Abstract: According to the invention, there is disclosed a leg stretching device 10 characterized by a leg support arm 34 mounted to a primary shaft 36 at a first end, the leg support arm having a leg support 38 secured to the leg support arm at a second end; and structure for rotating the primary shaft from an initial position to a final position so that the leg support arm moves through a range of about 30 to 70 degrees and preferably about 40 to 60 degrees. In addition, there are provided structure for adjusting the location of the initial position of the leg support arm 34. In addition, the length of leg support arm 34 is adjustable.

Abstract: An exercising device is described that permits exercising the arms and/or legs of a person, such as a wheelchair-bound person. The device has a drive shaft to which foot pedals are mounted. The foot pedals are mounted off of the axis of rotation and at an angle to the axis of rotation such that when a person's feet are strapped to the foot pedals and the drive shaft is rotated, the feet will circle the axis of rotation and will cause circular motion of the ankles. Arm exercising members are attached to the drive shaft will cause an oscillatory pivotal motion of the arm exercising members.

Abstract: A cooling system that has an electrical controller that controls an electric expansion valve and the defrost cycle using a reversing valve. The need for heater circuit to achieve defrost is eliminated. The system permits the defrosting the evaporator system in less time required for conventional defrost methods. The cooling system also eliminates the need for a head pressure control valve and check valves. Due to the less wiring and lower operating costs, the invention provides significant cost savings.

Abstract: A head unit in an automotive audio system has a master microprocessor connected to a bus for serial additional of modules for expanding the system. The bus is continuous through each module, and provides both inputs and outputs to and from the head unit. Modules may include an RF remote control module, an RF headphones module, and an A/V source selector which permits rear seat occupants to choose and control a video source such as a VCR or a game.

Abstract: An output transformer, especially useful to couple a balanced output stage to an unbalanced load, employs first and second primary winding halves, which have their "center taps" physically offset, and wherein the windings are wound coextensively for some but not all of their length. The secondary winding is wound coextensively with one or the other of the two primary halves, thereby improving the coupling and reducing leakage inductance and also reducing the interlayer volt amperes and thus reducing interlayer capacitance.

Abstract: A power actuator for rotating and reversing a high power radio frequency switch is disclosed. The actuator uses a motor drive and a delay cam means to enable the transmitter's interlock switches to be opened or closed before the radio frequency switch is rotated. A manual drive means is provided to manually rotate the radio frequency switch and the interlock switches if desired. The delay cam includes a first cam means mounted on the shaft which drives the radio frequency switch. A second cam means which rotates freely on the same shaft is driven by a remotely controlled motor. The two cams are engaged, in the first embodiment, by an elongated pin which is fixed in the second cam and extends through an arcuate slot in the first cam. In the second embodiment, the arcuate slot cam means is replaced by a single pin which extends transversely through the first cam means drive shaft. This pin alternately engages at 90.degree.

Abstract: A switch system for interconnecting a plurality of balanced line inputs with a plurality of balanced line outputs is disclosed. The lines are crossed in a matrix with a pair of rotatable switch means mounted at each crosspoint. Each pair of the switch means provides straight through connections for the input and output lines while in a first position, and a cross connection at the matrix point while in a second position. The switch means provides identical path lengths for each side of the balanced line before and after switching. The switch system also includes means for grounding the unused contacts and the inactive line sections remaining in the matrix after an interconnection has been made. The matrix is formed of a plurality of interchangeable modules that allow quick and convenient expansion of the matrix when needed.