US1697869A - Brake band - Google Patents

Description

Jan. 8, 1929.

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:ATTORNEY g d/ 'aYww Patented Jan. 8, 1929 HARRY B HILLS, OF LOS 'ANGELES, CALIFORNIA;

BRAKE BAND.

Application filed December 6, 1926. Serial No. 152,782.

My invention relates to brake bands, which are generally used in connection with a rotating drum to which a load is applied, for the purpose of restraining or stopping the rol tation of the drum and thereby the movement of the load. The object of the invention is to provide a tri-member band so acting as to have a snubbing action on the drum, in combination with means whereby the release of the brake band may be quickened and the releasing movement of one member of the band may be directly communicated to an adjacent member. Other objects willhereinafter appear. In the accompanying drawings- Fig. 1, is a view partly in vertical section and side elevation of a rotating drum to which a load is applied, and a brake band embodying my invention.

Fig. 2, is an end elevation partly in vertical section of the device shown in Fig. 1.

Figs. 3 and 4 are detail views of portions of the brake band shown in Figs. 1 and 2.

Fig. 5 is an end elevation showing a modified form of brake band and embodying my invention.

Similar reference characters designate corresponding parts in all of the figures.

1 designates a rotating brake drum, which may form a part of any type of mechanism to which a load is attached or connected. For example it may be comprised in a Windlass or any other type of hoisting and lowering mechanisms, or it may be comprised in a vehicle which is to be stopped by means of a brake band. In the drawings the drum is shown as being mounted on roller or other anti-friction hearings in standards 2, only one of which is shown, and as being rotated in the direction of the arrow w under the influence of a load. In this direction the rotation of the drum is controlled by the brake band. The opposite direction of rotation of the drum is shown as being secured through the shaft 3 to which the drum is secured. The end 4 of the shaft 3 is squared to receive a crank. In this direction of rotation the shaft rotates free of the brake band.

My improved brake-band consists of a strap of metal which is wound around the braking surface of the brake drum. One end of the strap is fixed, while the other end is moved under control to regulate the frictional engagement of the convolutions of the strap with the braking surface of the drum.

The brake band, shown in Figs. 1 to 4 comprises a single strap 5 which extends around the drum for nearly its entire circumference 1 and two other straps 5b, 5 which also extend around the drum for nearly its entire circuml0 ference'and outside of the single strap 5 as shown in Fig 2. The adjacent ends of the single strap 5 and straps 5", 5 are connected or coupled together by a suitable coupling or connection as shown in Fig. 3. Any desired form of coupling or connection may be used. As here shown it comprises aplate 6 riveted to the single strap 5 and a plate 6 riveted to the two straps 5*, 5. Both plates 6*, 6 have a flange 6 through which a bolt 6 passes. The other end of the single strap 5' has riveted to it a plate 7 which is fastened to 'a cross piece 7 comprised in the frame work, While the other ends of the straps 5*, 5 have riveted to them a plate 7 b (Fig. 4) secured to'a crank arm 8 (see Figs. 1 and 2) fixed upon a shaft 9, suitably journaled in boxes-10 which are shown as being bolted to the cross-piece 7. One end of a controlling lever 11 is also fixed to the shaft 9, the other end of which is provided with a handle 11. A weightlQ is also pro vided on the lever 11 the function of which is to normally hold the brake band onto the drum to prevent it from rotating. This pressure may be increased beyond that offered by I the weight by depressing the lever 11. The brake band is released from the drum so asto leave it free to rotate'by raising the lever 11.

If desired, in the form shown in Figs. 1 to 4 the releasing of the brake'band may be quickened by any desired means which act upon the lifting of the lever to release the straps 5 5 and subsequently and in turn the single strap 5 Ashere shown these means compris'e'a rod 15 connected at one end with the crank arm 8, and engaging the plate 6 with its other end. When lever 11 is raised crank arm 8 is swung to theleft from its position in Fig. 1,

the straps 5 5 are moved in releasing or slack position, the actuation beginning at the outer ends thereof. Simultaneously therewith rod 15 acts to release the intermediate portion of the brake band viz, at that point where the inner ends of straps 5 5 join strap 5 and to further insurequick and uniform releasing action the inner strap 5 carries clips 5 overhanging the outer strapso 5 and compelling the latter to impart their releasing movements to the former., Also the outer straps carry clips 5 overhanging the inner strap so that releasing movements of the latter are communicated to the former.

In order that the releasing movement of plate 7" will not bow the straps 5 5 at the ends thereof but will distribute the slackness about the circumference of the brake drum, I form the plate with projecting legs 5 each secured to one of the said spaced straps, serving to reinforce and so stiffen them that the difliculty is obviated.

r In Fig. 5 the brake band is shown as being a single strap 20, wound about the braking surface of the drum, one end 20 ofthe strap is' secured to the frame-work as is the single strap 5 in Fig. 1, and the other end 20" is se cured to a crank arm as are the two straps 5 5inFig. 1, for the same purpose.

It will be observed that the form of brake band shown in Fig. l is, structurally, the 7 Having described my invention, what I claim and desire to secure by Letters Patent is as follows In brake mechanism, a brake drum, a brake band on said drum and being of a length to wrap around the same a plurality of times, said band comprising two spaced straps and coact and transmit the releasing movements of any one of the straps to the other straps.

In testimony whereof I have signed my I name to this specification.

HARRY B. HILLS.

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