Abstract: A door lock has a frame in which a knob spindle is mounted for rotation about an axis. The spindle can be prevented from rotation on the frame by a bar movable along the axis into and out of a position in which the bar engages both the frame and a slot in the spindle. The bar is moved by a spring and by a manual button mounted in an inside knob on the frame. The spindle can also be prevented from rotation on the frame by a pin radially movable on the frame into and out of a position in which the pin engages both the frame and the spindle slot. The pin is moved by a spring and by an arcuate electromagnet disposed coaxially of the spindle and having a polepiece in position to influence an armature on the pin. The customary key-operated lock is installed in an outer knob fastened onto the spindle.

Abstract: A door lock condition indicator includes a lock frame adapted to be mounted on a door panel. Outer and inner spindles carrying knobs and rotatable about an axis are mounted on the lock frame to actuate a lock mechanism. A locking bar is disposed partly in the lock frame and partly in the inner spindle and is movable parallel to the axis between one position in engagement with the lock frame and free of the outer spindle and another position in engagement with the lock frame and engaging the outer spindle to prevent the lock mechanism from being actuated thereby. There is an electric switch included in an indicator circuit and disposed on the lock frame in a position to be engaged by the locking bar and actuated to close the circuit when the locking bar is in a selected one of the positions.