Patent ID: 9611839
Date: 2017-04-04
CPC Classifications: A47K,B05B,F04B

Claim:
1. A pull pump comprising: a housing; a piston that reciprocates within the housing; the piston having an outer wall and at least a portion of the center of the piston is hollow; the piston includes an orifice form the outer wall to the center of the piston; a first seal is located proximate the upper end of the piston to provide a seal between the piston and the housing; the first seal is located above the orifice in the piston wall; a liquid inlet in the side wall of the housing at a point lower than the top of the piston; a one-way liquid inlet valve; a liquid outlet having a one-way liquid outlet valve; a charge chamber defined at least in part by the one-way liquid inlet valve, the one-way liquid outlet valve, a wall of the housing and a wall of the piston; and a mixing chamber located downstream of the one-way liquid outlet valve;