Security alarm device

Claim 2

A security alarm device mountable on a door and including a tripping lever sensitive to the movement of a door relative to a stationary door frame to detect opening and closing of the door, the device comprising an annunciating alarm circuit, a control circuit including a normally open switch closeable to actuate the annunciating alarm circuit, a manually retractable actuator spring-biased toward an operating position where it closes the switch, and first and second latch means for releasably holding said actuator in retracted positions remote from said operating position, said latch means being operatively associated with the tripping lever so as to release the actuator from the first latch means when the lever senses the door has closed and to release the actuator to said switch operating position from the second latch means when the door re-opens.

Claim 3

A security alarm device as claimed in claim 1 wherein the control circuit also includes time delay means which delay actuating the annunciating alarm circuit for a short interval of time after the switch is closed, said time delay providing an opportunity for retracting the actuator from its operating position to reopen the switch before the annunciating alarm circuit is energized.

Claim 4

A security alarm device as claimed in claim 2 having means manually operable to by-pass said time delay means so that the annunciating alarm circuit is immediately energized on closing of the switch.

Claim 5

A security alarm device as claimed in claim 1 which further includes an actuating relay for the annunciating alarm circuit and wherein the control circuit includes a capacitor which is charged on closing of the switch to energize the relay and actuate the annunciating alarm circuit.

Claim 6

A security alarm device as claimed in claim 4 wherein the control circuit fUrther includes means for delaying the charging of the capacitor upon release of the actuator to its operating position to close the switch.

Claim 7

A security alarm device as claimed in claim 5 wherein the means for delaying the charging of the capacitor comprises a resistor in series with the capacitor, the control circuit also including a manually operable switch for by-passing the resistor to permit rapid charging of the capacitor and immediate actuation of the alarm circuit on closing of the first-mentioned normally open switch.

Claim 8

A security alarm device as claimed in claim 5 wherein the control circuit further includes manually operable by-pass means for said capacitor-charging-delay means which when operated permit the alarm circuit to be actuated immediately upon closing of the control circuit switch.

Claim 9

A security alarm device as claimed in claim 4 further including a key-operated disarming switch for interrupting the alarm circuit.

Claim 10

A security alarm device as claimed in claim 8 including a further switch positioned to be closed by the tripping lever whenever it senses the door is open, said switch comprising a circuit coupled to the relay by the disarming switch when it is positioned to interrupt the alarm circuit, the coupled relay causing a buzzing sound to be emitted when the further switch is closed.

Claim 11

A security alarm device as claimed in claim 8 which further includes indicia means actuated by the disarming switch when in its alarm circuit interrupting position.

Claim 12

A security alarm device as claimed in claim 1 which also includes a normally open thermostatic switch connected to the alarm circuit to annunciate the same when closed.

Claim 13

A security alarm device as claimed in claim 11 wherein the thermostatic switch is so coupled to the alarm circuit that it annunciates differently when the thermostatic switch closes that when it is actuated by the relay.

Claim 14

A security alarm device mountable on a door to announce the opening thereof, the device comprising alarm means, an actuatable circuit therefor, switch means for actuating the circuit, a spring-biased retractable actuator for operating said switch means, and a rotatably-mounted, spring-biased detecting lever which engages the door frame when the door is closed and is biased to an operating position when the door is opened, a first catcher spaced from the switch means and overlying the actuator, the actuator having catch means to catch with the first catcher when the actuator is retracted from engagement with the switch means, a second catcher disposed between said first catcher and the switch means, said second catcher being spring-biased toward the actuator and including a projection past which the catch means of the actuator moves when retracted to catch with the first catcher, the detecting lever including a portion which overrides a portion of said second catcher to hold the projection thereof spaced above the actuator when the lever is spring-biased to its operating position, and spring means biasing the second catcher toward the actuator to dislodge its catch means from the first catcher when the lever is rotated back out of its operating position as with closing of the door, the projection of the second catcher being located to catch and hold the catch means of the actuator when thus released from the first catcher until the lever is again swung to its operating position with reopening of the door, the catch means of the actuator thereupon being dislodged to permit the actuator to return to its switch means operating position to actuate the alarm means.

Claim 15

A security alarm device mountable on a door to announce the opening thereof, the device comprising alarm means, an actuatable circuit therefor, switch means for actuating the circuit, a spring-biased retractable actuator for operating said switch means, and a rotatably-mounted, spring-biased detecting lever which engages the door frame when the door is closed and is biased to an operating position when the door is opened, a first catcher spaced from the switch means and overlying the actuator, the actuator having catch means to catch with the first catcher when the actuator is retracted from engagement with the switch means, a second catcher disposed between said first catcher and the switch means, said second catcher being spring-biased toward the actuator and including a projection past which the catch means of the actuator moves when retracted to catch with the first catcher, the detecting lever including a portion which overrides a portion of said second catcher to hold the projection thereof spaced above the actuator when the lever is spring-biased to its operating position, and spring means biasing the second catcher toward the actuator to dislodge its catch means from the first catcher when the lever is rotated back out of its operating position as with closing of the door, the projection of the second catcher being located to catch and hold the catch means of the actuator when thus released from the first catcher until the lever is again swung to its operating position with reopening of the door, the catch means of the actuator thereupon being dislodged to permit the actuator to return to its switch means operating position to actuate the alarm means.

Claim 16

A security alarm device as claimed in claim 13, wherein the circuit for the alarm means includes an energizable relay, a capacitor connected to the relay to energize the relay when charged, and a control circuit including said capacitor and the mentioned switch means which is normally open, said control circuit being adapted to charge the capacitor when the switch means is closed by the actuator.

Claim 17

A security Alarm device as claimed in claim 14 wherein the control circuit also includes a resistor in series with the capacitor to delay its charging as when the switch means is initially closed with reopening of the door, and a manually operated second switch for shorting said resistor to permit rapid charging of the capacitor and thereby immediate actuation of the alarm means upon opening of the door.

Claim 18

A security alarm device as claimed in claim 15 wherein the circuit for the alarm means includes a disarming switch operable to interrupt the alarm once initiated by the control circuit.

Claim 19

A security alarm device as claimed in claim 16 comprising a further circuit including a fourth switch closed by the detecting lever in its operating position, said further circuit including buzzer means energized by the closing of said fourth switch, said further circuit being activated by the disarming switch when operated to interrupt the alarm.

Claim 20

A security alarm device as claimed in claim 17 wherein the disarming switch has visual indicia means associated therewith to indicate when the disarming switch is in position to interrupt the alarm.

Claim 21

A security alarm device as claimed in claim 16 wherein the disarming switch is key-actuated.