Abstract: A stride emulator device for efficiently utilizing human leg power for transference to a rotary drive system including a pair of levers, at least two gears, at least two crankshafts having crank arms, and where each lever includes a cam and cam track.

Abstract: A stride emulator device for efficiently utilizing human lea, power for transference to a rotary drive system including a pair of levers, at least two gears, at least two crankshafts having crank arms, and. where each lever includes a cam and cam track.

Abstract: Phase gear and lever mechanism converts reciprocating power to rotary power with phase gear providing power stroke of greater duration than travel stroke so as to develop efficient power through a power stroke. A modified lever and gear mechanism converts reciprocating power to rotary power at variable out power ratio. In addition, an alternative embodiment of the variable lever is for use with the phase gear is provided.

Abstract: A folding chair having seat, backrest, front leg, and rear leg interconnected with backrest pivoted to front leg and back leg, and seat pivoted to front leg and back leg so as to lock backrest when chair is unfolded, and when weight is applied to the seat a force is applied further locking the backrest. A modification provides a folding chair with outer and inner frames for locking backrest and rear leg in position when chair is unfolded for use.

Abstract: Phase gear and lever mechanism converts reciprocating power to rotary power with phase gear providing power stroke of greater duration than travel stroke so as to develop efficient power through a power stroke. A modified lever and gear mechanism converts reciprocating power to rotary power at variable out power ratio. In addition, an alternative embodiment of the variable lever is for use with the phase gear is provided.

Abstract: A folding chair having seat, backrest, front leg, and rear leg interconnected with backrest pivoted to front leg and back leg, and seat pivoted to front leg and back leg so as to lock backrest when chair is unfolded, and when weight is applied to the seat a force is applied further locking the backrest. A modification provides a folding chair with outer and inner frames for locking backrest and rear leg in position when chair is unfolded for use.

Abstract: Phase gear and lever mechanism converts reciprocating power to rotary power with phase gear providing power stroke of greater duration than travel stroke so as to develop efficient power through a power stroke. A modified lever and gear mechanism converts reciprocating power to rotary power at variable out power ratio. Both converting mechanisms are applied as bicycle drive mechanisms. Both mechanisms are applied together in a bicycle one as a drive mechanism, the other for synchronizing the drive mechanism.

Abstract: Phase gear and lever mechanism converts reciprocating power to rotary power with phase gear providing power stroke of greater duration than travel stroke so as to develop efficient power through a power stroke. A modified lever and gear mechanism converts reciprocating power to rotary power at variable out power ratio. Both converting mechanisms are applied as bicycle drive mechanisms. Both mechanisms are applied together in a bicycle one as a drive mechanism, the other for synchronizing the drive mechanism.

Abstract: A folding chair having at least one offset pyramid hinge, two chair legs, a chair-backing, and a seating member which can fold substantially flat in a closed position, and can substantially lock open in an opened position. The offset hinge of the chair promotes the chair remaining in either a flattened or open position by positioning the intersecting junctions at apices which are offset from one another.

Abstract: A folding chair having at least one offset pyramid hinge, two chair legs, a chair-backing, and a seating member which can fold substantially flat in a closed position, and can substantially lock open in an opened position. The offset hinge of the chair promotes the chair remaining in either a flattened or open position by positioning the intersecting junctions at apices which are offset from one another.