Patent US4538582A successfully refreshed from Google Patents.
US3603558A
Expired / Lapsed
US
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Brake proportioning means
Assignee: Bendix Corp
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Filing: 1970-01-09
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Granted: 1971-09-07
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Expires: 1990-01-09
Abstract
Abstract A proportioning means for a dual hydraulic brake system that will regulate the brake pressure in one portion of that system in two steps by utilizing a device responsive to a control pressure for proportioning the brake pressure in steps.
Inventors
- 👤 Maxwell L Cripe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:03
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
A control for a servomotor operated hydraulic system to proportion pressure in a portion of the system in accordance with control pressure for the servomotor, said control comprising: a fluid pressure motor having movable wall means therein subjected to spring means characterized by at least a first movable wall operatively connected to a second movable wall and movable relative thereto with A first spring for said first movable wall and a second spring for said second movable wall of greater force than said first spring, said motor having means to introduce the control pressure to one side of the movable wall means, said movable wall means having a force transmitting rod attached thereto; and a hydraulic cylinder having port means to interpose said cylinder between an actuator and a device to be actuated in one portion of the hydraulic system, said cylinder having means to receive and support said force transmitting rod therein with said rod being operatively connected to valve means for passages through a piston communicating said port means interiorly of said cylinder such that the communication is responsive to the position of said movable wall means and the pressure differential across said valve means.
Claim 2
Dependent Claim
197 words
A control for a servomotor operated hydraulic system to proportion pressure in a portion of the system in accordance with control pressure for the servomotor, said control comprising: a fluid pressure motor having movable wall means therein subjected to spring means characterized by at least a first movable wall operatively connected to a second movable wall and movable relative thereto with A first spring for said first movable wall and a second spring for said second movable wall of greater force than said first spring, said motor having means to introduce the control pressure to one side of the movable wall means, said movable wall means having a force transmitting rod attached thereto; and a hydraulic cylinder having port means to interpose said cylinder between an actuator and a device to be actuated in one portion of the hydraulic system, said cylinder having means to receive and support said force transmitting rod therein with said rod being operatively connected to valve means for passages through a piston communicating said port means interiorly of said cylinder such that the communication is responsive to the position of said movable wall means and the pressure differential across said valve means.
Claim 3
Dependent Claim
62 words
The structure of claim 1 wherein said cylinder is divided into an inlet chamber and a displacement chamber by said piston that are communicated by a central bore through said piston which said rod passes to provide said passages therebetween with said piston terminating in a valve seat face in said displacement chamber for a poppet valve attached to said rod therein.
Claim 4
Dependent Claim
34 words
The structure of claim 2 wherein said poppet valve is provided with a boss forming a stop means with an end wall of said cylinder for the rest position of said movable wall means.
Claim 5
Dependent Claim
49 words
The structure of claim 2 wherein said first movable wall has a tubular boss slidably supporting said second movable wall and communicating reference pressure to chambers containing said spring means on opposite sides of the movable wall means than the one side on which the control pressure is introduced.
Claim 6
Dependent Claim
29 words
The structure of claim 4 wherein the control pressure for said first movable wall is routed by passages in a housing for the motor to the second movable wall.
References Cited (Backward Citations)
US2592885A
Cited
US3461913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |