Hand pump

Abstract

A hand pump which is threadably mounted on the throat of a liquid container with the throat having a throat plug assembly mounted therein. The pump includes a lower housing having an upper housing movably embracing the lower housing. The upper housing is selectively movable between a normal extended position to a compressed position relative to the lower housing. When the upper housing is moved from its extended position to its compressed position, a piston and piston rod assembly pumps liquid from the lower housing outwardly from the upper housing.

1 . A hand pump for use with a liquid container having a hollow, externally threaded throat, having a throat plug assembly positioned therein, comprising:
 a lower, cup-shaped housing having a horizontally disposed bottom wall and an upstanding wall portion extending upwardly therefrom;   said lower, cup-shaped housing having an open upper end;   said bottom wall having upper and lower sides;   a centrally positioned, ring-shaped, internally threaded connector member extending downwardly from said lower side of said bottom wall for threadable connection to the externally threaded throat of the container;   a centrally positioned, ring-shaped boss extending downwardly from said lower side of said bottom wall within said connector member for engagement with the throat plug assembly when said lower housing is threadably secured to the threaded throat of the container to permit liquid to flow from the container upwardly through the throat plug assembly;   a cylindrical valve ball retainer wall, having an upper end, extending upwardly from said upper side of said bottom wall at the center thereof;   an opening, having upper and lower ends, formed in said bottom wall within said retainer wall;   said lower end of said opening being in communication with the interior of said connector member;   said upper end of said opening defining an upwardly presented first valve seat;   a first valve ball positioned within said valve ball retainer which is adapted to seat upon said first valve seat at times;   a vented cap positioned on said upper end of said valve ball retainer;   a horizontally disposed, disc-shaped cap selectively secured to said upper end of said lower cup-shaped housing;   said cap having a central opening formed therein;   an upper, inverted and generally cup-shaped housing which has a cylindrical wall portion selectively vertically movably embracing said upstanding wall portion of said lower cup-shaped housing;   said upper housing having an open lower end and a closed upper end;   said upper housing being movable between a normal extended position to a compressed position relative to said lower housing;   a disc-shaped and horizontally disposed piston positioned in said lower housing below said disc-shaped cap on said upper end of said lower housing;   said piston having a central opening formed therein;   a vertically disposed hollow piston rod, having upper and lower ends, secured to said piston which extends upwardly therefrom through said central opening in said cap on said upper end of said lower housing;   said piston rod having an upwardly presented second valve seat formed therein adjacent said upper end thereof;   said piston being movable between upper and lower positions in said lower housing;   a second valve ball positioned in said piston rod above said second valve seat which seats upon said second valve seat to close the same at times;   a retainer above said second ball valve for limiting the upward movement thereof;   and a discharge spout having inner and outer ends;   said inner end of said discharge spout being in fluid communication with said upper end of said piston rod above said second valve ball;   said outer end of said discharge spout being positioned laterally of said upper housing;   and a spring which yieldably maintains said upper housing in said extended position.   
     
     
         2 . The hand pump of  claim 1  wherein said spring embraces said piston rod between said cap and said closed upper end of said upper housing.