Patent US3751088A successfully refreshed from Google Patents.
US3751088A
Expired / Lapsed
US
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Electromagnetic lock
Assignee: Schlage Lock Co LLC
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Filing: 1971-05-24
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Granted: 1973-08-07
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Expires: 1991-05-24
Abstract
Abstract An electromagnetic lock has a frame on one of two relatively movable door members and a strike on the other of the door members. A bolt horizontally pivoted on the frame is withdrawn by gravity and impelled under manual control into projected, strikeengaging position by a first electromagnet effective only when a magnetically responsive switch on one door member and a magnet on the other door member are in proximity. The bolt is held in projected position by a detent withdrawable against gravity by a second electromagnet under manual control. Mechanical operation is also provided, and indicators and alarms show relative position of the lock parts.
Inventors
- 👤 E Schlage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:06
CPC Classifications
E; E05; E05B; E05B47/00; E05B47/02; E05B47/023; E05B47/0001; E05B47/0002; E05B47/06; E05B47/0607; E05B15/00; E05B15/0093; E05B2047/0007; E05B2047/0008; E05B2047/0084; E05B2047/0088; E05B47/0003; E05B47/0004; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/1043; Y10T292/1063; Y10T292/1064; Y10T292/1066; Y10T292/1067; Y10T292/1075; Y10T292/1082; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5372; Y10T70/70; Y10T70/7051; Y10T70/7062; Y10T70/7107; Y10T70/7119
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
245 words
An electromagnetic lock for use on relatively movable door members comprising a frame adapted to be mounted on one of said members; a strike adapted to be mounted on the other of said members; a bolt; means for guiding said bolt on said frame to move between a first position substantially within said frame and a second position projecting from said frame to engage said strike; a first electromagnet mounted on said frame; a first armature movably disposed with respect to said first electromagnet; means for connecting said bolt and said first armature for conjoint movement; means for urging said bolt toward one of said positions; a detent lever; means for guiding said detent lever on said frame for movement between a first location in latching engagement with said bolt when said bolt is in said second position and a second location out of engagement with said bolt; a second electromagnet mounted on said frame; a second armature movably disposed with respect to said second electromagnet; means for connecting said second armature and said detent lever for conjoint movement; means for urging said detent toward one of said positions; means for selectively energizing said electromagnets including a first electrical circuit incorporating said first electromagnet; a magnetically responsive, normally open switch controlling said first circuit and disposed on one of said members; and a magnet disposed on the other of said members effective to close said switch only when said members are close to each other.
Claim 2
Dependent Claim
245 words
An electromagnetic lock for use on relatively movable door members comprising a frame adapted to be mounted on one of said members; a strike adapted to be mounted on the other of said members; a bolt; means for guiding said bolt on said frame to move between a first position substantially within said frame and a second position projecting from said frame to engage said strike; a first electromagnet mounted on said frame; a first armature movably disposed with respect to said first electromagnet; means for connecting said bolt and said first armature for conjoint movement; means for urging said bolt toward one of said positions; a detent lever; means for guiding said detent lever on said frame for movement between a first location in latching engagement with said bolt when said bolt is in said second position and a second location out of engagement with said bolt; a second electromagnet mounted on said frame; a second armature movably disposed with respect to said second electromagnet; means for connecting said second armature and said detent lever for conjoint movement; means for urging said detent toward one of said positions; means for selectively energizing said electromagnets including a first electrical circuit incorporating said first electromagnet; a magnetically responsive, normally open switch controlling said first circuit and disposed on one of said members; and a magnet disposed on the other of said members effective to close said switch only when said members are close to each other.
Claim 3
Dependent Claim
241 words
A lock for use on relatively moving door members comprising a frame adapted to be mounted on one of said members, a strike adapted to be mounted on the other of said members, a bolt, means for guiding said bolt on said frame to move between a first position substantially within said frame and a second position projecting from said frame to engage said strike, means for urging said bolt toward one of said positions, a detent lever, means for guiding said detent lever on said frame for movement between a first location in latching engagement with said bolt when said bolt is in said second position and a seconD location out of engagement with said bolt, means for urging said detent lever toward one of said locations, operating means movable between a first position and a second position, means controlled by said operating means for moving said bolt against the force of said urging means from one of said positions toward the other of said positions and for moving said detent lever against the force of said urging means from one of said locations toward the other of said locations, and means responsive to the relative position of said members and including one part on one of said members and including another part on the other of said members and spaced from said one part in all positions of said members for controlling the effectiveness of said bolt urging means.
Claim 4
Dependent Claim
241 words
A lock for use on relatively moving door members comprising a frame adapted to be mounted on one of said members, a strike adapted to be mounted on the other of said members, a bolt, means for guiding said bolt on said frame to move between a first position substantially within said frame and a second position projecting from said frame to engage said strike, means for urging said bolt toward one of said positions, a detent lever, means for guiding said detent lever on said frame for movement between a first location in latching engagement with said bolt when said bolt is in said second position and a seconD location out of engagement with said bolt, means for urging said detent lever toward one of said locations, operating means movable between a first position and a second position, means controlled by said operating means for moving said bolt against the force of said urging means from one of said positions toward the other of said positions and for moving said detent lever against the force of said urging means from one of said locations toward the other of said locations, and means responsive to the relative position of said members and including one part on one of said members and including another part on the other of said members and spaced from said one part in all positions of said members for controlling the effectiveness of said bolt urging means.
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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 |