US3672630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flap valve for suction apparatus
Assignee: Envac Centrlasug AB
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Filing: 1970-04-14
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Granted: 1972-06-27
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Expires: 1990-04-14
Abstract
Abstract A valve in a wall- or floor-mounted connection box for connecting suction apparatus to a central suction system, said valve being biased to closing position against the action of the negative pressure prevailing in the system.
Inventors
- 👤 Per Naumburg
- 👤 Jan Olof Norrman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:22
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/24; A47L9/242; A47L5/00; A47L5/12; A47L5/22; A47L5/38; F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/20; F16K1/2014; F16L; F16L29/00; F16L29/007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
A valve for the connection box of a central suction system adapted to close a connector-inserting longitudinal passage in the box, said valve comprising: a. a valve flap formed of a substantially cylindrical surface segment having a back portion which exceeds in length the diameter of the passage; b. means for mounting said valve flap to the box for pivotal movement within the passage about one end of the back portion; c. a valve seat having a substantially cylindrical section for insertion in the passage; d. said valve flap segment and said valve seat section having mating curved edges which coincide when said valve flap is in the closed position to provide a seal; e. means for biasing said valve flap into a closing position against the atmospheric pressure externally of the box to thereby retain a subatmospheric pressure in the interior of the box, said valve flap back portion in its closed position being inclined to the longitudinal axis of the passage and in its open position being substantially parallel to the surface defining the passage.
Claim 2
Dependent Claim
177 words
A valve for the connection box of a central suction system adapted to close a connector-inserting longitudinal passage in the box, said valve comprising: a. a valve flap formed of a substantially cylindrical surface segment having a back portion which exceeds in length the diameter of the passage; b. means for mounting said valve flap to the box for pivotal movement within the passage about one end of the back portion; c. a valve seat having a substantially cylindrical section for insertion in the passage; d. said valve flap segment and said valve seat section having mating curved edges which coincide when said valve flap is in the closed position to provide a seal; e. means for biasing said valve flap into a closing position against the atmospheric pressure externally of the box to thereby retain a subatmospheric pressure in the interior of the box, said valve flap back portion in its closed position being inclined to the longitudinal axis of the passage and in its open position being substantially parallel to the surface defining the passage.
Claim 3
Dependent Claim
62 words
A valve as defined in claim 1, wherein said surface of said valve flap forms a sector of a cylindrical tube the outer diameter of which is at most equal to the inner diameter of the passage, said sector having such a contour that its projection against the cross sEction of the passage in the closing position of the valve is circular.
Claim 4
Dependent Claim
33 words
A valve as defined in claim 2 wherein the inner diameter of the cylindrical tube is at least as large as the outer diameter of the connector which is inserted within said passage.
Claim 5
Dependent Claim
25 words
A valve as defined in claim 2, wherein said curved edges form the intersection of the cylindrical valve seat and the cylindrical sector valve flap.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |