Patent ID: 8770954
Filing Date: 2014-07-08
Classification: F03G,F04B,F16K,Y10S,Y10T

Abstract:
1. A human-powered pump assembly comprising: a frame; a treadle pivot attached to the frame, the treadle pivot defining a fixed horizontal rotational axis; a pair of treadles coupled to the treadle pivot; a rocker pivot attached to the frame, the rocker pivot defining a separate horizontal rotational axis; a pair of cylinders coupled to the frame; a piston disposed in each of the cylinders, each piston comprising a connecting rod forming a channel along a longitudinal axis of the connecting rod; and a reciprocating rocker coupled to the rocker pivot and to the pair of treadles to constrain the motion thereof, wherein the rocker pivot axis is located below the treadle pivot axis throughout a full range of motion of the assembly.