Patent US3755718A successfully refreshed from Google Patents.
US3755718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination electric lock
Assignee: Individual
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Filing: 1971-09-09
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Granted: 1973-08-28
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Expires: 1991-09-09
Abstract
Abstract Electric lock apparatus including two or more multiple position electrical switches for completing a circuit to actuate an electric unlocking device. The electric unlocking apparatus is operable from a conventional AC power source and also is operable from a self-contained battery in the event of power failure. Provisions are made for using the same basic switching arrangement for providing separate unlocking combinations for controlling two or more locks. A simplified provision for changing the unlocking combinations is shown.
Inventors
- 👤 N Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:48
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00658; G07C9/00666
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
280 words
A combination electric lock comprising: at least two electrical switching means each of which has a common terminal selectively engageable in circuit with one of a plurality of switch contacts; circuit means establishing electrical circuit between the common terminal of one of said switching means and a first switching contact of the other of said switching means; a first control circuit establishing electrical circuit between the common terminal of said other switching means and a first switching contact of said one switching means, said control circuit being connected to receive a source of electrical power and including an electrically actuated means; said electrically actuated means comprising an electrically actuated lock device connected in said first control circuit; first control switch means operatively connected in said first control circuit and selectively operable to complete a circuit connecting said lock device with the power source when said common terminal of said one switching means is in circuit communication with said first switching contact of said one switching means; said one switching means comprising a multiple contact rotary switch means having a common terminal capable of continuous rotation for selective engagement in circuit with any one of said plurality of switch contacts; switch operating means operatively connected to rotate said common terminal; an indicium disposed for rotation with said switch operating means; position indication means fixedly mounted relative to said switch operating means for indication coaction with said indicium; and means adjustably interconnecting said switch operating means for selective continuous rotation relative to said rotatable common terminal to selectively vary the indication coaction between said indicium and said position indication means without changing the switch contact actually selectively engaged by said common terminal.
Claim 2
Dependent Claim
280 words
A combination electric lock comprising: at least two electrical switching means each of which has a common terminal selectively engageable in circuit with one of a plurality of switch contacts; circuit means establishing electrical circuit between the common terminal of one of said switching means and a first switching contact of the other of said switching means; a first control circuit establishing electrical circuit between the common terminal of said other switching means and a first switching contact of said one switching means, said control circuit being connected to receive a source of electrical power and including an electrically actuated means; said electrically actuated means comprising an electrically actuated lock device connected in said first control circuit; first control switch means operatively connected in said first control circuit and selectively operable to complete a circuit connecting said lock device with the power source when said common terminal of said one switching means is in circuit communication with said first switching contact of said one switching means; said one switching means comprising a multiple contact rotary switch means having a common terminal capable of continuous rotation for selective engagement in circuit with any one of said plurality of switch contacts; switch operating means operatively connected to rotate said common terminal; an indicium disposed for rotation with said switch operating means; position indication means fixedly mounted relative to said switch operating means for indication coaction with said indicium; and means adjustably interconnecting said switch operating means for selective continuous rotation relative to said rotatable common terminal to selectively vary the indication coaction between said indicium and said position indication means without changing the switch contact actually selectively engaged by said common terminal.
Claim 3
Dependent Claim
257 words
A combination electric lock comprising: at least two electrical switching means each of which has a common terminal selectively engageable in circuit with one of a plurality of switch contacts; circuit means establishing electrical circuit between the common terminal of one of said switching means and a first switching contact of the other of said switching means; a first control circuit establishing electrical circuit between the common terminal of said other switching means and a first switching contact of said one switching means, said control circuit being connected to receive a source of electrical power and including an electrically actuated means; said electrically actuated means comprising a first electrically actuated lock device connected in said first control circuit; first control switch means operatively connected in said first control circuit and selectively operable to complete a circuit connecting said common terminal of said other switching means with said first switching contact of said one switching means, the power source, and the first lock device; a second electrically actuated lock device; a second control circuit including the common terminal of said other switching means and a second switching contact of said one switching means; said second control circuit being connected to receive a source of electrical power and including said second lock device; and second control switch means operatively connected in said second control circuit and selectively operable to complete a circuit connecting said common terminal of said other switching means with said second switching contact of said one switching means, the power source, and said second lock device.
Claim 4
Dependent Claim
257 words
A combination electric lock comprising: at least two electrical switching means each of which has a common terminal selectively engageable in circuit with one of a plurality of switch contacts; circuit means establishing electrical circuit between the common terminal of one of said switching means and a first switching contact of the other of said switching means; a first control circuit establishing electrical circuit between the common terminal of said other switching means and a first switching contact of said one switching means, said control circuit being connected to receive a source of electrical power and including an electrically actuated means; said electrically actuated means comprising a first electrically actuated lock device connected in said first control circuit; first control switch means operatively connected in said first control circuit and selectively operable to complete a circuit connecting said common terminal of said other switching means with said first switching contact of said one switching means, the power source, and the first lock device; a second electrically actuated lock device; a second control circuit including the common terminal of said other switching means and a second switching contact of said one switching means; said second control circuit being connected to receive a source of electrical power and including said second lock device; and second control switch means operatively connected in said second control circuit and selectively operable to complete a circuit connecting said common terminal of said other switching means with said second switching contact of said one switching means, the power source, and said second lock device.
Claim 5
Dependent Claim
34 words
Apparatus as in claim 2, further comprising: second circuit means establishing electrical circuit between said common terminal of said one switching means and a second switching contact of the other of said switching means.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |