Patent ID: 7748576

Claim:
A pump assembly with a pressable head, comprising a push tube, an inner tube, a stop valve, and an outer tube; the push tube being a tubular structure; a top of the push tube passing through the outer tube; the push tube communicated with the inner tube; the inner tube being a tubular structure; a bottom of the inner tube having an annular plug formed thereon; the annular plug having a plurality of via holes defined therein, the via holes having inclined inner walls; the stop valve disposed on a top of the inner tube; the stop valve being a flat structure; an elastic structure formed on a periphery of the stop valve; by elastic deformation of the elastic structure, the stop valve tightly adhered to an inner wall of the outer tube; a plurality of stoppers protruded from a bottom of the stop valve and corresponding to the via holes; and the outer tube being a tubular structure; an interior of the outer tube being a stepped structure having a greater diameter at an upper side and a smaller diameter at a lower side; a largest diameter of the interior of the outer tube being greater than outer peripheries of the push tube and the inner tube so that the push tube and inner tube are received in the outer tube.