US3707210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel brake cylinder assembly for a hydraulic twin brake system
Assignee: Aisin Corp
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Filing: 1970-10-27
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Granted: 1972-12-26
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Expires: 1990-10-27
Abstract
Abstract A wheel cylinder in a braking system is provided with first and second pistons slidable therein and protruding from opposite ends to actuate the brake elements. An intermediate piston is slidably disposed in the cylinder between the first and second pistons to define first and second fluid pressure chambers disposed in communication with a high pressure system and low pressure system respectively. A third pressure chamber is formed between the intermediate piston and the first piston. A valve in the intermediate piston provides communication between the third pressure chamber and one of the first and second pressure chambers and is normally open when both pressure systems are operative. Upon failure of the high pressure system movement of the intermediate piston in the opposite direction by the low pressure system will close the valve thereby trapping the fluid therein to provide a fluid link between the intermediate piston and the first piston to prevent an increase in stroke when the low pressure system takes over.
Inventors
- 👤 Mizuo Nyunoya
- 👤 Masatada Yokoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:34
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/22; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D65/18; F16D2121/00; F16D2121/02; F16D2123/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
A wheel cylinder assembly for a braking system having braking means comprising a hollow cylinder, first and second piston means located in said cylinder for actuating said braking means, intermediate piston means slidably mounted in said cylinder between said first and second pistons and defining first and second fluid pressure chambers therebetween respectively, means for supplying a high and low fluid pressure to said first and second chambers respectively, said first piston means and said intermediate piston means further defining a third fluid pressure chamber therebetween, valve means in said intermediate piston means normally providing communication between one of said first and second chambers and said third chamber when said high and low fluid pressures are simultaneously applied to said first and second chambers, valve operator means operatively connected to one of said first and second piston means whereby said valve means is closable upon relative movement between said one of said first and second piston means and said intermediate piston upon failure of said high pressure to trap the fluid in said third chamber and provide a fluid link between said first piston means and said intermediate piston means.
Claim 2
Dependent Claim
190 words
A wheel cylinder assembly for a braking system having braking means comprising a hollow cylinder, first and second piston means located in said cylinder for actuating said braking means, intermediate piston means slidably mounted in said cylinder between said first and second pistons and defining first and second fluid pressure chambers therebetween respectively, means for supplying a high and low fluid pressure to said first and second chambers respectively, said first piston means and said intermediate piston means further defining a third fluid pressure chamber therebetween, valve means in said intermediate piston means normally providing communication between one of said first and second chambers and said third chamber when said high and low fluid pressures are simultaneously applied to said first and second chambers, valve operator means operatively connected to one of said first and second piston means whereby said valve means is closable upon relative movement between said one of said first and second piston means and said intermediate piston upon failure of said high pressure to trap the fluid in said third chamber and provide a fluid link between said first piston means and said intermediate piston means.
Claim 3
Dependent Claim
22 words
A wheel cylinder assembly as set forth in claim 1 wherein said first and secondpiston means are slidably mounted in said cylinder.
Claim 4
Dependent Claim
31 words
A wheel cylinder assembly as set forth in claim 1 wherein said first piston means is integral with said cylinder and said second piston means is slidably mounted in said cylinder.
Claim 5
Dependent Claim
22 words
A wheel cylinder assembly as set forth in claim 1 wherein said valve means is disposed between said first and third chambers.
Claim 6
Dependent Claim
22 words
A wheel cylinder assembly as set forth in claim 1 wherein said valve means is disposed between said second and third chambers.
Claim 7
Dependent Claim
20 words
A wheel cylinder assembly as set forth in claim 5 wherein said intermediate piston means is comprised of two parts.
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |