Patent US3877266A successfully refreshed from Google Patents.
US3877266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-key locking system
Assignee: ELLOCK INTERNATIONAL Inc
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Filing: 1974-03-28
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Granted: 1975-04-15
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Expires: 1994-03-28
Abstract
Abstract An electrical key-actuated security locking system used with a central control area and one or more remote secure areas having access closures movable between open and closed positions and locking members associated with each closure is provided with electrically actuated locking and unlocking coils operable for driving the locking member between its locking and unlocking positions; a first control switch in the central control area and a second control switch in series with and remotely located from the first switch. The control switches are key-actuated and electrically connected through a security switch unit to the unlocking coil for actuation thereof upon closing of the first and second switches to drive the locking member to its unlocking position. A holding circuit is operatively associated with the locking coil and activated in response to movement of the locking member to its unlocking position and movement of the access closure to an open position. The locking coil is conditioned for actuation upon return of the access closure to its closed position. The security switch unit is operatively controlled from the interior of the secure area and controls the operation of the holding circuit. The security unit is operative to interrupt both the locking and unlocking circuits to secure the secure area by preventing key-actuated operation of the locking member and controlling operation of an alarm system.
Inventors
- 👤 John D Mclaughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:26
CPC Classifications
E; E05; E05B; E05B47/00; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7062; Y10T70/7113
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
248 words
An electrical key-actuated security locking system comprising a control area; a remote secure area including an access closure movable between open and closed positions; a power source; a locking member associated with said closure and movable between a locked condition and an unlocked condition to permit movement of said access closure into and out of its closed position; locking and unlocking circuits including electrically actuated means for driving said member between its locked and unlocked conditions; said unlocking circuit including a first switching means at said control area connected to said power source and a second switching means in series with and remotely located from said first switching means, said second switching means being keyactuated and electrically connected to said electrically actuated means for driving said locking member to its unlocked condition upon closing of said first and second switching means; holding circuit means operatively associated with said locking circuit and activated in response to movement of said locking member to said unlocked condition and movement of said access closure to an open position to condition said electrically actuated means for driving the locking member to its locked condition upon return of said access closure to said closed position; and a security switch controlling the operation of said holding circuit means and being adapted to interrupt both said locking and unlocking circuits to secure said secure area by preventing key-actuated operation of said locking member, said security switch being operatively controlled from the interior of said secure area.
Claim 2
Dependent Claim
248 words
An electrical key-actuated security locking system comprising a control area; a remote secure area including an access closure movable between open and closed positions; a power source; a locking member associated with said closure and movable between a locked condition and an unlocked condition to permit movement of said access closure into and out of its closed position; locking and unlocking circuits including electrically actuated means for driving said member between its locked and unlocked conditions; said unlocking circuit including a first switching means at said control area connected to said power source and a second switching means in series with and remotely located from said first switching means, said second switching means being keyactuated and electrically connected to said electrically actuated means for driving said locking member to its unlocked condition upon closing of said first and second switching means; holding circuit means operatively associated with said locking circuit and activated in response to movement of said locking member to said unlocked condition and movement of said access closure to an open position to condition said electrically actuated means for driving the locking member to its locked condition upon return of said access closure to said closed position; and a security switch controlling the operation of said holding circuit means and being adapted to interrupt both said locking and unlocking circuits to secure said secure area by preventing key-actuated operation of said locking member, said security switch being operatively controlled from the interior of said secure area.
Claim 3
Dependent Claim
49 words
The system of claim 1 wherein said first switching means is key-actuated and said system includes an alarm operatively connected to said first and second key-actuated switching means by said security switch upon interruption of said unlocking circuit by actuation of said security switch from within said secure area.
Claim 4
Dependent Claim
29 words
The system of claim 1 wherein said first switching means is key-actuated and said locking and unlocking circuits include separate locking and unlocking means for driving said locking member.
Claim 5
Dependent Claim
53 words
The system of claim 1 wherein the unlocking circuit includes an unlocking coil and the electrically actuated means includes a plunger operable by the coil and drivably connected to the locking member, said unlocking circuit including a closure-responsive switch for interrupting said circuit upon movement of said closure out of its closed position.
Claim 6
Dependent Claim
39 words
The system of claim 1 wherein said holding and locking circuits include a cam-operated switch responsive to the movement of the locking member into and out of its locked condition for completing and interrupting said holding and locking circuits.
Claim 7
Dependent Claim
59 words
The system of claim 5 wherein said locking circuit includes a first closure-responsive switch operative upon movement of the closure out of its closed position for activating the holding circuit and a second closure-responsive switch operative upon movement of said closure into its closed position for activating the locking circuit for driving the locking member to its locked condition.
Claim 8
Dependent Claim
29 words
The system of claim 1 including an alarm adapted to be operatively connected to said first and second switching means upon interruption of the circuits by said security switch.
Claim 9
Dependent Claim
52 words
The system of claim 1 wherein the unlocking circuit includes a bypass at the control area connected to the means for driving the locking member to its unlocked condition to permit service access to the remote secure area, said security switch being capable of interrupting said unlocking circuit to prevent service access.
Claim 10
Dependent Claim
54 words
The system of claim 1 wherein the unlocking circuit includes a bypass operatively controlled from the interior of the secure area for driving the locking member to its unlocked condition to permit access to the remote secure area, saiD security switch being capable of interrupting said unlocking circuit to prevent said bypass controlled access.
Claim 11
Dependent Claim
34 words
The system of claim 1 including an emergency bypass controlled at the control area and directly connecting the power source with unlocking circuit beyond the security switch to defeat interruption by said security switch.
Claim 12
Dependent Claim
30 words
The system of claim 1 wherein said locking member includes means controlled from within said secure area for manually moving said locking member into and out of its locked condition.
Claim 13
Dependent Claim
101 words
The system of claim 1 wherein the locking and unlocking circuits include locking and unlocking solenoid coils and the electrically actuated means includes a plunger operable by the coils and drivably connected to the locking member, said unlocking circuit including a closure responsive switch for interrupting said circuit upon movement of said closure out of its closed position, said holding circuit including a relay operable for energizing said locking coil upon return of the closure to its closed position, and an alarm operatively connected to said first and second switching means upon interruption of said unlocking circuit by said security switch.
References Cited (Backward Citations)
US2702467A
Cited
US3148525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |