworm element 0; a sliding clutch member D; a clutch spring E; a lever actuated cam means F; and an operating hand wheel G.

Therchain winding drum A is in the form of a hollow casting having a chain winding section l5 at one end and an enlarged section It at the other end adapted to accommodate the'sliding clutch member D. The section I 5 of the drum is of substantially cylindrical, tubular formation and is open at its right hand end, as seen in Figures 2 and 3. The drum is rotatably supported at its right hand end by a hollow bearing projection or boss I! on the vertical wall ll! of the housing and over which the end of the section l5 of the drum is engaged. The opposite or left hand end of the drum is supported by the worm wheel B into which said end extends, the worm wheel having an axial bearing seat or opening [8 to receive said end. The worm wheel B, in turn, is rotatably supported in bearing members l9 and 20 of the housing, being provided with hollow, cylindrical hub portions 2! and 22 at opposite sides thereof engaged in said bearing members, respectively. The section [5 of the drum A is provided with the usual chain anchoring lugs 23 to which the inner end of the brake chain 24 is secured by a pin 25 extending through the lugs and the end link of the chain. The brake chain 24, which is shown broken away in Figure 2, is connected to thebrake mechanism proper of the car, not shown, in the usual well known manner.

The worm C, which meshes with and drives the worm wheel B, is disposed above the, same, being fixedly mounted on a shaft 26 rotatably supported in suitable bearings of the housing l2 and having the hand wheel G fixed to the outer end thereof.

The clutch D, which normally operatively connects the chain winding drum A to the worm wheel B, comprises a head member 21 provided with peripheral clutch teeth 28 engaging interior teeth 29 on the enlarged section l6 of the drum A, and a stem 30 extending from said head. The stem 30 is slidingly engaged in the hollow hub 2| of the worm C and normally projects therefrom as shown in Figure 2. The clutch D is at all times locked to the worm wheel B for rotation in unison therewith, being provided with elongated, peripheral ribs 3|, which engage with correspondingly shaped grooves 32

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