US2000078A

US2000078A - Hand brake

Info

Publication number: US2000078A
Application number: US690521A
Authority: US
Inventors: Stacy B Haseltine
Original assignee: W H MINER Inc
Current assignee: W H MINER Inc
Priority date: 1930-08-01
Filing date: 1933-09-22
Publication date: 1935-05-07
Anticipated expiration: 1952-05-07

Description

May 7, 71935- s. B. HASELTINE 2,000,078

HAND BRAKE I OrigiQ/nal Filed Augjl, 1930 Il f/F /llll/Illl,

L/ @Mig Patented May 7, 1935 AUNITED STATES kHAND BRAKE VStacy B. Haseltine, Chicago, Ill., assignor to H. Miner, Inc., Chicago, Ill., a corporation of Delaware Original application'August 1, 1930, Serial No.

Patent No. 1,931,655, dated October Divided and this application September 22, V1933, Serial No. 690,521

4 Claims.

This invention relates to improvements in hand brakes.

rThis application is a division of my application, Serial No. 472,218, led August l, 1930, on which i Patent No. 1,931,655, dated October 24, 1933, has

been granted. Y

, One object of theinvention is to provide, in a hand brake mechanism including a chain-winding drum, simple kand efficient meansfor arresting the unwinding movement of the chain-winding drum in a predetermined position when the brakes are released.

Another object of the invention is to provide, in a brake mechanism of the character indicated in the preceding paragraph, means for positively stoppingl the unwinding movement of the chain-winding drum when the brakes are released and so positioning the pivot connection of the chain with the drum that quick take-up of the slack in the brake chain is veffected immediately when the drum is rotated inA chain-winding direction.

A still further object of the invention is to provide stop means of the character described in the preceding paragraph, which is especially designed for operation in connection with a chainwinding drum having more than one turnof the chain wound thereon in the chain-tightening operation.

Yet another object of the invention is to provide a stop means which effectively stops the rotation of the drumof a hand brake mechanism when the brakes are quickly released so as to prevent reverse winding. of the chain thereon, which might otherwise occur due to the momentum of the rotation of the drum.

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

In the drawing, forming a part of this specication, Figure 1 is a vertical sectional view of a hand brake mechanism, illustrating myimprovements in connection therewith. Figure 2 is a vertical sectional View, on an enlarged scale, corresponding substantially to the'line 2-2 of Figure l, said view being partly broken away.

In said drawing the hand brake mechanism is shown as mounted on the vertical end wall III of a railway car and is enclosed within a two-part housing comprising sections I2 and I3. The section I2 forms the cover plate of the housing and the section I3 the housing proper. The section I3 is provided with securing lugs I4-I4 by which the same is fixed to the end wall of the car. The housing section I3 is divided into two compart- Ycable therewith and is yieldingly held in its ex- (Ci. zar-149) ments by a vertically disposed partitionwall I1 at right angles to the plane of the end ofthe car. At the right-hand end, as viewedv in Figure k1', the housing hasa side wall 20, which is provided with an outwardly projecting closed boss 2l'. At the inner end, the boss2l is provided with a bearing opening22 which receives and forms a journal member for the inner end of a shaft 23 on which thechain-winding drum A Vis mounted. The `opposite end of the' shaft 23 has a cylindrical portion24,.which is journaled in a bearing opening 25' provided in the partition wall Il. At the extremity ofthe shaft 23 to the left of the partition wall I1, as viewed in Figure l, the same is provided with a clutch member F, which is formed integral therewith. The clutch member F is providedwith a plurality of recesses 251-26 whichl cooperate with a clutch member E. To,the left of the clutch member F, the shaft 23 is provided with a cylindrical bearing portion 2l, on which a worm wheel B is rotatably journaled. The wormv wheel B meshesY with a driving worm member C rotated by the operating hand wheel, ynot Shown. The clutch member E is rotatable about the axis of the shaft 23 and is secured to an operating rod 28 extending through'the shaft 23 andvprojecting'beyond theright-hand end of the same, as viewed in Figure 1, said projecting portion being disposed within the hollowboss 2 I. The project- Y ing portion last Vreferred to'has a spring cap 29 d xed thereto, within which a clutch spring H is housed. The inner end Vof the clutch spring- H' bears directly on the extremityV of the shaft 23, thereby pullingthe rod 28 to the right, as viewed in Figure l. At the outer end, that is, the lefthand end of the rod as viewed in Figure l, the same is provided with an enlarged portion 30,

