US1793253A

US1793253A - Brake

Info

Publication number: US1793253A
Application number: US388348A
Authority: US
Inventors: Roy S Sanford
Original assignee: Bendix Brake Co
Current assignee: Bendix Brake Co
Priority date: 1925-08-01
Filing date: 1929-08-26
Publication date: 1931-02-17
Anticipated expiration: 1948-02-17

Description

Feb. 17, 1931. R. s. SANFORD BRAKE Original Filed Aug. 1. 1925 INVENTOR. 01 '5: San (1 BY I W ATTOR EY.

Patented Feb. 17, 1931 UNITED STATES PATENT OFFICE BOY S. SANFORD,OF SOUTH BEND, INDIANA, ASSIGNOR TO BENDIX BRAKE COMPANY, OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKE Original application filed August 1, 1925, Serial No. 47,452. Divided and this application filed August 26, 1929. Serial No. 388,348. I

This invention relates to brakes and is illustrated as embodied in an internal expandtapers in its web portion to provide for progressive variation in its flexibility, the anchoring of the friction device being effected by a pair of diverging anchor links pivoted to each other and to the band.

The above and other features of the invention, including various novel combinations of parts and desirable particular constructions, will be apparent from the following description of the illustrative embodiment shown in the accompanying drawing, in which:

Figure 1 is a vertical section just inside the wheel through my novel brake;

Figure 2 is a section taken on the line 22 through the novel anchoring link of the brake.

As disclosed inthe figures of the drawing, the friction means preferably includes a double wrapping band 10, the same being arranged between the drum 14- and the backing plate 16, which band is adapted to be ex-' panded to apply the brake by means shown as a double cam 18.

The band 10 is preferably provided with a reinforcing web 20, comparatively heavy at its ends, which web tapers gradually toward its center, as clearly disclosed in Figure 1, thus giving the desired progressive smooth action of the brake. A return spring 22 secured to the ends of the web adjacent the applying means holds the ends of the band against the applying means.

The aforementioned structure is more completely described in my co-pending application No. 47,452. filed August 1, 1925, the instant application being a division thereof. The novelty of' this case is particularly d1- rected to the means for anchoring the friction band irrespective of the direction of drum rotation. that is, with the car movingelther forward or backward. As clearly disclosed in the figures of the drawing, this anchoring means preferably comprises a pair of links 23 and 24, each link comprising two parallel stampings, as disclosed in Figure 2, the four stampings of both links pivoted to the band by a pivot pin 26 preferably at a point in the band intermediate the rigid and most flexible portions thereof, said links diverging therefrom toefi'ect the function hereinafter'described. The parts of each link are provided with slots 28 embracing anchor pins 30 and 31 carried by the backing plate 16. A spring 32 normally holds the band and both sets of links in idle position with the brake off and it will be further seen that said spring 32 serves to hold the links or their equivalent against the anchor pins 30 and 31 during the first stage of-applying the brake,.that is while the ends of the band are being spread apart against the drum. Upon completion of the application of the brake, if the drum is turning clockwise, the link 24 leaves its anchor 30,

, while the torque of the entire band is trans mitted to the other anchor 31 by the link 23, whereas if the drum is turning counterclockwise the link 23 draws away from itsanchorage and the anchor 30 takes the torque of the entire band.

A very competent and effective brake is thus presented, having a two-thirds wrap in one direction of drum rotation and. a onethird wrap in the other. With the brake efdirection of drum rotation, as indicated in Figure 1, there is provided a rigid reinforced servo section of the band which serves to effectively thrust the more flexible portion of the band into drum engagement. The same is true to a lesser extent of the remaining portion of the band with the drum turning inv a counterclockwise direction.

While but one embodiment of the invention has been disclosed and described in detail, it is not my intention to limit the invention thereto but only so far as maybe embraced by the scope of the appended claims.

I claim:

1. A brake comprising, in combination, a drum, a brake band within the drum extending substantially the entire circumference thereof and tapered to be of progressively varying flexibility, and a pair of lost motion links arranged to take the braking torque and offset from the central portion of the band and engaging the same side of the band where the most flexible portion merges into a comparatively nonflexible portion, one of said links being efi'ective when the drum is turning in one direction and the other being eflective when the drum is turning in the other direction. v

2. A brake comprising, in combination, a drum, a brake band within the drum extending substantially the entire circumference of the drum, and a pair of lost motion links arranged to take the braking torque and offset from the central portion of the band and engaging at least one side of the band, said links being pivoted tosaid band by a common pivot ,pin, one of'said links being effective when the drum is turning in one direction and the other being effective when the drum is turning in the other direction.

3. A brake comprising, in combination, a drum, a brake band within the drum extending substantially the entire circumference thereof. a pair of lost motion links arranged to take the braking torque and offset from the central portion of the band and engaging the same side thereof immediately adjacent said central portion, one of said links being effective when the drum is turning in one direction and the other being effective when the drum is turning in the other direction.

4. A brake comprising, in combination, a drum, a brake band within said drum, a pair of lost motion links arranged to take the braking torque, said links being pivoted to a portion of the band offset from the central portion thereof, said links diverging one from another and being alternately efiective, depending upon the direction of drum rotation, to take the braking torque.

5. A brake comprising, in combination, a drum, a brake band within the drum extending substantially the entire circumference thereof, a pair of lost motion links arranged to take the braking torque and offset from the central portion of the band and engaging at least one side of the band, said links being pivoted to said band by a common pivot pin and slotted at their ends to surround a fixed anchor post, one of said links being effective when the drum is turning in one direction and the other being eifective, when the drum is turning in the other direction, to take th braking torque.

In testimony whereof I have hereunto signed my name.

ROY S. SANFORD.