Patent US3751086A successfully refreshed from Google Patents.
US3751086A
Expired / Lapsed
US
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Fail-safe means for solenoid actuated devices
Assignee: Individual
•
Filing: 1972-07-12
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Granted: 1973-08-07
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Expires: 1992-07-12
Abstract
Abstract Fail-safe means for solenoid actuated devices, such as door locks, valves and the like, wherein the actuated element is operable to an active position upon energization of the solenoid, and upon deenergization of the solenoid is activated by a compression spring to an inactive position. A pair of permanent magnets provide the fail-safe feature, whereby the actuated element will be moved to its inactive position, in the event of spring failure. One of these magnets is fixedly mounted, and the other is carried by the actuated element, the magnets being so oriented as to present closely confronting like magnetic poles in a repulsion mode when the actuated element is in its active position.
Inventors
- 👤 A Geringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:29
CPC Classifications
E; E05; E05B; E05B47/00; E05B47/02; E05B47/026; E05B47/0001; E05B47/0002; E05B15/00; E05B15/10; E05B15/101; E05B47/0003; E05B47/0004; E05B47/0038; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/0999; Y10T292/1014; Y10T292/1021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
195 words
A fail-safe lock structure, comprising: a. a housing; b. a bolt reciprocating within the housing to an active position and an inactive position; c. a keeper engaged by the bolt when in active position; d. a bolt actuator within the housing, including a solenoid coil and a solenoid plunger, the bolt being connected to the plunger and being moved to active position upon energization of the solenoid coil; e. spring means operatively associated with the bolt and being compressed when the bolt is actuated to active position and forcing the bolt to inactive position upon deenergization of the solenoid coil; f. a first magnet carried by the keeper engaging end of the bolt; g. a second magnet mounted in the housing in alignment with the bolt; h. the two magnets being mounted in their respective positions with like poles in face-to-face relationship, whereby to produce in the active position of said bolt a force to normally augment the force of said spring in moving the bolt to its inactive position, upon deenergization of tHe solenoid coil, and upon failure of said spring provide a solely acting force for moving said bolt to said inactive position.
Claim 2
Dependent Claim
195 words
A fail-safe lock structure, comprising: a. a housing; b. a bolt reciprocating within the housing to an active position and an inactive position; c. a keeper engaged by the bolt when in active position; d. a bolt actuator within the housing, including a solenoid coil and a solenoid plunger, the bolt being connected to the plunger and being moved to active position upon energization of the solenoid coil; e. spring means operatively associated with the bolt and being compressed when the bolt is actuated to active position and forcing the bolt to inactive position upon deenergization of the solenoid coil; f. a first magnet carried by the keeper engaging end of the bolt; g. a second magnet mounted in the housing in alignment with the bolt; h. the two magnets being mounted in their respective positions with like poles in face-to-face relationship, whereby to produce in the active position of said bolt a force to normally augment the force of said spring in moving the bolt to its inactive position, upon deenergization of tHe solenoid coil, and upon failure of said spring provide a solely acting force for moving said bolt to said inactive position.
Claim 3
Dependent Claim
40 words
A fail-safe lock structure according to claim 1, wherein the first magnet is fixedly mounted on the keeper engaging end of the bolt, and the second magnet is fixedly mounted on an opposite side of said keeper from said bolt.
Claim 4
Dependent Claim
76 words
A fail-safe lock structure according to claim 1, including an energizing circuit connecting said solenoid core with an electrical source; switch means having normally open contacts in said circuit operable to circuit closing position in response to movement of said door parts to a door closed position; and a supplemental device having normally closed contacts in said circuit ahead of the contacts of said switch means, for interrupting the circuit upon activation of said supplemental device.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |