US3698429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas tight isolators and valves
Assignee: Thermo Technical Development Ltd
•
Filing: 1971-02-01
•
Granted: 1972-10-17
•
Expires: 1991-02-01
Abstract
Abstract A cantilever seal for an isolator or valve comprises a cantilever leaf spring and a bias spring acting on the leaf spring to tension the leaf spring when in a free position, the bias spring being itself tensioned to press the leaf spring against a seating when the seal is in a sealing position. An isolating valve for a flue or duct is provided with two sets of flexible cantilever leaf springs facing in opposite directions of the duct, the cantilever leaf springs forming a pair of opposed co-operating seals when the duct is closed; these cantilever leaf springs may be provided with bias springs arranged to act thereon as described above. Preferably the bias spring or springs cause the leaf spring to have a curved cross section in the free position, and the leaf spring is flat in the sealing position.
Inventors
- 👤 Walter Max Lowe
- 👤 Frederick Squirrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:45
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/165; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/8741; Y10T137/87442; Y10T137/8745; Y10T137/87467; Y10T137/87475
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
125 words
An isolator of the pivoted louver or hinged type, comprising: a framework having at least one fixed member disposed across a duct, at least one movable member operable between an open and closed positions, cantilever seals disposed at the margins of at least one of said members, to overlap a margin of an adjacent member when in the closed position, each of said cantilever seals comprise a cantilever leaf spring and at least one bias spring acting on said leaf spring to tension said leaf spring so as to curve said leaf spring when said movable member is in the open position, and to press said leaf spring flat against said margin of an adjacent member when said movable meMber is in the closed position.
Claim 2
Dependent Claim
125 words
An isolator of the pivoted louver or hinged type, comprising: a framework having at least one fixed member disposed across a duct, at least one movable member operable between an open and closed positions, cantilever seals disposed at the margins of at least one of said members, to overlap a margin of an adjacent member when in the closed position, each of said cantilever seals comprise a cantilever leaf spring and at least one bias spring acting on said leaf spring to tension said leaf spring so as to curve said leaf spring when said movable member is in the open position, and to press said leaf spring flat against said margin of an adjacent member when said movable meMber is in the closed position.
Claim 3
Dependent Claim
24 words
An isolator as claimed in claim 1, wherein said cantilever seals are positioned to be biased toward a higher pressure side of said isolator.
Claim 4
Dependent Claim
129 words
An isolator of a sliding type, comprising: A fixed frame disposed in a duct, a movable member adapted to slide across said duct in said fixed frame in a direction transverse to a longitudinal axis of said duct, cantilever seals disposed on said fixed frame to seal against said movable member when said movable member is in a closed position in said duct, each of said cantilever seals comprise a cantilever leaf spring and at least one bias spring acting on said leaf spring to tension said leaf spring so as to curve said leaf spring when said cantilever seal is not in a sealing position, and to press said leaf spring flat against said movable member when said movable member is in said closed position across said duct.
Claim 5
Dependent Claim
129 words
An isolator of a sliding type, comprising: A fixed frame disposed in a duct, a movable member adapted to slide across said duct in said fixed frame in a direction transverse to a longitudinal axis of said duct, cantilever seals disposed on said fixed frame to seal against said movable member when said movable member is in a closed position in said duct, each of said cantilever seals comprise a cantilever leaf spring and at least one bias spring acting on said leaf spring to tension said leaf spring so as to curve said leaf spring when said cantilever seal is not in a sealing position, and to press said leaf spring flat against said movable member when said movable member is in said closed position across said duct.
Claim 6
Dependent Claim
104 words
An isolator of a sliding type, comprising: A movable member adapted to slide across a duct in a direction transverse to a longitudinal axis of said duct, cantilever seals disposed on said movable member, each of said cantilever seals comprise a cantilever leaf spring and at least one bias spring acting on said leaf spring to tension said leaf spring so as to curve said leaf spring when said seal is not in a sealing position, and at least one of said bias springs being tensioned to press said leaf spring flat against a spring seat when said seal is in said sealing position.
Claim 7
Dependent Claim
104 words
An isolator of a sliding type, comprising: A movable member adapted to slide across a duct in a direction transverse to a longitudinal axis of said duct, cantilever seals disposed on said movable member, each of said cantilever seals comprise a cantilever leaf spring and at least one bias spring acting on said leaf spring to tension said leaf spring so as to curve said leaf spring when said seal is not in a sealing position, and at least one of said bias springs being tensioned to press said leaf spring flat against a spring seat when said seal is in said sealing position.
Claim 8
Dependent Claim
135 words
An isolating valve for a duct comprising: A fixed member forming a framework across said duct, at least one movable member disposed within said duct operable between open and closed positions, two sets of flexible cantilever leaf springs facing in opposite directions of said duct so that sealing of said duct is achieved when said movable member is in said closed position in that said cantilever leaf springs form a pair of opposed co-operating seals, each of said cantilever leaf springs being provided with at least one bias spring acting on said leaf spring to tension said leaf spring so as to curve said leaf spring when said movable member is in said open position, and to press said leaf spring flat against a spring seat when said movable member is in said closed position.
Claim 9
Dependent Claim
135 words
An isolating valve for a duct comprising: A fixed member forming a framework across said duct, at least one movable member disposed within said duct operable between open and closed positions, two sets of flexible cantilever leaf springs facing in opposite directions of said duct so that sealing of said duct is achieved when said movable member is in said closed position in that said cantilever leaf springs form a pair of opposed co-operating seals, each of said cantilever leaf springs being provided with at least one bias spring acting on said leaf spring to tension said leaf spring so as to curve said leaf spring when said movable member is in said open position, and to press said leaf spring flat against a spring seat when said movable member is in said closed position.
Claim 10
Dependent Claim
27 words
An isolating valve as claimed in claim 5, wherein at least one of said movable members is arranged to pivot between said open and said closed positions.
Claim 11
Dependent Claim
37 words
An isolating valve as claimed in claim 5, wherein at least one of said movable members is a sliding member arranged to slide across said duct in a direction transverse to a longitudinal axis of said duct.
Claim 12
Dependent Claim
50 words
An isolating valve as claimed in claim 7, wherein said cantilever leaf springs are provided on opposite sides of, and at the margins of at least one of said movable members and said fixed member so as to overlap a margin of an adjacent member when in said closed position.
Claim 13
Dependent Claim
38 words
An isolating valve as claimed in claim 7, wherein a leading edge of at least one of said movable members is provided with a lead-in taper so as to guide said cantilever leaf springs to their sealing position.
Claim 14
Dependent Claim
15 words
An isolating valve as claimed in claim 7, wherein said movable member is generally wedge-shaped.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |