Patent US4053032A successfully refreshed from Google Patents.
US4053032A
Expired / Lapsed
US
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Self-actuating brake linkage
Assignee: Ingersoll Equipment Co Inc
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Filing: 1976-10-15
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Granted: 1977-10-11
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Expires: 1996-10-15
Abstract
Abstract An improved self-actuating linkage for a flexible band-type brake which eliminates binding or locking of the brake. The linkage includes a pair of pivotally supported L-shaped levers connected to the brake band. The levers cross and are pivotally connected to a cam member. The cam member has a pair of angularly related slots extending outwardly from a line through the axis of the drum and slidably receiving the pivotal connections to the levers. The brake is actuated by tensioning the cam member and the brake is released by movement of the cam member toward the brake drum, whereby the levers are spread within the angularly related slots to assure release of the brake band.
Inventors
- 👤 Raymond F. McDonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:31
CPC Classifications
F; F16; F16D; F16D49/00; F16D49/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
211 words
An improved self-actuating brake for vehicles, including a flexible brake band having a center portion for receipt around a rotatable drum, a pair of brake actuating levers, each of said levers having a first pivotal connection to one of said brake band free ends, a fixed pivot adjacent said first pivotal connection and a second pivotal connection to a cam member, said first pivotal connection and said fixed pivot defining the shorter leg of an L-shaped lever with said first and second pivotal connections defining the longer legs, said longer legs of said lever extending away from said brake band and crossing, said cam member located generally between said second pivotal connections of said levers, said cam member having a pair of angularly related slots extending generally away from said brake band and slidably receiving said second pivotal connections of said levers and a brake linkage means pivotally connected to said cam member between said second pivotal connections adapted to tension said cam member, rotating said levers about said fixed pivots to actuate said brake, release of said brake linkage means resulting in movement of said cam plate toward said brake band, whereby said cam plate spreads said lever second pivotal connections within said angularly related slot, releasing said brake band.
Claim 2
Dependent Claim
211 words
An improved self-actuating brake for vehicles, including a flexible brake band having a center portion for receipt around a rotatable drum, a pair of brake actuating levers, each of said levers having a first pivotal connection to one of said brake band free ends, a fixed pivot adjacent said first pivotal connection and a second pivotal connection to a cam member, said first pivotal connection and said fixed pivot defining the shorter leg of an L-shaped lever with said first and second pivotal connections defining the longer legs, said longer legs of said lever extending away from said brake band and crossing, said cam member located generally between said second pivotal connections of said levers, said cam member having a pair of angularly related slots extending generally away from said brake band and slidably receiving said second pivotal connections of said levers and a brake linkage means pivotally connected to said cam member between said second pivotal connections adapted to tension said cam member, rotating said levers about said fixed pivots to actuate said brake, release of said brake linkage means resulting in movement of said cam plate toward said brake band, whereby said cam plate spreads said lever second pivotal connections within said angularly related slot, releasing said brake band.
Claim 3
Dependent Claim
35 words
The selfactuating brake defined in claim 1, characterized in that said levers are pivotally connected to said cam member by pins projecting from said levers received within said angularly related slots in said cam member.
Claim 4
Dependent Claim
42 words
The self-actuating brake defined in claim 1, characterized in that each of said cam member slots extend at an angle of about 20° to a line perpendicular to the diameter of the brake drum when the brake is in a relaxed position.
Claim 5
Dependent Claim
55 words
The self-actuating brake defined in claim 1, characterized in that said levers are L-shaped with said shorter leg being bifurcated and said cam member comprising a plate having said angularly related slots, said bifurcated legs nestingly receiving said cam plate and providing a stop means limiting movement of said cam plate toward said brake band.
Claim 6
Dependent Claim
45 words
The self-actuating brake defined in claim 4, characterized in that said second pivotal connections comprise a pin through said lever received within said cam plate slots, said pins engaging said bifurcated leg of said lever, limiting movement of said levers and providing said stop means.
Claim 7
Dependent Claim
40 words
The self-actuating brake defined in claim 1, characterized in that said levers are identical L-shaped levers pivotally retained to a support plate by said fixed pivot, said support plate adapted to be secured to a vehicle adjacent the brake drum.
Claim 8
Dependent Claim
170 words
A self-actuatig brake for vehicles having a rotatable brake drum, a flexible brake band for receipt around the vehicle brake drum, a pair of generally L-shaped levers each having a bifurcated short leg and a flat long leg, the short leg of each of said levers pivotally supported on a fixed pivot, the long legs of said levers extending away from said brake band, crossing and pivotally connected to a cam member partially nestable within said bifurcated lever legs, each of said levers pivotally connected to one of the free ends of said brake band adjacent the apex of said legs and said cam member having a pair of angularly related slots extending outwardly from a line through the axis of the brake drum slidably receiving the pivotal connections of said levers, whereby the brake may be actuated by tensioning said cam member and the brake band is released by movement of said cam member toward said band, spreading said levers within said angularly related slots of said cam member.
Claim 9
Dependent Claim
170 words
A self-actuatig brake for vehicles having a rotatable brake drum, a flexible brake band for receipt around the vehicle brake drum, a pair of generally L-shaped levers each having a bifurcated short leg and a flat long leg, the short leg of each of said levers pivotally supported on a fixed pivot, the long legs of said levers extending away from said brake band, crossing and pivotally connected to a cam member partially nestable within said bifurcated lever legs, each of said levers pivotally connected to one of the free ends of said brake band adjacent the apex of said legs and said cam member having a pair of angularly related slots extending outwardly from a line through the axis of the brake drum slidably receiving the pivotal connections of said levers, whereby the brake may be actuated by tensioning said cam member and the brake band is released by movement of said cam member toward said band, spreading said levers within said angularly related slots of said cam member.
Claim 10
Dependent Claim
36 words
The self-actuating brake defined in claim 7, characterized in that said levers are pivotally connected to said cam member by pins projecting from said levers and received within said angularly related slots in said cam member.
Claim 11
Dependent Claim
34 words
The self-actuating brake defined in claim 8, characterized in that said pins extend through said levers to engage the bifurcated leg of said levers, limiting movement of said cam member toward said brake band.
Claim 12
Dependent Claim
54 words
The self-actuating brake defined in claim 7, characterized in that said cam member is a plate having said angularly related slots, said slots extending at an angle of less than 90° to a line through the axis of the brake drum and said cam plate nestingly receivable within the bifurcated legs of said levers.
References Cited (Backward Citations)
US3841447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |