Device for actuating a warning device in combination with a lock for a door, window or the like

Claim 1

In combination with a lock of a door, window and the like having a lock plunger bolt extendable from an edge of a panel of the door or window for projecting into a corresponding securing plate of a frame of the door or window for locking same when in a closed condition, and a warning device which includes an electric circuit for actuating an alarm, an apparatus for actuating the electric circuit of the warning device upon any relative displacement between the door or window and its frame not accompanied by withdrawing of the lock plunger bolt, comprising: a touch pin mounted in the frame opposite the edge of the panel and movable toward and away from the panel edge, the touch pin having a tip; a first spring biasing the touch pin toward the panel edge so as to cause the touch pin to extend from the frame for contacting the panel edge when the panel is in a closed position in the frame, whereby the touch pin movably follows the relative movement between the panel edge and a fixed point of the frame; a contact plate fastened on the touch pin and movable therewith; catch means pivotally mounted to the frame and pivotable between a catching position and a releasing position, the catch means being in the form of an arm one end of which is engagable by the projecting lock plunger bolt when the lock is locked, the arm having another end which contacts an edge of the contact plate when the one end of the arm is not engaged by the lock plunger bolt; a second spring biasing the catch means against the force of the first spring and towards the lock plunger bolt so as, when the one end of the catch means arm is not engaged by the projecting lock plunger bolt, to urge the catch means toward the catching position thereof to cause the other end of the catch means arm to engage the contact plate and to catch the touch pin in a retracted position with the tip of the touch pin held away from the panel edge; and a contactor mounted on the frame adjacent the touch pin, the contactor having a pair of terminals connected into the warning device actuating circuit which pair of terminals when contacted by the contact plate fastened to the touch pin, complete the warning device actuating circuit; whereby when the lock is locked the projecting lock plunger bolt engages the catch means so as to place the catch means in its said releasing position with the touch pin tip just contacting the panel edge, so that the contact plate is held spaced apart from the terminals of the contactor, and whereby any relative displacement of the panel edge and the frame which causes an increase in the distance between the fixed point of the frame and the corresponding point on the panel edge will cause the touch pin, under the urging of the first spring, to move toward the panel edge and to cause the contact plate to contact the terminals of the contactor for completing the warning device actuation circuit.