Patent US4079761A successfully refreshed from Google Patents.
Patent US3845932A successfully refreshed from Google Patents.
US3845932A
Expired / Lapsed
US
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Valve-brake
Assignee: NEW PRODUCTS DEVELOPMENT GROUP Inc
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Filing: 1973-03-30
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Granted: 1974-11-05
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Expires: 1993-03-30
Abstract
Abstract A fluid operated valve for pressurizing fluid as well as opening and closing a valve orifice so that the valve can be used in an automatic brake for vehicles to apply the brakes when a predetermined condition occurs.
Inventors
- 👤 J Fontaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:24
CPC Classifications
B; B60; B60T; B60T7/00; B60T7/12; B60T7/16; F; F16; F16K; F16K31/00; F16K31/12; F16K31/14; F16K31/143
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
In a valve comprising, a housing for containing fluid, a valve seat in the housing, a valve stem in the housing movable to engage and disengage from the valve seat, a chamber in said housing, a piston in said chamber for operating the valve stem by a change of fluid pressure acting on the piston, and a connector connecting the piston to the valve stem in a manner allowing relative movement between the connector and the valve stem, the improvement wherein: said connector and said piston have a hollow space therein capable of containing hydraulic fluid and a passage extending through said connector and said piston communicating between said space and said chamber, plug means removably closing said passage at said piston for permitting escape of air to said chamber upon filling of said hollow space with hydraulic fluid and for sealing said passage thereafter, a vent opening between a portion of said chamber and the atmosphere providing access to said plug means, and an inlet leading to another portion of said chamber for applying a change of Fluid pressure to said piston.
Claim 2
Dependent Claim
183 words
In a valve comprising, a housing for containing fluid, a valve seat in the housing, a valve stem in the housing movable to engage and disengage from the valve seat, a chamber in said housing, a piston in said chamber for operating the valve stem by a change of fluid pressure acting on the piston, and a connector connecting the piston to the valve stem in a manner allowing relative movement between the connector and the valve stem, the improvement wherein: said connector and said piston have a hollow space therein capable of containing hydraulic fluid and a passage extending through said connector and said piston communicating between said space and said chamber, plug means removably closing said passage at said piston for permitting escape of air to said chamber upon filling of said hollow space with hydraulic fluid and for sealing said passage thereafter, a vent opening between a portion of said chamber and the atmosphere providing access to said plug means, and an inlet leading to another portion of said chamber for applying a change of Fluid pressure to said piston.
Claim 3
Dependent Claim
27 words
The valve as claimed in claim 1 in which said valve stem has a conical tip with a long, tapered conical surface engageable with said valve seat.
Claim 4
Dependent Claim
20 words
The valve as claimed in claim 2 in which said conical surface has an apex with an acute included angle.
Claim 5
Dependent Claim
39 words
The valve as claimed in claim 1 in which said valve stem has a passage through the same communicating with said hollow space for flow of hydraulic fluid between said hollow space and the outside of said valve stem.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |