Abstract: A knee crutch for use by a user having an ailing hip on one side of the user's body. The device includes a knee engaging member releasably attachable against and spanning and receiving support from the user's knee. The knee engaging member includes a hand hold at an upper end thereof and positioned just above the knee whereby, when the user grips the hand hold and applies downward pressure thereto, a substantial amount of body weight force applied to the user's leg while standing or walking and is transferred away from an ailing hip to the arm and shoulder of the user, thereby substantially reducing body weight force applied to the ailing hip and pain associated therewith.

Abstract: A valve assembly for use in internal combustion engine applications, of the type designed to regulate air-fuel mixture from a carburetor or other fuel injection means entering the cylinders of either two stroke cycle or four stroke cycle spark ignition engines to improve the part-load and full-load fuel efficiency of such engines by minimizing the pumping losses. This increase in efficiency is accomplished by regulating engine power output by employing time-duration-modulation control instead of the throttled or resistive intake control which is empolyed in the engines of the prior art. A rotary valve structure employs a tubular multi-port member comprising a rotary valve, with an outlet for each cylinder, operating at 15 p.s.i. maximum differential pressure and relatively low temperatures, connected in series with presently used poppet or reed or port type intake valves. Rotary valve timing or phase control is accomplished with a multi-pulley belt drive system.

Abstract: A rotary valve assembly will be utilized on internal combustion engines for regulating air-fuel mixture from a carburetor or other fuel injection system entering the cylinders of either two stroke or four stroke spark ignition engines serving to improve the part-load fuel efficiency of such engines by minimizing the pumping losses. This increase in efficiency is accomplished by substituting what is termed "time-duration-modulation" control for the present day "throttled" or "resistive" intake control now used to regulate engine power output. The rotary valve structure employs a hollow, or open sleeve, or tubular multi-port structure comprising the rotary valve, with an outlet for each cylinder, operating at fifteen (15) p.s.i. maximum differential pressure and relatively low temperatures, connected in series with presently used poppet or port type intake valves. Rotary valve timing or phase control is accomplished with a multi-pulley belt drive system.