Patent US3838757A successfully refreshed from Google Patents.
US3838757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal shoe-drum brakes
Assignee: Girling Ltd
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Filing: 1973-02-22
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Granted: 1974-10-01
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Expires: 1993-02-22
Abstract
Abstract In an internal shoe-drum brake in which an actuator for separating the shoes is located between the shoes at one end, the other ends of the shoes abut on members slidable in a stationary body and separated by an intermediate component which includes a stop limiting movement of one member towards the other and may include means for automatically adjusting the separation of the members.
Inventors
- 👤 G Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:37
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/22; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/561
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
An internal shoe-drumbrake in which arcuate shoes are mounted on a stationary back plate and an actuator for separating the shoes is located between the shoes at one end and an abutment unit is located between the other ends of the shoes, said abutment unit comprising a body fixed to the stationary back plate, a first normally non-rotatable member slidable in the body for co-operation with one shoe, a second normally non-rotatable member axially slidable in the body for co-operation with the end of the other shoe, and an intermediate component extending between the members and including stops adapted to engage with a part of the body and to limit movement of one member towards the other.
Claim 2
Dependent Claim
117 words
An internal shoe-drumbrake in which arcuate shoes are mounted on a stationary back plate and an actuator for separating the shoes is located between the shoes at one end and an abutment unit is located between the other ends of the shoes, said abutment unit comprising a body fixed to the stationary back plate, a first normally non-rotatable member slidable in the body for co-operation with one shoe, a second normally non-rotatable member axially slidable in the body for co-operation with the end of the other shoe, and an intermediate component extending between the members and including stops adapted to engage with a part of the body and to limit movement of one member towards the other.
Claim 3
Dependent Claim
47 words
An internal shoe-drum brake as in claim 1 wherein said members comprise plungers axially slidable in aligned bores in the body, and the intermediate component comprises a spindle which is in screw-threaded engagement with at least one of the members and is rotatable by automatic adjusting means.
Claim 4
Dependent Claim
65 words
An internal shoe-drum brake as in claim 2 wherein one end of said spindle is in screw-threaded engagement with a blind axial bore in one member and the other end of the spindle is in screw-threaded engagement with a nut slidable but not rotatable in a blind axial bore in the other member, the screw-threads on opposite ends of the spindle being of opposite hands.
Claim 5
Dependent Claim
53 words
An internal shoe-drum brake as in claim 2 wherein one end of said spindle is in screw-threaded engagement with one member and the other end is of non-circular cross-section and is slidably engaged in a bore in a sleeve which is in screw-threaded engagement with a blind axial bore in the other member.
Claim 6
Dependent Claim
78 words
An internal shoe-drum brake as in claim 2 wherein said automatic adjustment means comprises a drive ring which has a reversible screw-threaded engagement with an intermediate part of the spindle and a spring-loaded coned clutching engageMent with a part of the body, excess axial movement of a member in the application of the brake reducing the clutching engagement of the drive ring with the body and allowing said ring to be rotated by axial movement of the spindle.
Claim 7
Dependent Claim
39 words
An internal shoe-drum brake as in claim 1 wherein said members comprise pistons working in aligned bores in the body, the pistons being provided with seals and means being provided for supplying hydraulic fluid under pressure between the pistons.
Claim 8
Dependent Claim
33 words
An internal shoe-drum brake as in claim 1 wherein said stops for the movement of each piston towards the other are formed by opposite ends of an annular internal shoulder in the body.
Claim 9
Dependent Claim
86 words
An internal shoe-drum brake as in claim 1 wherein said intermediate component comprises an assembly including a first headed stud in screw-threaded engagement with a blind bore in one member, a second headed stud in screw-threaded engagement with a blind bore in the other member, an axial extension of the first stud in sliding engagement with an axial bore in the second stud, and an internal shoulder in the body for engagement by the inner ends of the studs to limit inward movement of the members.
Claim 10
Dependent Claim
82 words
An internal shoe drum brake as in claim 8 wherein an automatic adjuster is incorporated, the adjuster being formed by a screw-thread of steep pitch on said extension of the first headed stud and a drive ring working on said thread and in spring-loaded clutching engagement with the secons stud, the clutching engagement being freed by excess axial movement of the second member in the application of the brake whereby the ring is rotated by axial movement of the extension through it.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |