Patent US4111391A successfully refreshed from Google Patents.
US4111391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pinch valve
Assignee: Railtech Ltd
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Filing: 1976-11-22
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Granted: 1978-09-05
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Expires: 1996-11-22
Abstract
Abstract A pinch valve includes a distortable rubber-like valve member, in cylindrical form, positioned within a generally cylindrical housing. The valve member has uniformly spaced projections and grooves which enable the valve member to collapse upon itself forming a complete closure between opposite ends thereof. When the valve member so collapses, the circle defined by the outer areas thereof has a greater radius than the radius of the valve member in the uncollapsed condition. The housing has lobular areas to accommodate the extensions of the collapsed valve member.
Inventors
- 👤 Joseph J. Pilolla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:38
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/02; F16K7/04; F16K7/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
262 words
A pinch valve including a housing, a generally cylindrical valve member formed of a flexible distortable rubber-like material attached to and positioned in said housing, said valve member having a plurality of equally spaced, axially extending grooves on the interior surface thereof, said valve member having a plurality of equally spaced axially extending projections on the interior surface thereof, a plurality of equally spaced, axially extending grooves on the exterior of said valve member in peripheral register with said projections, the exterior of said valve member in peripheral register with said interior surface grooves being continuous and unchanged relative to adjacent portions thereof, said projections on the interior surface extending for a portion of the length of said flexible valve member, said grooves on the interior surface extending for a longer portion of the length of said flexible valve member than said interior projections, the application of fluid pressure between said housing and valve member causing the inward collapse of said valve member, with the projections meeting in the center to form a generally complete closure of said valve member, and with the valve member folding upon said interior grooves, said housing having a plurality of outwardly extending lobes smoothly blending with the interior housing surface, there being the same number of lobes as there are interior grooves, the collapse of said valve member causing the outer peripheral fold surfaces to extend into said housing lobes, with the outer peripheral fold surfaces, when so collapsed, circumscribing a circle having a radius greater than that of said valve member in the uncollapsed condition.
Claim 2
Dependent Claim
262 words
A pinch valve including a housing, a generally cylindrical valve member formed of a flexible distortable rubber-like material attached to and positioned in said housing, said valve member having a plurality of equally spaced, axially extending grooves on the interior surface thereof, said valve member having a plurality of equally spaced axially extending projections on the interior surface thereof, a plurality of equally spaced, axially extending grooves on the exterior of said valve member in peripheral register with said projections, the exterior of said valve member in peripheral register with said interior surface grooves being continuous and unchanged relative to adjacent portions thereof, said projections on the interior surface extending for a portion of the length of said flexible valve member, said grooves on the interior surface extending for a longer portion of the length of said flexible valve member than said interior projections, the application of fluid pressure between said housing and valve member causing the inward collapse of said valve member, with the projections meeting in the center to form a generally complete closure of said valve member, and with the valve member folding upon said interior grooves, said housing having a plurality of outwardly extending lobes smoothly blending with the interior housing surface, there being the same number of lobes as there are interior grooves, the collapse of said valve member causing the outer peripheral fold surfaces to extend into said housing lobes, with the outer peripheral fold surfaces, when so collapsed, circumscribing a circle having a radius greater than that of said valve member in the uncollapsed condition.
Claim 3
Dependent Claim
34 words
The structure of claim 1 further characterized in that there are three interior grooves, three exterior grooves, and three inwardly extending projections, said inwardly extending projections and said interior grooves being generally equally spaced.
References Cited (Backward Citations)
US2212733A
Cited
FR1121902A
Cited
GB847055A
Cited
DE1054798B
Cited
US3479002A
Cited
US3556461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |