Abstract: A vandalism-proof lever handle system for activating a locking or latching device has a U-shaped lever handle having first and second bent end portions with a central or intermediate portion therebetween. A second end portion is secured to a mounting surface and has an extended portion for engaging the lock or latching device for activating the same. The opposite first end portion is movably secured to move in an arc-like path within a curved retaining channel forming an arc segment of given arc length. The first end portion is entrained preferably by a shoulder bolt or collar having a widened end portion. The widened end portion or widened portion of the shoulder bolt is received in an interior of the channel. End portions of the retaining channel form abutments or stop points which limit further movement during rotation of the lever handle. The shoulder bolt or widened collarlike element limits rotational, lateral, vertical, and inward and outward forces placed on the lever handle.

Abstract: A tube bender has multiple rotatable bend dies of differing radii and a pressure die engaging the outer surface of the trailing portion of the tube tangential to the bend. A drive for the pressure die is provided to move the pressure die parallel to the tangential tube portion during bending. The drive includes sensors for determining both the drive speed of the pressure die and the rotation rate of the bend die, a computer which converts the detected rotation rate into a center line speed for the tube, and a servomechanism which controls the drive structure so as to drive the pressure die at a speed which has a selected ratio to the tube center line speed.

Abstract: A method and apparatus for automatic rear loading of mandrel type tube benders. The bender includes a base, bending head at the forward end of the base, carriage for positioning a tube with respect to the bending head, and a mandrel rod supporting on its front end near the bending head a mandrel. The improvement includes the use of two separate clamps for gripping the mandrel rod with respect to the base, one clamp being located near the rear end of the mandrel rod and the other clamp at an intermediate point on the mandrel rod spaced from the first clamp a distance at least equal to the length of the tubes to be bent. The clamps selectively grasp the mandrel rod, at least one clamp grasping the rod at any given time, to allow a tube to be loaded onto the mandrel rod while another tube is being bent.

Abstract: Apparatus for producing digital signals signifying the angular position in each revolution and the number of revolutions of a shaft which rotates a plurality of times. The apparatus includes two rotary position transducers which are coupled to each other and to the shaft. Both of these transducers rotate a plurality of times in response to the rotations of the shaft, one of the transducers rotating at a different speed than the other. Each transducer produces signals which are individual to the respective transducer and are the same for each rotation of the respective transducer.