Patent US3850268A successfully refreshed from Google Patents.
US3850268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-locking disc brake mechanism
Assignee: Peugeot & Renault
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Filing: 1973-07-10
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Granted: 1974-11-26
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Expires: 1993-07-10
Abstract
Abstract In the illustrative embodiments disclosed, a self-locking disc brake mechanism of a construction particularly suited for use as a vehicle parking brake includes a pair of operatively interconnected brake shoes, one of which is mounted on either side of the brake disc. Upon actuation of the brake, the shoes are moved to mutually opposed braking positions in contact with the sides of the disc. One of the shoes is further adapted for limited lateral movement, in response to rotation of the disc while the shoe is in the braking position, in the direction of rotation of the disc. A pivotal cam member coacts with a cam surface on the laterally movable shoe to urge the shoe still more forcibly against the disc upon the occurrence of such lateral movement. By virtue of the interconnection between the shoes, this also produces a greater braking force on the other shoe, with the result that the disc tends to be locked between the shoes against further rotation.
Inventors
- 👤 M Guettier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:31
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D55/225; F16D55/226; F16D65/00; F16D65/14; F16D65/16; F16D65/18; F16D65/38; F16D65/40; F16D65/52; F16D2055/0004; F16D2055/0016; F16D2055/0025; F16D2121/00; F16D2121/14; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/22; F16D2125/28; F16D2125/32; F16D2125/58; F16D2125/60; F16D2127/00; F16D2127/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
241 words
A self-energizing brake mechanism for braking a rotatable disc, comprising a floaTing supporting member freely movable in a direction perpendicular to said disc only, a lever arm rotatably mounted on said supporting member, a first cam rotatably mounted on said supporting member, connecting means for locking said first cam to said lever arm in an adjusted angular relation, a first braking element slidingly mounted on said supporting member for movement perpendicular to said disc only and including resilient means for biasing it away from said disc, the surface of first braking element opposite to said disc being engagable with said first cam so as to be brought into engagement with a face of said disc when said first lever arm is operated, a second braking element mounted on said supporting member on the opposite face of said disc for limited movement tangentially of said disc, and for movement perpendicular to the disc, said second braking element having in its face opposite to said disc a flat bottom recess and including resilient means for biasing it to a position substantially midway of said limited movement, and a second cam rotatably mounted on said supporting member on an axis located in a diametral plane of said disc, said second cam having a cam surface engaging the flat bottom of said recess, said cam surface having a generally curved configuration of a radius greater than the perpendicular distance between said axis and said bottom.
Claim 2
Dependent Claim
241 words
A self-energizing brake mechanism for braking a rotatable disc, comprising a floaTing supporting member freely movable in a direction perpendicular to said disc only, a lever arm rotatably mounted on said supporting member, a first cam rotatably mounted on said supporting member, connecting means for locking said first cam to said lever arm in an adjusted angular relation, a first braking element slidingly mounted on said supporting member for movement perpendicular to said disc only and including resilient means for biasing it away from said disc, the surface of first braking element opposite to said disc being engagable with said first cam so as to be brought into engagement with a face of said disc when said first lever arm is operated, a second braking element mounted on said supporting member on the opposite face of said disc for limited movement tangentially of said disc, and for movement perpendicular to the disc, said second braking element having in its face opposite to said disc a flat bottom recess and including resilient means for biasing it to a position substantially midway of said limited movement, and a second cam rotatably mounted on said supporting member on an axis located in a diametral plane of said disc, said second cam having a cam surface engaging the flat bottom of said recess, said cam surface having a generally curved configuration of a radius greater than the perpendicular distance between said axis and said bottom.
Claim 3
Dependent Claim
66 words
The self-energizing brake mechanism according to claim 1, wherein said connecting means for locking said first cam to said lever arm comprises a pawl member pivotally mounted on said lever arm adjacent said first cam and a plurality of ratchet teeth integral with said first cam and selectively engagable with said pawl to lock said first cam with said lever arm in an adjusted angular relation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |