Hand-operated reciprocating pump

Abstract

A reciprocating pump includes a cylinder; a piston including apertures and an annular bottom flange; a first check valve secured to a piston rod and including an annular groove; a coupling at cylinder bottom; a sealing ring sandwiched between the cylinder bottom and the coupling; a second check valve engaged with the ring and including tunnels and a bottom socket; and a metal block fitted in the socket. Pushing a handle upward will move the piston rod downward to sealingly engage the flange with the groove, remove air from the cylinder, and block the coupling by both the socket and the block. Pushing the handle downward will move the piston rod upward to disengage the flange with the groove, open the second check valve, suck fluid into the cylinder through the coupling, the tunnels, and the apertures, and discharge the fluid.

1 . A reciprocating pump comprising: 
 a cylinder including a spout;    a piston slidably provided in the cylinder and including a piston rod extended through beyond a top of the cylinder, a plurality of apertures, and an annular bottom flange;    a moveable first check valve secured to a lower end of the piston rod and including a plurality of cavities provided on its top, and an annular groove provided along its peripheral edge;    a handle including a front end pivotably connected to a top end of the piston rod, and a plurality of pivots, and a link having a lower end pivotably connected to the cylinder and an upper end releasably, pivotably connected to one of the pivots;    a hollow, staged coupling provided at a bottom end of the cylinder;    a sealing ring sandwiched between the bottom end of the cylinder and the coupling;    a second check valve including a top surface engaged with the sealing ring, a plurality of peripheral tunnels, a cylindrical socket extended downward from a central part of its bottom, and an annular trough provided between the socket and the tunnels; and    a metal block fitted in the socket;    wherein in response to pushing the handle upward, the piston rod moves downward in the cylinder to sealingly engage the flange with the groove, remove air from the cylinder, and block the coupling by both the socket and the block; and    in response to pushing the handle downward as an immediately next stroke of the piston, the piston rod moves upward in the cylinder to disengage the flange with the groove, disengage the second check valve with the coupling, suck fluid from a reservoir into an upper portion of the cylinder through the coupling, the tunnels, a gap between the first check valve and the piston, and the apertures, and discharge the fluid out of the spout from the upper portion of the cylinder.    
   
   
       2 . The reciprocating pump of  claim 1 , wherein the cylinder further comprises a projected joint pivotably connected to the lower end of the link.