US3554333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc brake and multiple actuator therefor
Assignee: Girling Ltd
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Filing: 1968-12-06
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Granted: 1971-01-12
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Expires: 1988-12-06
Abstract
Abstract An hydraulic brake actuator comprising a cylinder containing a pair of pistons having annular skirts which are directed towards one another and are each slidingly sealed on a common sleeve, the sleeve dividing the space enclosed within the cylinder between the two pistons into two separate pressure chambers, having separate inlets for the supply of hydraulic fluid. A disc brake of the sliding yoke type incorporating an hydraulic actuator of the above construction is described in detail.
Inventors
- 👤 Hermannhans Hoenick
- 👤 Heinrich Bernhard Rath
- 👤 Wolfgang Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:44
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D55/225; F16D55/226; F16D55/2262; F16D2055/0004; F16D2055/0016; F16D2055/0025; F16D2055/0041; F16D2055/007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A hydraulic actuator comprising a cylinder, two unitary pistons spaced apart axially of the cylinder and each being sealingly and slidably received in the cylinder, each piston including an integral annular skirt extending axially toward the other piston, a sleeve having its opposite ends sealingly and slidably received within the skirts of the two pistons respectively, said sleeve dividing the space enclosed within the cylinder into first and second fluid pressure chambers, the first chamber being defined by the cylinder, the outer surface of said sleeve and the respective confronting annular faces of said skirts and the second fluid pressure chamber being defined by the interior of said sleeve and the confronting inner faces of said pistons within said skirts, and two separate fluid supply lines communicating respectively with the two fluid pressure chambers.
Claim 2
Dependent Claim
134 words
A hydraulic actuator comprising a cylinder, two unitary pistons spaced apart axially of the cylinder and each being sealingly and slidably received in the cylinder, each piston including an integral annular skirt extending axially toward the other piston, a sleeve having its opposite ends sealingly and slidably received within the skirts of the two pistons respectively, said sleeve dividing the space enclosed within the cylinder into first and second fluid pressure chambers, the first chamber being defined by the cylinder, the outer surface of said sleeve and the respective confronting annular faces of said skirts and the second fluid pressure chamber being defined by the interior of said sleeve and the confronting inner faces of said pistons within said skirts, and two separate fluid supply lines communicating respectively with the two fluid pressure chambers.
Claim 3
Dependent Claim
31 words
An actuator as claimed in claim 1, further comprising pin and slot means acting between said sleeve and said cylinder to restrain axial movement of said sleeve relative to said cylinder.
Claim 4
Dependent Claim
28 words
An actuator as claimed in claim 1, wherein one of said pistons has an end wall penetrated by said pressure fluid inlet for said chamber within said sleeve.
Claim 5
Dependent Claim
134 words
An actuator as claimed in claim 1 in combination with a disc brake structure comprising a slidinG yoke and means mounting said yoke for sliding movement in directions parallel with said cylinder, wherein one of said pistons has a projecting portion extending out of said cylinder, recess means in said projecting portion, and means on said yoke engaging in said recesses to restrain said yoke against movement relative to said one piston in directions perpendicular to said cylinder. 5 The combination of claim 4, wherein said recess means comprise two mutually perpendicular intersecting grooves both extending transversely of said one piston, and said yoke has a portion extending through one of said grooves and a pin fast with said yoke received in the other of said grooves to either side of said yoke portion.
Claim 6
Dependent Claim
48 words
The combination of claim 5, wherein said pin has opposed end portions, and further comprising two bushes of resilient material, one bush mounted on each said end portion, each bush having tight engagement in said other groove and having a flange making tight engagement in said one groove.
References Cited (Backward Citations)
US3414090A
Cited
US3403602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |