Patent ID: 6200055
Filing Date: 2001-03-13
Classification: A45D,B05B

Abstract:
A dispensing device comprising:a pump assembly for pumping out the viscous liquid material stored in the device, the pump including a cylinder and a piston disposed within the cylinder, the cylinder having a cylinder inlet valve orifice and the piston having a cylinder outlet valve orifice, wherein each operation of the pump assembly causes the piston to move in a first direction toward the cylinder inlet valve orifice and in a second direction away from the cylinder inlet valve orifice, the movement of the piston in the first direction causing the cylinder inlet valve orifice to be closed and the cylinder outlet valve orifice to be opened, the movement of the piston in the second direction causing the cylinder inlet valve orifice to be opened and the cylinder outlet valve orifice to be closed;wherein, when the pump assembly is primed with viscous liquid material, movement of the piston in the first direction pumps a predetermined volume of the viscous liquid material from the cylinder through the opened cylinder outlet valve orifice, thereby causing a substantially corresponding predetermined volume of the viscous liquid material to be dispensed by the device, and the movement of the piston in the second direction draws a substantially corresponding predetermined volume of the viscous liquid material from the device into the cylinder through the opened inlet valve orifice thereby refilling the cylinder with the viscous material.