Abstract: A lock, particularly well suited for use with a safe which includes a movable door latch mechanism having a lock bolt abutment surface. The lock has a casing having a bolt-receiving aperture in one of its walls. The casing is to be mounted to the door, for example, on the inside surface of the door with the bolt-receiving aperture adjacent the bolt-abutment surface of the door latch mechanism. A bolt is slidably mounted in the casing for movement at an angle relative to the bolt abutment surface of the door latch mechanism between a locked position projecting through the aperture in the casing and into abutment with the abutment surface of the door latch mechanism and an unlocked position out of abutment with the abutment surface of the door latch mechanism and retracted into the casing.

Abstract: A slidebolt lock, with slidebolt displacement forces provided by a mechanism outside the lock assembly and acting on the slidebolt, is locked by a blocking member carried by the slidebolt and normally spring biased toward a blocking and locking position. The blocking member engages the lock case and denies the bolt freedom to move in an unlocking direction. The blocking member is forced to a disengaged position by an electromechanical drive, such as a stepper motor driving a cam wheel and cam follower, or a solenoid directly or indirectly acting to force the blocking member to a position within the bolt and disengaging the blocking member from engagement with the lock casing. To simplify the solenoid in one embodiment, upon slidebolt movement toward a withdrawn, unlocked position, the blocking member forms and provides a camming structure to break any residual magnetic seal of the solenoid armature to the solenoid body.

Abstract: A portable sand mold metal treating system having sand cope and sand drag portions, the treating system being attachable to a sand mold metal casting system.