Abstract: A cartridge mounted in a sleeve on the exterior of a motor vehicle door receives a planar card having raised, conductive indicia for completing an electric circuit on a plate forming a part of the cartridge. The circuit energizes a solenoid attached to an interior door handle of the vehicle for rotating the handle to unlock the door when the vehicle keys have been lost, misplaced or inadvertently left in the ignition, and the doors of the vehicle have been locked.

Abstract: A safety lock for a centrifuge prevents the opening of the rotor housing if the rotor is in operation and conversely prevents the rotor from being operated if the rotor housing is not latched and locked. A plunger linked to a cam follower is used to lock a door latch and to sense its latched or unlatched condition. The position of the cam follower and hence of the plunger is sensed by plural switches. The cam follower is biased by a spring to normally urge the plunger into a locking position with the latch. A drive cam, actuated under the control of the plural switches, withdraws the plunger to unlock the latch and releases the cam follower to permit the plunger to snap into a locking position.

Abstract: A fastening device for securing articles together, the device including releasably connected male and female components. The male component comprises a pin and the female component comprises a retaining insert positioned in a housing for releasably clamping the pin. When joined, the pin can not be separated from the retainer except by a special tool. The insert is of magnetic material, and an actuating tool including an electromagnet is employed to actuate the insert to permit removal of the pin. The housed insert is attached to a tag, with the tag being attached to the article which is to be sold. The tag houses an electrical circuit which activates an alarm if the tag is not properly removed at the checkout point by means of the special tool.

Abstract: A locking pin for a garage door is moved longitudinally in a bushing between a door frame and a movable door by an electric motor linked to the pin. The motor is selectively actuated in one direction by a radio receiver relay or a key switch. The motor moves the pin to its unlocked position and switches signal lamps from red to green. To lock the door again, a second radio signal or switching of the key switch opens a motor switch and a biasing spring in the motor returns the pin to its locking position.

Abstract: An apparatus for unlatching a door to a hygienic area actuated by sensor electrodes in contact with the electrolytic residue of a cleansing agent upon the hand or limb of a person desiring access to the hygienic area.

Abstract: A radio-operated lock construction is adapted to be mounted on a door and is positioned to engage a mating piece mounted on the adjacent door jamb to lock the door in the closed position. The lock comprises a lock housing having means for mounting the housing on the door. A drop bolt is movably mounted on the housing for movement between an extended position wherein the bolt engages with the mating piece and a retracted position wherein the bolt and mating piece are disengaged. The drop bolt comprises an operating member which is movable from a first position corresponding to the extended position of the bolt to a second position corresponding to the retracted position of the bolt. An opening slide is connected with the operating member and is movable upon actuation from a first to a second position to move the operate member from the first to the second position thereby retracting the drop bolt.