Abstract: A plug-fastener for safety belts in motor vehicles, which comprises a tongue-like plug part and a receiving part for receiving and retaining the tongue-like plug part. The plug part is provided with at least one recess, undercut, or a shoulder. The receiving part comprises at least one locking member which engages the recess, undercut or shoulder of the plug part, and, after the plug part has been received by the receiving part, is operable to retain these parts until the parts are separated deliberately. In the receiving part in the path of movement of the plug part there is movably arranged a holding member one end or extension of which is adapted to engage the locking member in its unlocked position and to prevent the latter from moving into its locking position until the plug part has contacted the holding member and has moved it out of engagement with the locking member.

Abstract: A mechanism for inhibiting the locking movement of a hooklike oven door latch member when an associated keeper fixed to the oven door is not in its proper position for engagement with the latch member. Inhibiting the locking movement of the latch member precludes the closing of associated interlock switches to prevent the user from initiating a high temperature oven cleaning cycle or a microwave cooking cycle without proper locking of the oven door. The mechanism includes a stop member biased at a latch movement inhibiting position, the stop member being moved to a non-inhibiting position by engagement with the keeper when the oven door is moved to a fully closed position.

Abstract: A safety lock for securing a radiation source in a radiography exposure device is disclosed. The safety lock prevents the inadvertent extension of the radiation source from the exposure device. The exposure devices are used extensively in industry for nondestructive testing of metal materials for defect. Unnecessary exposure of the radiographer or operator occurs not infrequently due to operator's error in believing that the radiation source is secured in the exposure device when, in fact, it is not. The present invention solves this problem of unnecessary exposure by releasingly trapping the radiation source in the shield of the radiography exposure device each time the source is retracted therein so that it is not inadvertently extended therefrom without the operator resetting the safety lock, thereby releasing the radiation source. Further, the safety lock includes an indicator which indicates when the source is trapped in the exposure device and also when it is untrapped.

Abstract: Disclosed is a locking device for locking a door and the like, suitable for use in an electric locking system. The device has a dead bolt which is held in a retracted position within a housing when the door is open, and an actuating member adapted to be partially projected out of the housing when the door is open. The actuating member is slidably mounted in the housing and has an inclined surface acting as a cam surface for engagement with the end surface of the door. The actuating member is so inter-related with the dead bolt that the latter is driven into a corresponding hole in the door jam as the slidable member is depressed by the door, in the course of closing of the door. An electromagnetic plunger is provided for allowing the retraction of the dead bolt in accordance with a predetermined specific electric signal. A manually operative member is associated with the electromagnetic plunger to allow a manual unlocking if necessary.

Abstract: An electrically operated multiple security bolt door locking device which serves to enhance the inherent strength of a door being so controlled and thereby providing maximum resistence to forceful entry. To this end a plurality of reinforced security bolts are provided in sufficient number thereof and disposed, preferrably externally, on wall immediately adjacent to said door and decoratively covered. Said bolt plurality is normally biased locked and electrically withdrawn, in concert, from locked position and retained in unlocked position while door is open. Said security bolt plurality is employed horizontally along a line juxtaposed with said wall and door.

Abstract: A self-latching flush bolt for use in the inactive door of a pair of swinging doors, the bolt being on a slide rod which is spring actuated to throw the bolt into engagement with the strike when the trigger is contacted by the active door. A dead-locking lever holds the bolt locked as long as the trigger is depressed; when the active door is opened the bolt may be manually retracted and will be held in retracted position until the trigger is activated. A roller on the bottom bolt rolls on the floor in case the bolt is thrown with the door in an open position.

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.