Patent ID: 6872060
Filing Date: 2005-03-29
Classification: F04B

Abstract:
1. A pump comprising: a first cylinder housing including a chamber formed therein, and including a first end having a mouth and a port provided therein, and including a second end, a piston slidably engaged in said chamber of said first cylinder housing for separating said chamber of said first cylinder housing into a first portion that is located closer to said mouth and said port and a second portion that is located away from said mouth and said port, said port of said first cylinder housing permitting a fluid to flow therethrough and to flow into said first portion of said chamber of said first cylinder housing when said piston moves away from said port, a tube coupled to said piston for allowing the fluid in said second portion of said chamber of said first cylinder housing to flow out through said tube when said piston moves away from said mouth and said port, a first check valve means for blocking said tube to prevent the fluid from flowing into of said first cylinder housing via said tube, and a second check valve means for blocking said port to prevent the fluid from flowing out of said first portion of said chamber of said first cylinder housing when said piston moves toward said port.