US3837192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lock for emergency exit door
Assignee: Individual
•
Filing: 1972-12-19
•
Granted: 1974-09-24
•
Expires: 1992-12-19
Abstract
Abstract A lock for an emergency exit door has an electromagnet with a movable core for actuating a bolt which cooperates with a striker box. When the electromagnet is energized the bolt is held in firm engagement with the striker box and the bolt remains in this position after an interruption of the current to keep the door closed, but the force urging the bolt against the striker box is cancelled so that the door may be opened by exerting a small pressure against the door.
Inventors
- 👤 J Arouete
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:26
CPC Classifications
E; E05; E05B; E05B47/00; E05B47/02; E05B47/026; E05B47/0001; E05B47/0002; E05B65/00; E05B65/10; E05B65/108; E05B47/0003; E05B47/0004; E05B65/1006; E05C; E05C7/00; E05C7/04; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0801; Y10T292/0834; Y10T292/0836; Y10T292/0838; Y10T292/096; Y10T292/1014; Y10T292/1021; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5159; Y10T70/80; Y10T70/8027; Y10T70/827
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
129 words
A lock in combination with an emergency exit door, and a door frame said lock comprising: a. an electromagnet having a core movable between an extended and a retracted position and an energizing circuit, b. a bolt carrying a roller rotatably mounted at the free end of said bolt, c. a striker box against which the bolt is positively pressed by said extended movable core when said electromagnet is energized, said striker box having two oppositely inclined surfaces along which said roller rolls when said door is opened or closed and d. an intermediate member operatively connecting said movable core to said bolt, said intermediate member being adapted to move said core from said extended position to said retracted position when said door is opened with said electromagnet energized.
Claim 2
Dependent Claim
129 words
A lock in combination with an emergency exit door, and a door frame said lock comprising: a. an electromagnet having a core movable between an extended and a retracted position and an energizing circuit, b. a bolt carrying a roller rotatably mounted at the free end of said bolt, c. a striker box against which the bolt is positively pressed by said extended movable core when said electromagnet is energized, said striker box having two oppositely inclined surfaces along which said roller rolls when said door is opened or closed and d. an intermediate member operatively connecting said movable core to said bolt, said intermediate member being adapted to move said core from said extended position to said retracted position when said door is opened with said electromagnet energized.
Claim 3
Dependent Claim
51 words
A lock according to claim 1, wherein said intermediate member is a pivotably mounted bell crank pivotably connected at one end to said core and cooperating at its other end with said bolt and wherein the longitudinal axis of said bolt is offset from the pivotal mounting of said bell crank.
Claim 4
Dependent Claim
42 words
A lock according to claim 1, including a conventional mechanical lock and a switch, wherein said conventional mechanical lock comprises a bolt cooperating with said switch and wherein said switch is arranged in the circuit of said electromagnet and in series therewith.
Claim 5
Dependent Claim
47 words
A lock according to claim 1, including a stop and a change over switch which are provided on said door, said stop being adapted to actuate said change-over switch when said door is closed, said switch being located in the circuit of said electromagnet in series therewith.
Claim 6
Dependent Claim
25 words
A lock according to claim 1, wherein an ammeter is located in the circuit of said electromagnet in a control room remote from said lock.
Claim 7
Dependent Claim
34 words
A lock according to claim 2 wherein the bell crank has two arms of different lengths, the longer arm being pivotably connected to said movable core and the short arm cooperating with said bolt.
Claim 8
Dependent Claim
42 words
A lock according to claim 1, wherein the electromagnet with said movable core, said intermediate member and said bolt with said roller are mounted in a housing fixed to said door frame and wherein said striker box is fixed to said door.
Claim 9
Dependent Claim
74 words
A lock according to claim 7, including link means, two bell cranks, two bolts, a second striker box and wherein said door is a double door having two leaves wherein said movable core is connected to said link means which is pivoted to said two bell cranks, each of said bell cranks cooperating with said bolts, each bolt cooperating in turn with said striker box fixed to said one leaf of a double door.
Claim 10
Dependent Claim
73 words
A lock according to claim 1, including two intermediate members, upper and lower bolts, upper and lower striker boxes and a conventional mechanical lock having a bolt wherein the core of said electromagnet is connected to said two intermediate members adapted to actuate said upper and lower bolts which are to be pressed against said upper and lower striker boxes, respectively, and said bolt is adapted to actuate the core of said electromagnet.
Claim 11
Dependent Claim
66 words
A lock according to claim 6, wherein the striker box fixed to the door comprises an angle piece being mounted with one arm on the door, and a part having upwardly converging side surfaces fixed by means of two screws extending through an elongated slot in the said other arm of said angle piece, the slot having a length greater than the distance between the screws.
Claim 12
Dependent Claim
55 words
A lock according to claim 10, including a vertical rod, a lower bolt and a striker box having two slopes and fixed to the floor wherein the bolt has a downwardly extending projection for engagement with said vertical rod extending along the door and bearing against said lower bolt which cooperates with said striker box.
Claim 13
Dependent Claim
35 words
A lock according to claim 1, characterized in that an acoustic alarm is provided in the circuit and that the alarm is adapted to be energized when the current supply to the electromagnet is interrupted.
Claim 14
Dependent Claim
30 words
A lock according to claim 11, characterized in that a second acoustic alarm and a control light are located in the circuit remote from the door in a control room.
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |