US3822003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic brake adjustment mechanism
Assignee: Boeing North American Inc
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Filing: 1973-02-22
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Granted: 1974-07-02
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Expires: 1993-02-22
Abstract
Abstract A wedge actuated brake assembly including a self-adjusting brake actuating mechanism. A ratchet member on the mechanism cooperates with a pawl mounted in a bore in the brake actuator housing to control mechanism movement. The pawl is part of an assembly that extends into the actuator housing and includes the pawl member itself in toothed engagement with the ratchet member, spring means urging the pawl into engagement with the ratchet member and closure means sealing the housing bore in which the pawl assembly is located and acting as a reaction member for the spring. The pawl, spring means and closure means permanently are joined together as a unitary subassembly.
Inventors
- 👤 J Prange
- 👤 W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:55
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/22; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/561; F16D65/562; F16D2125/00; F16D2125/18; F16D2125/58; F16D2125/66; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2133; Y10T74/2141
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
In a wedge actuated brake assembly having a movable brake shoe adapted to engage a surrounding brake drum, a self-adjusting brake actuating mechanism comprising a housing having a first opening therein, a plunger assembly guided for rectilinear movement in said first opening and adapted when urged out of said first opening to force said shoe toward said drum, said plunger assembly being automatically axially expansible to accommodate wear of the lining of the brake shoe, said plunger assembly including a ratchet member having teeth formed thereon and being slidably and rotatably received in said first opening, a pawl assembly extending into a second opening formed in said housing and communicating with said first opening, said pawl assembly including a pawl member in toothed engagement with said ratchet member, spring means urging said pawl into engagement with said ratchet member and closure means sealing the end of said second opening remote from said First opening, said pawl, spring means and closure means being joined together as a subassembly removable from said second opening as a unit.
Claim 2
Dependent Claim
175 words
In a wedge actuated brake assembly having a movable brake shoe adapted to engage a surrounding brake drum, a self-adjusting brake actuating mechanism comprising a housing having a first opening therein, a plunger assembly guided for rectilinear movement in said first opening and adapted when urged out of said first opening to force said shoe toward said drum, said plunger assembly being automatically axially expansible to accommodate wear of the lining of the brake shoe, said plunger assembly including a ratchet member having teeth formed thereon and being slidably and rotatably received in said first opening, a pawl assembly extending into a second opening formed in said housing and communicating with said first opening, said pawl assembly including a pawl member in toothed engagement with said ratchet member, spring means urging said pawl into engagement with said ratchet member and closure means sealing the end of said second opening remote from said First opening, said pawl, spring means and closure means being joined together as a subassembly removable from said second opening as a unit.
Claim 3
Dependent Claim
29 words
In a wedge actuated brake assembly according to claim 1 wherein at least a portion of said second opening is threaded and is threadedly engaged by said closure member.
Claim 4
Dependent Claim
66 words
In a wedge actuated brake assembly according to claim 1 wherein the end of said pawl member remote from said ratchet member has a counterbore formed therein and the end of said closure member proximate said pawl member has a counterbore formed therein, said spring means comprising a coil expansion spring having one of its ends received in an interference fit in one of said bores.
Claim 5
Dependent Claim
175 words
In a wedge actuated brake assembly having a movable brake shoe adapted to engage a surrounding brake drum, a self-adjusting mechanism comprising a housing having a first opening therein, a plunger assembly bearing on said shoe and guided for movement in said first opening to energize said shoe, said plunger assembly including a ratchet member, and pawl means cooperating with said ratchet member to limit movement of said ratchet member, said pawl means being located in part in a second opening formed in said housing and communicating with said first opening and comprising a pawl member in toothed engagement with said ratchet member, a coil spring, and a plug member threadedly engaged in said second opening and projecting in part from said second opening, said pawl member and said plug having bores formed therein, said spring being positioned between said pawl member and said plug with each end of said spring being received in one of said bores in an interference fit to permanently join said pawl member, spring and plug into a unitary assembly.
Claim 6
Dependent Claim
175 words
In a wedge actuated brake assembly having a movable brake shoe adapted to engage a surrounding brake drum, a self-adjusting mechanism comprising a housing having a first opening therein, a plunger assembly bearing on said shoe and guided for movement in said first opening to energize said shoe, said plunger assembly including a ratchet member, and pawl means cooperating with said ratchet member to limit movement of said ratchet member, said pawl means being located in part in a second opening formed in said housing and communicating with said first opening and comprising a pawl member in toothed engagement with said ratchet member, a coil spring, and a plug member threadedly engaged in said second opening and projecting in part from said second opening, said pawl member and said plug having bores formed therein, said spring being positioned between said pawl member and said plug with each end of said spring being received in one of said bores in an interference fit to permanently join said pawl member, spring and plug into a unitary assembly.
References Cited (Backward Citations)
US3068964A
Cited
US3227247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |