US3735781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve unit
Assignee: SCHRADER BELLOWS Inc A CORP OF DE
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Filing: 1971-11-09
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Granted: 1973-05-29
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Expires: 1991-11-09
Abstract
Abstract A valve unit or rectilinear positioning device having a plurality of operating positions and arranged such as to hold the operating position last encountered upon inactivation of the valve or positioning device moving and control means comprising a body including a bore, a slide positioner or slide valve reciprocable in the bore between the two operating positions, at least two elastic ring seals spaced along the bore, and partially recessed into the periphery thereof, said seals having an unexpanded ring diameter substantially equal to or slightly less than the ring diameter of complemental detents or recesses on the slide positioner into which the seals are selectively seated, means for applying fluid pressure to the ring seals and to the ends of the slide positioner or slide valve, and means for locking and unlocking the elastic ring seals to the slide positioner simultaneously with moving it to the next operating position and holding it in that position upon inactivation of the moving means.
Inventors
- 👤 R Kesti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:24
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/42; F16K31/423; F16K31/426; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86485; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86614; Y10T137/86879
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
211 words
A valve unit comprising: a. a body including a bore and a plurality of pressure fluid flowing ports communicating with said bore; b. a slide valve reciprocable in said bore between two operating positions selectively to interconnect said ports; c. at least two elastic ring seals spaced along said bore and partially recessed into the periphery thereof, said seals having an unexpanded ring diameter substantially equal to or slightly less than the ring diameter of complemental detents or recesses on the slide positioner into which the seals are selectively seated; d. first means for applying fluid pressure to said ring seals, to contract and expand them in their respective recesses and for applying fluid pressure to the ends of said slide valve; and e. second means for causing said first means to selectively expand at least one of said ring seals into its recess in said bore and contract at least one of said ring seals into engagement with said slide valve while simultaneously urging said slide valve to the other operating position where said contracted ring seal will seat in a complemental detent on said slide valve to immobilize said valve such that, upon inactivation of either said first or said second means, said slide valve is restrained from movement.
Claim 2
Dependent Claim
211 words
A valve unit comprising: a. a body including a bore and a plurality of pressure fluid flowing ports communicating with said bore; b. a slide valve reciprocable in said bore between two operating positions selectively to interconnect said ports; c. at least two elastic ring seals spaced along said bore and partially recessed into the periphery thereof, said seals having an unexpanded ring diameter substantially equal to or slightly less than the ring diameter of complemental detents or recesses on the slide positioner into which the seals are selectively seated; d. first means for applying fluid pressure to said ring seals, to contract and expand them in their respective recesses and for applying fluid pressure to the ends of said slide valve; and e. second means for causing said first means to selectively expand at least one of said ring seals into its recess in said bore and contract at least one of said ring seals into engagement with said slide valve while simultaneously urging said slide valve to the other operating position where said contracted ring seal will seat in a complemental detent on said slide valve to immobilize said valve such that, upon inactivation of either said first or said second means, said slide valve is restrained from movement.
Claim 3
Dependent Claim
18 words
The valve of claim 1 wherein said ring seals are located near the ends of said slide valve.
Claim 4
Dependent Claim
25 words
The valve of claim 1 wherein said recesses and said detents comprise round-bottom grooves of slightly greater radius than the radius of said ring seals.
Claim 5
Dependent Claim
11 words
The valve of claim 1 wherein said recesses comprise stepped grooves.
Claim 6
Dependent Claim
215 words
A valve unit comprising: a. a body including a bore and a plurality of pressure fluid flowing ports communicating with said bore; b. a slide valve reciprocable in said bore between two operating positions selectively to interconnect said parts; c. at least two elastic ring seals spaced along said bore and partially recessed into the periphery thereof, said seals having an unexpanded ring diameter substantially equal to or slightly less than the ring diameter of complemental detents or recesses on the slide positioner into which the seals are selectively seated; d. first means for applying fluid pressure to said ring seals, to contract and expand them in their respective recesses and for applying fluid pressure to the ends of said slide valve; and, e. second means including a pilot valve for causing said first means to selectively expand at least one of said ring seals into its recess in said bore and contract at least one of said ring seals into engagement with said slide valve while simultaneously urging said slide valve to the other operating position where said contracted ring seal will seat in a complemental detent on said slide valve to immobilize said valve such that, upon inactivation of either said first or said second means, said slide valve is restrained from movement.
Claim 7
Dependent Claim
215 words
A valve unit comprising: a. a body including a bore and a plurality of pressure fluid flowing ports communicating with said bore; b. a slide valve reciprocable in said bore between two operating positions selectively to interconnect said parts; c. at least two elastic ring seals spaced along said bore and partially recessed into the periphery thereof, said seals having an unexpanded ring diameter substantially equal to or slightly less than the ring diameter of complemental detents or recesses on the slide positioner into which the seals are selectively seated; d. first means for applying fluid pressure to said ring seals, to contract and expand them in their respective recesses and for applying fluid pressure to the ends of said slide valve; and, e. second means including a pilot valve for causing said first means to selectively expand at least one of said ring seals into its recess in said bore and contract at least one of said ring seals into engagement with said slide valve while simultaneously urging said slide valve to the other operating position where said contracted ring seal will seat in a complemental detent on said slide valve to immobilize said valve such that, upon inactivation of either said first or said second means, said slide valve is restrained from movement.
Claim 8
Dependent Claim
14 words
The valve unit of claim 5 wherein said second means includes two pilot valves.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |