Patent US3653722A successfully refreshed from Google Patents.
US3653722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Front brake valve
Assignee: Berg Manufacturing and Sales Co
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Filing: 1970-07-27
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Granted: 1972-04-04
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Expires: 1990-07-27
Abstract
Abstract A valve assembly for varying brake pressures applied to front vehicle wheels including a differential piston, a second piston effective against said differential piston and positive exhaust closing means.
Inventors
- 👤 Boleslaw Klimek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:19
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
A valve including a housing, an inlet, an outlet, a differential piston reciprocal in said housing between said inlet and said outlet, said piston having a smaller surface presented to said inlet and a larger surface presented to said outlet, a passage through said piston communicating said inlet and outlet, a valve element positioned to control said passage, yielding means urging said differential piston toward passage-open position, and a second piston, said second piston having a surface presented to said inlet and larger than either surface of said differential piston, said second piston having a portion engageable with said differential piston to urge said differential piston toward said passage-open position to response to delivery of fluid pressure at said inlet above a predetermined level, an exhaust outlet in said housing, a valve positioned to close said exhaust outlet, and an extension carried by said differential piston and positioned for operating contact with said exhaust valve to urge the same into exhaust outlet closing position in response to said yielding means.
Claim 2
Dependent Claim
170 words
A valve including a housing, an inlet, an outlet, a differential piston reciprocal in said housing between said inlet and said outlet, said piston having a smaller surface presented to said inlet and a larger surface presented to said outlet, a passage through said piston communicating said inlet and outlet, a valve element positioned to control said passage, yielding means urging said differential piston toward passage-open position, and a second piston, said second piston having a surface presented to said inlet and larger than either surface of said differential piston, said second piston having a portion engageable with said differential piston to urge said differential piston toward said passage-open position to response to delivery of fluid pressure at said inlet above a predetermined level, an exhaust outlet in said housing, a valve positioned to close said exhaust outlet, and an extension carried by said differential piston and positioned for operating contact with said exhaust valve to urge the same into exhaust outlet closing position in response to said yielding means.
Claim 3
Dependent Claim
30 words
The structure of claim 1 wherein said valve element and said exhaust valve element are joined for unitary movement and freely carried by said differential piston in floating relationship therewith.
Claim 4
Dependent Claim
25 words
The structure of claim 2 characterized by and including circumferentially spaced guide vanes carried by said differential piston and engaging and centering said valve element.
Claim 5
Dependent Claim
30 words
The structure of claim 1 wherein said exhaust valve, when seated, serves as a limit stop abutment in the excursion of said differential piston in response to said yielding means.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |