Plastic sanitary pump

Claim 1

A sanitary pump comprising: a tubular cylinder having upper and lower openings at each end thereof; a flexible sealing cup surrounding the lower cylinder opening; piston means slidably mounted within said cylinder, said piston means comprising a lower rigid washer plug having a flat annular body and a vertically extending centrally positioned post, an upper rigid annular washer having a centrally positioned aperture fitted over said post and a flexible annular piston element sandwiched between said lower washer plug and said upper washer; a hollow piston rod, said piston means vertical post being mounted within said hollow piston rod and being maintained in place by welding the vertical post to said hollow piston rod; a handle, said handle being attached to an upper end of said piston rod; a disc, said disc being positioned under said handle and mounted for movement with said handle for preventing water from reaching a user's hand; and a cap mounted on and partially closing said cylinder upper opening, said cap including at least one air outlet and a central aperture for guiding said piston rod.