Abstract: Apparatus for driving a roller-shutter door comprises a driving plate, a planetary-gearset, a stationary housing, and adjustable control means. The adjustable control means is mounted in the stationary housing for cooperating with the driving plate as well as the planetary-gearset for controlling the actuation of a motor whereby a roller-shutter door can be moved to a predetermined limit position. More especially, the adjustable control means is disposed to extend from the stationary housing such that the adjustable control means can be manually adjusted from outside of the stationary housing.

Abstract: A safety switch device for monitoring the position of a protective cover, the cover being pivotable about an axis into and out of a closed position. The safety switch device includes a fixed position switch unit which houses at least a first electrical signal generator which will be switched between states in response to movement of the protective cover from the closed position, the signal generator being operated by an actuator which rotates about an axis. The switch device also includes a fastener element which is adjustably mountable to the protective cover and an articulated mechanical coupling which extends between the fastener element and the signal generator actuator, the coupling element being movable in at least two planes.

Abstract: A device for detecting a change in the thrust load acting on the actuating rod of a linear actuator. The thrust detecting device includes a pinion which converts and enlarges an axial linear displacement of a rotating drive screw shaft caused by a change in the load on an actuating rod driven by the screw shaft into an angular displacement of a vertical shaft of the pinion. A circular scale plate is attached to the vertical shaft of the pinion and serves to indicate a preset value for the load change to be detected. A pair of striker plates each having a pointer effective to select a preset value on the circular scale plate and a striker effective to activate a corresponding limit switch are attached to the circular scale plate.

Abstract: 1. A variable delay arming timer comprisingA cylindrical housing,A motor and gearing contained within said housing,A shaft coupled to said gearing to be rotated thereby at a predetermined e, said shaft being coaxial with said cylindrical housing,Cam means mounted on said shaft for rotation therewith,Snap-action switch means carried by said housing and controlled by said cam means, said snap-action switch means having at least one spring biased actuating rod controlled between a retracted switch open position to an advanced switch-closed position by means of said cams, said rod being carried by said housing and being arranged in parallel relationship to said shaft and radially displaced from said shaft by a distance greater than the radius of said cylindrical housing, andSwitch carrying discs surrounding said cylindrical housing in coaxial relation thereto, said discs carrying switch elements in position to be actuated by said actuating rods.

Abstract: A remote lighting control for box mounted lamps which permits one or more wall switch controlled lamps to be operated on a selected time basis by creating a circuit across the normally opened wall mounted switches.