Abstract: Hybrid stretching and exercising machine. The machine comprises first and second elongate track members having proximal and distal ends ranged in a co-linear fashion. First and second foot-receiving members are slidably and rotatably mounted upon respective ones of the track members, and are further inwardly biased toward the respective proximal ends thereof. Preferably, the degree of bias may be selectively controlled. In use, the user is able to rapidly stretch and strengthen the muscles of both right and left legs by merely twisting about the device by approximately 180°. The device further preferably includes a handle member to provide support during use of the device, and may be further adapted to enable the user to perform rowing, curl, and abdominal-strengthening type exercises.

Abstract: A circuit breaker lighting panelboard is adapted for both top and bottom feed connections with no field modification requirements. The panelboard interior accepts a variety of branch circuit breaker mounting arrangements and the mounting rails are interconnected by steel straps to reduce shipment damage.

Abstract: High by-pass fan jet engine includes counterrotating turbine blade sets for receiving hot combustion gases from a core engine portion and driving the fan blades through a planetary gear-type reduction gear assembly. Lightweight, highspeed, concentric, counterrotating shafts transmit power from both turbine blade sets to the fan via the reduction gear assembly. A pair of planetary gear assemblies with fixed fing gears and a rotatable common planetary gear carrier is used to drive a single set of fan blades via the carrier, and a pair of planetary gear assemblies with a fixed common planetary gear carrier and rotatable ring gears is used to drive two or more counterrotating fan blade sets via the ring gears. A low pressure "booster" compressor feeding the core engine portion can be directly driven from one of the two high speed shafts.

Abstract: A high bypass ratio turbofan engine having a fan section, a booster compressor disposed aft of the fan section relative to the flow of combustion gases through the engine, and a core section disposed aft of the booster compressor. A low pressure counterrotating turbine, disposed aft of the core section, is used for driving the fan section and the booster compressor. The counterrotating turbine includes at least one set of rotating turbine blades and at least one set of oppositely rotating counterrotating turbine blades. A twin spool shaft is provided for coupling the turbine blades to the booster compressor and for coupling the counterrotating turbine blades to the fan section. A reduction gear is disposed in the drive shaft for coupling the turbine blades to the fan section and for reducing the rotational speed of the turbine output power to match the rotational speed of the fan section thereby splitting the usable work of the turbine blades between the fan section and the booster.

Abstract: An engine block is provided including multiple cylinders having pistons reciprocal therein connected to separate crankshaft sections journalled from the block by connecting rods. The block also journals a countershaft to whose opposite ends the crankshaft sections are drivingly connected through the utilization of power transmitting assemblies each including a clutch assembly and releasable drive connection structure incorporating and indexing mechanism for indexing the corresponding shaft section to the countershaft in the same indexed position each time the corresponding clutch assembly is actuated. The clutch assembly of each power transmitting assembly is interposed, in the path of transmission of power from the corresponding crankshaft section to said countershaft, intermediate the crankshaft section and the corresponding drive connection structure.