Importance

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Abstract

A dispensing device including a pump assembly for pumping out the viscous liquid material stored in the device. The pump has a cylinder and a piston disposed within the cylinder, wherein the cylinder includes a cylinder inlet valve and the piston includes a cylinder outlet valve. Each operation of the pump assembly causes the piston to move in a first direction toward the cylinder inlet valve and in a second direction away from the cylinder inlet valve. The movement of the piston in the first direction causes the cylinder inlet valve to close and the cylinder outlet valve to open. The movement of the piston in the second direction causes the cylinder inlet valve to open and the cylinder outlet valve to close. 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, thereby causing a substantially corresponding predetermined volume of the viscous liquid material to be dispensed by the device. 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 thereby refilling the cylinder with the viscous material.

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First Claim