Patent US3741101A successfully refreshed from Google Patents.
US3741101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravity operated ventilator unit
Assignee: EXITAIRE CO
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Filing: 1972-02-14
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Granted: 1973-06-26
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Expires: 1992-02-14
Abstract
Abstract A gravity operated automatically opening ventilator unit which is easily installed in the roof of a building and which, at a predetermined temperature, will automatically open to vent smoke, gases and heat from the interior of the building to atmosphere.
Inventors
- 👤 A Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:23
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; F24F11/00; F24F11/30; F24F11/32; F24F11/33; F24F11/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
An automatically opening ventilator unit comprising: a. a hollow housing adapted to be installed in a building so as to form an exhaust passageway; b. a pair of cooperating closure members for closing the exhaust passageway, said members being pivotally connected to said housing and adapted to swingably move, due to the urging of gravity, from a normally closed position into an open position; c. a fusible link releasably holding said closure member in a normally closed position, said fusible link being subject to failure at a predetermined elevated temperature; d. means for manually operating said cooperating closure members, including a length of chain interconnecting said closure members, said chain including a plurality of interconnected links and embodying said fusible link; and e. means for releasably coupling a pair of links of said chain, said means being manually operable from inside the building to decouple the links of said chain so as to allow said closure members to move into an open position.
Claim 2
Dependent Claim
163 words
An automatically opening ventilator unit comprising: a. a hollow housing adapted to be installed in a building so as to form an exhaust passageway; b. a pair of cooperating closure members for closing the exhaust passageway, said members being pivotally connected to said housing and adapted to swingably move, due to the urging of gravity, from a normally closed position into an open position; c. a fusible link releasably holding said closure member in a normally closed position, said fusible link being subject to failure at a predetermined elevated temperature; d. means for manually operating said cooperating closure members, including a length of chain interconnecting said closure members, said chain including a plurality of interconnected links and embodying said fusible link; and e. means for releasably coupling a pair of links of said chain, said means being manually operable from inside the building to decouple the links of said chain so as to allow said closure members to move into an open position.
Claim 3
Dependent Claim
165 words
An automatically opening ventilator unit comprising: a. a hollow housing adapted to be installed in a building so as to form an exhaust passageway; b. a pair of cooperating closure members for closing the exhaust passageway, said members being pivotally connected to said housing and adapted to swingably move, due to the urging of gravity, from a normally closed position into an open position; c. a fusible link releasably holding said closure members in a normally closed position, said fusible link being subject to failure at a predetermined elevated temperature; and d. means for manually operating said cooperating closure members, including a length of chain interconnecting said closure members, said chain including a plurality of interconnected links and embodying said fusible link, said chain being releasably connected to one of said cooperating closure members and further including manually operable means for disconnecting said chain from said closure member from outside the building so as to allow said closure member to move into an open position.
Claim 4
Dependent Claim
165 words
An automatically opening ventilator unit comprising: a. a hollow housing adapted to be installed in a building so as to form an exhaust passageway; b. a pair of cooperating closure members for closing the exhaust passageway, said members being pivotally connected to said housing and adapted to swingably move, due to the urging of gravity, from a normally closed position into an open position; c. a fusible link releasably holding said closure members in a normally closed position, said fusible link being subject to failure at a predetermined elevated temperature; and d. means for manually operating said cooperating closure members, including a length of chain interconnecting said closure members, said chain including a plurality of interconnected links and embodying said fusible link, said chain being releasably connected to one of said cooperating closure members and further including manually operable means for disconnecting said chain from said closure member from outside the building so as to allow said closure member to move into an open position.
Claim 5
Dependent Claim
157 words
A gravity operated automatically opening ventilator unit comprising: a. a hollow housing comprising interconnected side and end walls forming an exhaust passageway; b. a pair of cooperating top members pivotally connected to said end walls, said top members being adapted to cooperate to close the exhaust passageway and to swingably move, due to the urging of gravity, from a closed position into a position opening the exhaust passageway; c. a length of chain embodying a fusible link interconnecting said top members so as to hold them in a closed position, said fusible link being adapted to fail at a predetermined elevated temperature so as to allow said top members to swingably move into a position opening the exhaust passageway; and d. means for manually moving said top members into a position opening the exhaust passageway, said means comprising means for releasably coupling a pair of links of said chain, and being manually operable from inside the building.
Claim 6
Dependent Claim
157 words
A gravity operated automatically opening ventilator unit comprising: a. a hollow housing comprising interconnected side and end walls forming an exhaust passageway; b. a pair of cooperating top members pivotally connected to said end walls, said top members being adapted to cooperate to close the exhaust passageway and to swingably move, due to the urging of gravity, from a closed position into a position opening the exhaust passageway; c. a length of chain embodying a fusible link interconnecting said top members so as to hold them in a closed position, said fusible link being adapted to fail at a predetermined elevated temperature so as to allow said top members to swingably move into a position opening the exhaust passageway; and d. means for manually moving said top members into a position opening the exhaust passageway, said means comprising means for releasably coupling a pair of links of said chain, and being manually operable from inside the building.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |