Patent ID: 8096788
Filing Date: 2012-01-17
Classification: F04B

Abstract:
1. A pump as comprising: a tube having a first end and a second end, first and second chambers extending through the tube, a channel extending through the tube, and an orifice extending through the tube and opening to the channel; a base connected to the second end of the tube and including a first passage opening to the first and second chambers and a second passage opening to the first passage and the channel; first and second rods, with the first rod received in the first chamber and the second rod received in the second chamber; a handle connected to the first and second rods at one end; and a switching device including a switch rod disposed in the channel and a shaft received in the orifice for selectively moving the switch rod to a first position for enabling air flow through the second passage to the channel and a second position for preventing air flow through the second passage to the channel, wherein the shaft comprises a first portion and a second portion, with the first portion having a diameter less than that of the second portion, with the first portion eccentrically disposed relative to the second portion, and with the first portion abutted by the rod.