AUTOMATIC VARIABLE LEVERAGE MANUAL HYDRAULIC PUMP

摘要

A manual pump for a sailboat having an increased mechanical advantage construction. The pump may be reciprocal or rotary at the operator interface. The pump uses the pressure generated at higher pressures to be fed back to a cylinder or the like to increase the mechanical advantage so the operator input at higher pressure up to highest pressure remains, nominal say 30 lbs. force, compared to present pumps which require higher force say 50 lbs. force. The length of the pump lever, the pump linkage, or the fulcrum or the pivot point changes to change the mechanical advantage.