Hand held pump

Abstract

A hand held vacuum and pressure pump has a fixed handle, with a movable handle pivotally connected thereto at one end thereof, the fixed handle being fixed to a pump cylinder so as to be perpendicular thereto. A spring loaded piston rod extends from the movable handle through the fixed handle and is fixedly attached at one end to a piston which is contained in the pump cylinder and has a peripheral O-ring forming a seal therewith. Valve means controls whether manual movement of the movable handle toward the fixed handle forces fluid contained in the cylinder out of the cylinder or draws fluid into the cylinder. The movable handle has a longitudinal recess formed therein through which a connecting pin extends, the connecting pin being connected to the piston rod at the piston rod end remote from the piston, so that the arcuate movement of the movable handle toward and away from the cylinder permits the connecting pin to move longitudinally in the movable handle longitudinal recess, whereby the piston rod moves linearly when moving longitudinally in the cylinder, thereby avoiding canting the piston and so scuffing the O-ring when the piston rod moves longitudinally in the cylinder.

Dependencies are inferred from the claim text.