` which extends through an opening 3l in the cover member of the housing. The inner end of the enlarged portion 3) of the rod is engaged within the clutch member E and is secured thereto by a transverse locking pin or rivet 32. As will be evident, the clutch member E is thus secured to the clutch operating rod 28 so as tobe reciprotreme right-hand position, as Viewed in Figure l, 4 by the clutch, spring H. The clutch member E has a pair of diametrically arranged, laterally projecting, clutch ngers or arms 5I'-6I, which are slidable within openingsrB2-62 provided in the worm wheel B and are engageable with the recesses 26-26 of the clutch memberF. An operating lever G is pivotally connected at the inner end to. a'collar or ring 33 which surrounds the outer end of the rod 28, the rod being headed, 55

modate the brake chain 35, which is connected to the brake mechanism proper, not shown, of the n car in the usual manner.

My improvements, comprise broadly a stop member K on the chain-Winding drum and a co1 operating stop shoulder on the housing of the brake mechanism.

In carrying out my improvements, the innerl end-of the brake chain 35 is connected to 'outstanding securing lugs formed on the chainwind ing drum, by means of a connecting pin 36 extending through said lugs and the innermost link of the chain 35, as shown in Figure 2. 'Ihe chain'- Winding drum has the stop member K pivoted thereto, the latter being swingingly supported on the pin 36. The stop member K is provided Y with a stop face 37 at the right-hand side the-reof, as viewed in Figure 2, which cooperates with a transverse stop shoulder 38 formed by the wall section 39 of the housing. VThe stop member K is of such a size that when it is swunginwardly against the chain-winding drum it will clear the wall 39 of the-housing so that the Winding drum may be rotated inl chain-Winding directionwithout interference. When the chain-winding drum is rotated in an unwinding direction, that is, in

a contra'clockwise direction, as viewed in Figure 2,

w; ing drum and preventing rewinding of the chain v*thereon due to spinning of the same.

The stop K Vis held in position against the drum by the chaink being Wound over the stop, thereby preventing contact with the shoulder 38 until after the chain has been completely unwound, thus permitting the necessary number of rotations of the drum to completely unwind the chain.

Y In the operation of my improved `hand brake mechanism, in applying the `brakes the worm. C is rotated to actuate the Worm Wheel B while the clutch fingers or arms of the clutch member E areheld in interlocking relation with the notches of the clutch member F by means of the clutch spring H, thereby causing the chain- Winding drum to be rotated when the hand Wheel is actuated. To effect quick release of the brakes,

the cam lever G is pulled outwardly, thereby pulling the rod 28 to the left, as Viewed in Figure l, against the tension of the spring H, and carrying Vpointed out, in releasing the brakes rotation of the drum is positively arrested and rewinding of the chain on the chain-winding drum is prevented bythe stop member K engaging the stop shoulder 38 o n the housing.

I have herein shown and described what I now consider the preferred manner of carrying out my invention, but the same is merely illustrative and I contemplate all changes and modications that come within the scope of the claims appended hereto.

I claim:

1. In a hand brake mechanism, the combination with a chain-Winding drum; of a brake chain connected to the drum; .operating means vforrotating the drum; a' gravity-influenced swinging stop member connected to the drum; and stop shoulder means cooperating with said stop member to stop rotation of the drum when the brakes are completely released.

2. In a hand brake mechanism, the combinaconnected to the drum; operating means for rotating the drum; a gravity-inuenced, pivoted stop member hung on the drum; and a housing enclosing said brake mechanism, said housing having ashoulder thereon cooperating with' said stop member to stop rotation of the drum when the brakes are completely released.

3. In a hand brake mechanism, the combination with a support; of a chain-Winding drum rotatably mounted on said support; a pivoted stop member on the drum; a chain windable on the drum; anda xed stop shoulder on said'support engageable by said stop member for arresting.

rotation of the drum when the brakes are completely released, said chain when wound on the drumv swinging the stop member Yagainst the drum to clear said xed stop shoulder.

4. The combination with a ydrum and a cable therefor, of mechanism for preventing reverse winding of the cable on the drum, comprising a bracket carrying the mechanism, and a gravity actuated, pivoted latch lever and detent means carried by the bracket and the drum, .the lever being so located that it will be held in an inactive position until the last convolution of cable is unwound from the drum.

. 4 STACY B.V HASELTINE.