PUMP WITH MUSCULAR DRIVE OF OVANDER'S SYSTEM (VERSIONS) Russian patent published in 2010 - IPC F04B9/14 

FIELD: engines and pumps.

SUBSTANCE: proposed pump relates to production of hydraulic drives and can make a pump for hydraulic jacks, tools, drive for pipeline valves and accessories, or a standby pump in various hydraulic drives, etc. Proposed pump incorporates a stepped delivery control systems to allow selecting high or low delivery, which serves to efficiently exploit muscular force of an operator at both high and low working fluid pressure in hydraulic system. Pump comprises a cylinder with intake and discharge lines that have check valves, said cylinder accommodating piston and plunger to axially reciprocate therein driven by operator muscular forces via plunger head axle and piston-to-plunger coupler representing inner and outer stops on plunger. Plunger outer stop can vary its position along the plunger and represents, for example a hook embracing the plunger to turn about aforesaid axle arranged in plunger head, forced by operator's hand or foot. In compliance with second version, plunger outer stop can represent a sleeve fitted on plunger to turn about its axis and having its ledges facing the piston that is furnished with mating recesses.

EFFECT: higher efficiency, fast switching from hand- to foot-drive operation.

4 dwg, 4 cl