US3589065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire vent hatch
Assignee: BOHEM Mfg CO Inc
•
Filing: 1969-12-09
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Granted: 1971-06-29
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Expires: 1989-12-09
Abstract
Abstract A fire vent hatch has a housing with upstanding sidewalls and a cover pivotally secured to one of the sidewalls. A pair of rams are mounted on the housing to raise the cover, the rams being connected to a sealed container containing gas under pressure. The lower end of the rams are each pivotally connected to an arm which in turn is pivotally connected to the housing, the arms swinging downwardly when the rams are actuated. A restrictor is provided to throttle the flow of gas to the cover. A scissor latch is provided for holding the cover in the closed position. Thermally and manually controlled means are provided to release the gas to the rams and to open the latch.
Inventors
- 👤 Robert C Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:12
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; F24F11/00; F24F11/30; F24F11/32; F24F11/33; F24F11/34
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
123 words
In a fire vent hatch comprising a housing having upstanding sidewalls and a cover pivotally secured to one of the sidewalls the improvement comprising: a ram having one end pivotally connected to the cover on an axis parallel to the pivotal axis of the cover and having the other end pivotally connected to a sidewall on an axis parallel to the pivotal axis of the cover and lower than the pivotal axis of said one end, removable means to store a fluid under pressure connected to the ram, and temperature controlled means to control the flow of fluid from the storage means to the ram to provide for the flow of fluid to the ram to raise the cover at a predetermined temperature.
Claim 2
Dependent Claim
123 words
In a fire vent hatch comprising a housing having upstanding sidewalls and a cover pivotally secured to one of the sidewalls the improvement comprising: a ram having one end pivotally connected to the cover on an axis parallel to the pivotal axis of the cover and having the other end pivotally connected to a sidewall on an axis parallel to the pivotal axis of the cover and lower than the pivotal axis of said one end, removable means to store a fluid under pressure connected to the ram, and temperature controlled means to control the flow of fluid from the storage means to the ram to provide for the flow of fluid to the ram to raise the cover at a predetermined temperature.
Claim 3
Dependent Claim
115 words
The device in accordance with claim 1 in which said other end of the ram is pivotally connected to an arm on an axis parallel to the pivotal axis of the cover, the arm is pivotally connected to a side at a point in a vertical plane lying intermediate the vertical plane containing the pivotal axis of said one end of the ram and the vertical plane containing the pivotal connection of the ram to the arm, said arm being free to move downwardly on actuation of the ram to increase the angle between the ram and the cover to increase the force exerted by the ram in the early stages of opening the cover.
Claim 4
Dependent Claim
34 words
The device in accordance with claim 1 having means to release fluid in the ram when the cover reaches a fully open position and having means to retain the cover in said open position.
Claim 5
Dependent Claim
34 words
The device in accordance with claim 2 having means to release fluid in the ram when the cover reaches a fully open position and having means to retain the cover in said open position.
Claim 6
Dependent Claim
77 words
The device in accordance with claim 1 having means to lock the cover in a closed position comprising a bar having substantially horizontal portions spaced below the cover, a fixed keeper plate having a recess accepting one half of the bar and a pivoted keeper plate accepting the other half of the bar and means controlled by the temperature controlled means to hold the pivoted plate in position receiving the bar until said predetermined temperature is reached.
Claim 7
Dependent Claim
78 words
The device in accordance with claim 2 having means to lock the cover in a closed position comprising a bar having a substantially horizontal portion spaced below the cover, a fixed keeper plate having a recess accepting one half of the bar and a pivoted keeper plate accepting the other half of the bar and means controlled by the temperature controlled means to hold the pivoted plate in position receiving the bar until said predetermined temperature is reached.
Claim 8
Dependent Claim
78 words
The device in accordance with claim 3 having means to lock the cover in a closed position comprising a bar having a substantially horizontal portion spaced below the cover, a fixed keeper plate having a recess accepting one half of the bar and a pivoted keeper plate accepting the other half of the bar and means controlled by the temperature controlled means to hold the pivoted plate in position receiving the bar until said predetermined temperature is reached.
Claim 9
Dependent Claim
78 words
The device in accordance with claim 4 having means to lock the cover in a closed position comprising a bar having a substantially horizontal portion spaced below the cover, a fixed keeper plate having a recess accepting one half of the bar and a pivoted keeper plate accepting the other half of the bar and means controlled by the temperature controlled means to hold the pivoted plate in position receiving the bar until said predetermined temperature is reached.
Claim 10
Dependent Claim
70 words
The device in accordance with claim 1 in which the temperature controlled means includes a spring biased actuating lever, a fusible link connected to the lever, connector means connected to the fusible link, a bracket, a pin passing through an opening in the bracket and an opening in the connector means and means to pull the pin out of said openings to permit the spring to move said actuating lever.
Claim 11
Dependent Claim
70 words
The device in accordance with claim 2 in which the temperature controlled means includes a spring biased actuating lever, a fusible link connected to the lever, connector means connected to the fusible link, a bracket, a pin passing through an opening in the bracket and an opening in the connector means and means to pull the pin out of said openings to permit the spring to move said actuating lever.
Claim 12
Dependent Claim
70 words
The device in accordance with claim 4 in which the temperature controlled means includes a spring biased actuating lever, a fusible link connected to the lever, connector means connected to the fusible link, a bracket, a pin passing through an opening in the bracket and an opening in the connector means and means to pull the pin out of said openings to permit the spring to move said actuating lever.
Claim 13
Dependent Claim
70 words
The device in accordance with claim 6 in which the temperature controlled means includes a spring biased actuating lever, a fusible link connected to the lever, connector means connected to the fusible link, a bracket, a pin passing through an opening in the bracket and an opening in the connector means and means to pull the pin out of said openings to permit the spring to move said actuating lever.
Claim 14
Dependent Claim
70 words
The device in accordance with claim 8 in which the temperature controlled means includes a spring biased actuating lever, a fusible link connected to the lever, connector means connected to the fusible link, a bracket, a pin passing through an opening in the bracket and an opening in the connector means and means to pull the pin out of said openings to permit the spring to move said actuating lever.
Claim 15
Dependent Claim
31 words
The device in accordance with claim 1 in which the connection between the fluid storage means and the ram has a restrictor to throttle the flow of fluid to the ram.
Claim 16
Dependent Claim
31 words
The device in accordance with claim 2 in which the connection between the fluid storage means and the ram has a restrictor to throttle the flow of fluid to the ram.
Claim 17
Dependent Claim
31 words
The device in accordance with claim 3 in which the connection between the fluid storage means and the ram has a restrictor to throttle the flow of fluid to the ram.
Claim 18
Dependent Claim
31 words
The device in accordance with claim 4 in which the connection between the fluid storage means and the ram has a restrictor to throttle the flow of fluid to the ram.
Claim 19
Dependent Claim
31 words
The device in accordance with claim 5 in which the connection between the fluid storage means and the ram has a restrictor to throttle the flow of fluid to the ram.
Claim 20
Dependent Claim
31 words
The device in accordance with claim 10 in which the connection between the fluid storage means and the ram has a restrictor to throttle the flow of fluid to the ram.
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |