Patent US2579369A successfully refreshed from Google Patents.
Patent US4214729A successfully refreshed from Google Patents.
US4214729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Connecting valve
Assignee: Svenska Flaktfabriken AB
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Filing: 1978-11-20
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Granted: 1980-07-29
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Expires: 1998-11-20
Abstract
Abstract The present invention relates to a connecting valve for connecting the hose of vacuum cleaning equipment into the suction duct of a built-in cleaning system. The connecting valve is positioned behind a flap cover for the suction duct opening and comprises a pair of complimentary valve elements which mate in closed position to close the duct opening, and which provide straight tubular passageway when open for accepting the tubular end of the hose of the vacuuming equipment. Each valve element is formed of a segment of a tubular pipe and is pivoted adjacent the duct opening so that it may be operated from closed position to open position by the insertion of the end of the vacuum hose into the opening. Each element is biased toward closed position so that withdrawal of the hose effects closing of the valve.
Inventors
- 👤 Rune Narfgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:43
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/38; F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/026; F16K15/03; F16K15/033; F16K15/035; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6966; Y10T137/6969; Y10T137/698; Y10T137/6988
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
A connecting valve for connecting a tubular connecting nozzle for a vacuum cleaning equipment to a suction duct system, said nozzle having a cylindrical outer surface, said connecting valve consisting of a valve housing provided with an outer cover, and an inner shut-off device for the vacuum in the suction duct system actuated by the connecting nozzle and provided with at least two spring-prestressed flaps (13,14) mounted for pivotal movement on shafts in the upstream portion (12) of the valve housing (1), which flaps in closed position abut each other and thereby form a funnel-shaped closure of the mouth of the suction duct (7), the point end of the funnel being directed inward to the duct, each flap being formed as a portion cut out of a cylindrical pipe wall, the concave surface (15,16) of which agrees with the outer surface of the connecting nozzle, said shafts being mounted in grooves (19,20) permitting outward displacement of said shafts in the valve housing in order to bring about a combined rotation and displacing movement of the flaps upon insertion of the connecting nozzle therebetween.
Claim 2
Dependent Claim
183 words
A connecting valve for connecting a tubular connecting nozzle for a vacuum cleaning equipment to a suction duct system, said nozzle having a cylindrical outer surface, said connecting valve consisting of a valve housing provided with an outer cover, and an inner shut-off device for the vacuum in the suction duct system actuated by the connecting nozzle and provided with at least two spring-prestressed flaps (13,14) mounted for pivotal movement on shafts in the upstream portion (12) of the valve housing (1), which flaps in closed position abut each other and thereby form a funnel-shaped closure of the mouth of the suction duct (7), the point end of the funnel being directed inward to the duct, each flap being formed as a portion cut out of a cylindrical pipe wall, the concave surface (15,16) of which agrees with the outer surface of the connecting nozzle, said shafts being mounted in grooves (19,20) permitting outward displacement of said shafts in the valve housing in order to bring about a combined rotation and displacing movement of the flaps upon insertion of the connecting nozzle therebetween.
Claim 3
Dependent Claim
21 words
A connecting valve according to claim 1, including torsion springs mounted about the shafts of the flaps for prestressing the flaps.
Claim 4
Dependent Claim
32 words
A connecting valve according to claim 1 including spring means for each flap urging said shaft means toward the center of said housing and said flaps toward closed position throughout their movement.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |