Abstract: When an elevator is running, the car door 27 is locked in the closed position by a brake shoe 12 which engages the edge of the door hanger 24 in response to a push-type solenoid 19 overcoming the force of a spring. When the door is not closed, a friction brake pad 11 contacts the door hanger surface to hold the door open for passenger boarding or to stop the door in case of failure of door operator power while the door is in motion.

Abstract: The door or doors of an elevator are driven through their opening and closing cycles by one or more linear induction motor (LIM) assemblies in which the primary winding component of the LIM assembly is secured to the elevator cab structure and the LIM secondary component is secured to the cab door. If the cab has two oppositely moving doors, there will preferably be two separate motor drives, one for each door. In one embodiment, the motor components are arranged so as to create a normal force which is horizontal; and in another embodiment, the normal force created is vertical. A primary motor mount bracket is used which secures the primary winding component to the overhead component of the cab structure.

Abstract: A gripper and mandrel assembly for a tube bender, particularly a bender of the stretch type. At least two gripper jaws close about an end of a tubular workpiece when actuated by the cone portion of a slideable shaft. The same shaft has a cable and ball type mandrel extending outwardly from its distal end. During a stroke of the shaft from the DISENGAGE to the ENGAGE position of the assembly, the shaft both drives the mandrel into the workpiece and also causes the jaws to close about the end of the tube. When in the ENGAGE position, the distal end of the shaft is inside the tube in order to prevent the gripper jaws from deforming or otherwise causing excessive damage to the workpiece end. An abrasive coating partially covers the inner surface of the recess of the gripper jaw that contacts the outer wall of the workpiece in order to insure a firm grasp of the workpiece by the gripper jaws. A tube bender would have at least two assemblies, one to grasp each end of a tubular workpiece.