High pressure pump

A pump comprising

• a resilient solid body of specified body size and having an exposed face;
• an opposing member formed of a material relatively harder than said resilient body, said opposing member further having an exposed working face opposing the face of said resilient body;
• an encircling peripheral shoulder on said resilient solid body which resiliently seals against said opposing member;
• a generally circular cavity formed in one of said faces interiorally of said shoulder which seals about said cavity to capture without escape a fluid therein to be pumped, said cavity being closed to capture fluid by said resilient solid body on reciprocating said working face relative to the face of said resilient solid body, said cavity being sufficiently shallow in comparison with the size of said resilient solid body to enable said body to resiliently collapse into the cavity to thereby reduce the volume of said cavity within said shoulder to pump fluid from said cavity wherein the reduction of volume is substantial by all of the volume and is a function of the relative movement of said faces toward one another;
• means for positioning said resilient solid body and said working face at a specified location relative to one another;
• an outlet passage means opening from said cavity providing an escape path for fluid pumped from said cavity when said cavity is reduced in volume;
• means adapted to capture a fluid to be pumped in the vicinity of said opposing faces so that said cavity is at least partly filled with fluid;
• means for relatively moving said opposing faces in repetitive pumping motion toward one another, said cavity capturing fluid between said faces inside said shoulder to pressure fluid in a pumping action flowing into said outlet passage means;
• said moving means comprising a generally circular chamber divided into two portions by a diaphragm thereacross;
• a port opening into said chamber for introducing fluid under pressure to said chamber to move said diaphragm;
• a plate-like member contacted against said diaphragm to be moved by said diaphragm;
• a piston rod connected to said plate-like member;
• a body surrounding said piston rod and connected to said chamber;
• a seal means cooperative with said body and said piston rod for sealing against leakage therepast;
• said seal means being constructed and arranged such that one end of said piston rod is exposed within a generally closed internal cavity within a housing therein said cavity comprises a portion of said capturing means for fluid;
• said moving means including an encircling hollow sleeve about said resilient member and slidably on an end of said piston rod, said sleeve exposing the face of said resilient member.