US3829138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remotely controlled latch system for fire doors and the like
Assignee: Individual
•
Filing: 1972-10-27
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Granted: 1974-08-13
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Expires: 1992-10-27
Abstract
Abstract A remotely controlled latch system for releasably retaining a fire door or the like in a position in readiness for automatic closing to close a passage or opening. The latch system comprises latch apparatus including a dead bolt which is operable to a retracted and a projected position in which it unlatches or unlocks the door and locks it respectively. A bolt-release mechanism, operated remotely, has a latched operator or actuator that is released from a retracted position to assume a projected position in which it engages the dead bolt and causes it to assume its retracted or unlatched position. The remote control signal is applied by a sensor that senses physical conditions indicative of the presence or existence of a fire. The position of the actuator is continuously sensed and when it assumes its projected position an electrical signal is generated by a sensing switch. This signal is employed for de-energizing a solenoid that controls the unlatching or release of the actuator and may be used to indicate the operative unlatched condition of the latch system and thereby indicate that the fire door associated with the system is closed.
Inventors
- 👤 Y Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:01
CPC Classifications
E; E05; E05B; E05B63/00; E05B63/24; E05B63/248; E05B47/00; E05C; E05C17/00; Y; Y10; Y10T; Y10T292/00; Y10T292/175; Y10T292/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
In a door latch system, a latch automatically opened by remote control comprising, a dead bolt operable to a retracted position and biased to a projected position corresponding to a latching position, a bolt-release mechanism having a bolt-release member operable to a retracted position and a projected position and mountable opposed to the dead bolt, biasing means biasing the bolt-release member to a projected position for engaging the dead bolt in its projected position and biasing it to a retracted position, electrically actuated actuator means releasably latching said bolt-release member in its retracted position, means in said actuator means for receiving an electrical command signal to effect release of said bolt-release member for actuation to its projected position under control of said biasing means, and an electrical switch having a sensor sensing the position of said bolt-release member to control de-energization of said actuator means when the bolt-release member assumes its projected position and for initiating a signal indicating the bolt-release member is in a projected state thereby indicating the lock is unlocked.
Claim 2
Dependent Claim
173 words
In a door latch system, a latch automatically opened by remote control comprising, a dead bolt operable to a retracted position and biased to a projected position corresponding to a latching position, a bolt-release mechanism having a bolt-release member operable to a retracted position and a projected position and mountable opposed to the dead bolt, biasing means biasing the bolt-release member to a projected position for engaging the dead bolt in its projected position and biasing it to a retracted position, electrically actuated actuator means releasably latching said bolt-release member in its retracted position, means in said actuator means for receiving an electrical command signal to effect release of said bolt-release member for actuation to its projected position under control of said biasing means, and an electrical switch having a sensor sensing the position of said bolt-release member to control de-energization of said actuator means when the bolt-release member assumes its projected position and for initiating a signal indicating the bolt-release member is in a projected state thereby indicating the lock is unlocked.
Claim 3
Dependent Claim
21 words
In a door latch system, according to claim 1, including biasing means continuously biasing the dead bolt to its projected position.
Claim 4
Dependent Claim
26 words
In a door latch system, according to claim 2, in which said means in said actuator means for receiving said electrical command signal comprises a solenoid.
Claim 5
Dependent Claim
25 words
In a door latch system, according to claim 3, in which said actuator comprises a latch actuatable by said solenoid for releasing said bolt-release member.
Claim 6
Dependent Claim
140 words
In combination, a fire door, biasing means biasing said door to a closed position, a latch system releasably retaining said door in a position of readiness for release by remote control for movement to a closed position under control of said biasing means comprising a latch means mounted on the door biased toward a projected position latching the fire door in said position of readiness, an actuator mechanism mounted in an area framing the door and having means in a retracted position operable to a projected position by remote control in response to a control command signal for engaging said latch means in its projected position and unlatching the door by activating said latch means to its retracted position, means for generating said control command signal upon detection of a physical quantity indicating the presence of burning of a substance.
Claim 7
Dependent Claim
140 words
In combination, a fire door, biasing means biasing said door to a closed position, a latch system releasably retaining said door in a position of readiness for release by remote control for movement to a closed position under control of said biasing means comprising a latch means mounted on the door biased toward a projected position latching the fire door in said position of readiness, an actuator mechanism mounted in an area framing the door and having means in a retracted position operable to a projected position by remote control in response to a control command signal for engaging said latch means in its projected position and unlatching the door by activating said latch means to its retracted position, means for generating said control command signal upon detection of a physical quantity indicating the presence of burning of a substance.
Claim 8
Dependent Claim
83 words
The combination according to claim 5, in which said latch means comprises a rod in said door mounting a roller actuated to a projected position latching the door and to a retracted position unlatching the door, means constantly biasing said rod for maintaining said rod in a position retaining said roller in its projected position, said actuator means in a retracted position being disposed for engaging the periphery of said roller and actuating said rod for retracting said roller to its retracted position.
Claim 9
Dependent Claim
95 words
The combination according to claim 5, in which said latch means comprises a dead bolt biased to a projecTed position corresponding to a position in which said fire door is releasably latched in said position of readiness, said actuator mechanism comprising a bolt-release mechanism having a bolt-release member operable to a retracted position and a projected position corresponding to a position in which said bolt-release member engages the dead bolt in its projected position and biases it to a retracted position, said actuator means including means actuated electrically for latching and unlatching said bolt-release member.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |