US3659624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire safety valve
Assignee: Otis Engineering Corp
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Filing: 1970-04-06
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Granted: 1972-05-02
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Expires: 1990-04-06
Abstract
Abstract A heat responsive safety valve having a fusible material holding the valve at an open position. In one form the fusible material mechanically locks the valve open. In another form, the fusible material holds fluid pressure within a closed cylinder biasing a valve to its open position. In each form of the valve, the fusible material melts or otherwise weakens at a predetermined temperature releasing the valve to close shutting off flow through the conductor controlled by the valve as a firepreventing measure.
Inventors
- 👤 Warner M Kelly
- 👤 John V Fredd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:59
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/36; F16K17/38; F16K17/383; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1819
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
267 words
A fire safety valve comprising: a valve body; a valve movable between open and closed positions in said body; means biasing said valve toward said closed position; a housing on said valve body, said housing having an internal annular surface portion defining a locking shoulder and an enlarged internal annular surface portion defining a collet release recess; a stem on said valve having an end portion extending into said housing; and means for holding said valve at said open position including a compressible locking collet releasable disposed in said housing, a first end of said collet engaging said end portion of said valve stem in said housing for holding said stem against movement toward said closed position of said valve, a second compressible end of said collet engaging said locking shoulder in said housing, said second end of said collet being releasable from said shoulder responsive to inward camming action of said shoulder on said collet compressing said collet inwardly and fusible means within said second end of said collet and responsive to a predetermined temperature holding said second end of said collet against compression and release from said locking shoulder whereby said collet holds said valve stem against movement toward said closed position of said valve until said fusible means releases said collet responsive to said predetermined temperature to permit said locking shoulder to compress said second end of said collet for movement past said locking shoulder and said first end of said collet to move into alignment with said release recess of said housing to allow said stem to move to said valve closed position.
Claim 2
Dependent Claim
267 words
A fire safety valve comprising: a valve body; a valve movable between open and closed positions in said body; means biasing said valve toward said closed position; a housing on said valve body, said housing having an internal annular surface portion defining a locking shoulder and an enlarged internal annular surface portion defining a collet release recess; a stem on said valve having an end portion extending into said housing; and means for holding said valve at said open position including a compressible locking collet releasable disposed in said housing, a first end of said collet engaging said end portion of said valve stem in said housing for holding said stem against movement toward said closed position of said valve, a second compressible end of said collet engaging said locking shoulder in said housing, said second end of said collet being releasable from said shoulder responsive to inward camming action of said shoulder on said collet compressing said collet inwardly and fusible means within said second end of said collet and responsive to a predetermined temperature holding said second end of said collet against compression and release from said locking shoulder whereby said collet holds said valve stem against movement toward said closed position of said valve until said fusible means releases said collet responsive to said predetermined temperature to permit said locking shoulder to compress said second end of said collet for movement past said locking shoulder and said first end of said collet to move into alignment with said release recess of said housing to allow said stem to move to said valve closed position.
Claim 3
Dependent Claim
32 words
A valve as defined in claim 1 wherein said collet has an internal annular recess in the upper end thereof and said fusible means in a disc disposed in said annular recess.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |