Abstract: An air-controlled differential rewind mandrel for simultaneously winding multiples of web material (slit strips) mounted onto cores in rewind machines having two or more rewind mandrels, means for providing constant torque to each rewind roll formed by the individual slit strips, core engaging shoes formed in arcuate segments positioned around the mandrel, the segments being formed with elongated arcuate outer surfaces having extended purchase contact with the tape winding cores for a substantial part, such as 180 degrees, per rotation of the mandrel, with the inner surfaces of the cores, each shoe being differentially movable relatively to the others as required by tension conditions encountered, and in any desired numerical groupings, and adjustable positional means engageable with the shoes, obviating the necessity for complex adjustment and down time heretofore required to conform to the positions of cores of different widths on the mandrel, and various torque requirements encountered in practise.

Abstract: An area intrusion adjustable detector unit having transmitting and receiving transducers which may be accurately aimed and pointed to areas to be monitored without changing the position of or moving the unit. The unit may be in single transmitter-receiver form, or (as for monitoring two separate and distinct areas or rooms) may have two separately mounted and adjustable transmitter-receiver sets, each set adapted to be adjusted for precision aiming independently of the other set for different target areas, without changing the position of the unit. In addition to the transducer aiming features, the unit is adjustable as to regions of air turbulence caused by baseboard radiators, space heaters, fans, etc. resulting in air motion, door, windows and walls vibrating when traffic passes, moving objects such as household pets, and hanging objects that sway, creating misleading doppler shifts of the range that would be caused by a human intruder.

Abstract: An air-controlled differential rewind mandrel for simultaneously winding multiples of web material (referred to hereinafter as slit strips) mounted onto cores provided in slitting and rewind machines with two or more rewind mandrels, and means for providing constant torque to each rewinding roll formed by the individual slit strips.