Patent US3842948A successfully refreshed from Google Patents.
US3842948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc brakes
Assignee: Girling Ltd
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Filing: 1972-12-04
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Granted: 1974-10-22
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Expires: 1992-12-04
Abstract
Abstract In a disc brake of the kind in which rotatable friction discs are brought into engagement with opposed surfaces in a stationary housing by axial separation of co-operating pressure plates located between the friction discs, balls being housed in complementary inclined recesses in the adjacent faces of the pressure plates, and on application of the brake the pressure plates move angularly with the friction discs until one plate is arrested by a stop, the other plate continuing to move angularly to produce a servo action, a non-rotating intermediate disc located between rotatable friction discs on at least one side of the pressure plates is permitted a limited angular movement and is arranged to transmit to the servo pressure plate the torque taken by the intermediate disc when the brake is applied.
Inventors
- 👤 R Fredrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:28
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/02; F16D55/04; F16D55/14; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
225 words
A disc brake of the kind in which friction Discs rotatable in both directions are brought into engagement with opposed surfaces in a stationary housing by axial separation of co-operating pressure plates located between the friction discs and maintained in parallelism in the off position of the brake, balls being housed in complementary inclined recesses in the adjacent faces of the pressure plates, and on application of the brake the pressure plates move angularly with the friction discs until one plate is arrested by a stop, the other plate continuing to move angularly to produce a servo action, at least two rotatable friction discs on each side of said pressure plates and at least one intermediate disc location between adjacent friction discs on each side of said pressure plates, means affording an operative connection between all of said intermediate discs selectively to each of said pressure plates depending on the direction of rotation of the friction discs, said means being constructed and arranged that all of said intermediate discs on both sides of said pressure plates transmit torque in both directions of rotation of the friction discs to whichever pressure plate is acting as the servo plate while allowing relative rotational movement between said intermediate discs and whichever pressure plate is arrested by its stop according to the direction of rotation of the friction discs.
Claim 2
Dependent Claim
225 words
A disc brake of the kind in which friction Discs rotatable in both directions are brought into engagement with opposed surfaces in a stationary housing by axial separation of co-operating pressure plates located between the friction discs and maintained in parallelism in the off position of the brake, balls being housed in complementary inclined recesses in the adjacent faces of the pressure plates, and on application of the brake the pressure plates move angularly with the friction discs until one plate is arrested by a stop, the other plate continuing to move angularly to produce a servo action, at least two rotatable friction discs on each side of said pressure plates and at least one intermediate disc location between adjacent friction discs on each side of said pressure plates, means affording an operative connection between all of said intermediate discs selectively to each of said pressure plates depending on the direction of rotation of the friction discs, said means being constructed and arranged that all of said intermediate discs on both sides of said pressure plates transmit torque in both directions of rotation of the friction discs to whichever pressure plate is acting as the servo plate while allowing relative rotational movement between said intermediate discs and whichever pressure plate is arrested by its stop according to the direction of rotation of the friction discs.
Claim 3
Dependent Claim
65 words
A disc brake as in claim 1 including a pin mounted for limited movement in a circumferential direction in said brake housing and co-operating with opposed lugs on the pressure plates and with a radially projecting part of each of said intermediate discs whereby on application of the brake torque taken by the intermediate discs is transmitted through said pin to the servo pressure plate.
Claim 4
Dependent Claim
58 words
A disc brake as in claim 1 wherein said stop for the pressure plates comprises a pin fixed in the brake housing, and wherein said operative connection comprises radially projecting lugs on the intermediate discs, and complementary lugs on the pressure plates cooperating with said lugs for transmitting torque from the intermediate discs to the servo pressure plate.
Claim 5
Dependent Claim
40 words
A disc brake as in claim 1 wherein said operative connection comprises radially projecting lugs on said intermediate discs located between radially projecting lugs on the pressure plates for transmitting torque from the intermediate discs to the servo pressure plate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |