Patent ID: 8286837
Filing Date: 2012-10-16
Classification: B05B,G01F

Abstract:
1. A power assembly for attachment to a container of product to obtain duration discharge of the product from the container, said power assembly comprising: a pump mechanism having a pump cylinder and a piston reciprocal therein, said pump cylinder and piston defining a pump chamber; a normally closed discharge valve connected with the pump chamber to prevent discharge of product from the pump chamber when the valve is closed and operable to permit discharge of product from the chamber when the valve is open; an actuator connected with the discharge valve to move it to open position; drive means connected with said piston for reciprocating the piston in a first direction from an at-rest position to draw product from the container and into the pump chamber, said drive means including a rotatable actuating collar, said actuator, and a drive screw, said drive screw having drive screw gear teeth thereon and said actuator having first gear teeth connected with said rotatable actuating collar and second gear teeth connected with the gear teeth on said drive screw, wherein rotation of said actuating collar causes rotation of said actuator which causes rotation of said drive screw to reciprocate said piston in said first direction when the actuating collar is rotated; and an energy storage means connected with the pump mechanism for storing energy when the piston is moved in said first direction, said energy storage means exerting pressure on the piston to move it in a second direction to pressurize product in the pump chamber.