Patent US3871493A successfully refreshed from Google Patents.
US3871493A
Expired / Lapsed
US
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Shoe drum brakes
Assignee: Girling Ltd
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Filing: 1973-10-26
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Granted: 1975-03-18
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Expires: 1993-10-26
Abstract
Abstract A vehicle internal shoe drum brake comprises a pair of brake shoes mounted on a brake back plate, and a brake actuator having a lever connected at one end to one of the shoes and being pivotable about a point intermediate its ends. A stop member forms a releasable pivotal connection between a brake applying cable and the other end of the lever and engages an abutment, preferably an extension of the back plate, to hold the lever in a retracted position spaced from a fully retracted position, release of the pivotal connection permitting the shoes to be retracted.
Inventors
- 👤 Christopher Neil Mathias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:10
CPC Classifications
F; F16; F16D; F16D51/00; F16D51/16; F16D51/18; F16D51/20; F16D51/22; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20582; Y10T74/2063
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
In an internal shoe drum brake for a vehicle wheel, comprising a fixed member, a rotatable brake drum, a pair of arcuate brake shoes mounted on the fixed member and having friction linings for engagement with the brake drum, a mechanical actuator comprising an angularly movable lever being pivotable about a point intermediate its ends between a brake applied position and a retracted position wherein the brakes are released and having one end pivotally connected to one of said shoes, and brake applying means pivotally connected to the other end of said lever, the improvement comprising a stop member forming a releasable pivotal connection between said lever and said brake applying means, and an abutment member engaged by said stop member to hold said lever in a first retracted position spaced from a second position of greater retraction.
Claim 2
Dependent Claim
138 words
In an internal shoe drum brake for a vehicle wheel, comprising a fixed member, a rotatable brake drum, a pair of arcuate brake shoes mounted on the fixed member and having friction linings for engagement with the brake drum, a mechanical actuator comprising an angularly movable lever being pivotable about a point intermediate its ends between a brake applied position and a retracted position wherein the brakes are released and having one end pivotally connected to one of said shoes, and brake applying means pivotally connected to the other end of said lever, the improvement comprising a stop member forming a releasable pivotal connection between said lever and said brake applying means, and an abutment member engaged by said stop member to hold said lever in a first retracted position spaced from a second position of greater retraction.
Claim 3
Dependent Claim
31 words
A brake according to claim 1, wherein said stop member is connected directly to said brake applying means and is releasably pivotally, connected directly to said other end of said lever.
Claim 4
Dependent Claim
28 words
A brake according to claim 1, wherein one end of said stop member is rounded and abuts said abutment member to permit angular movement of the stop member.
Claim 5
Dependent Claim
45 words
A brake according to claim 1, wherein one end of said stop member engages said abutment meMber and the other end is connected directly to said brake applying means, and wherein said lever is connected to said stop member intermediate the ends of the latter.
Claim 6
Dependent Claim
17 words
A brake according to claim 1, wherein said abutment member is an extension of said fixed member.
Claim 7
Dependent Claim
37 words
A brake according to claim 1, further comprising a movable strut acting on the other of said brake shoes wherein said lever is pivotally connected to said strut at said point intermediate the ends of said lever.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |