Fluid dispenser

A high-viscosity fluid dispensing pump comprising:

• a molded polymer reservoir chamber having a first end, a second end distal from the first end, and a wall extending along a length of the reservoir chamber;
• a molded polymer pump head, non-removably and/or removably positioned adjacent the first end of the reservoir chamber;
• the pump head including:
• a pump body, the pump body including a pump cavity formed therein, the pump cavity in fluid communication with the reservoir chamber;
• a first one-way valve positioned between the reservoir chamber and the pump cavity of the pump body configured to allow passage of a higher viscosity fluid only from the reservoir chamber into the pump cavity;
• a piston slidably engaged with the pump cavity, the piston including a pump outlet formed in the piston, the pump outlet in fluid communication with the pump cavity;
• and
• a spring positioned at least partially around the pump cavity such that the spring resists urging of the piston to slidably engage with the pump cavity in one direction, and aids slidable engagement of the piston with the pump cavity in the opposite direction;
• the spring also reinforces the pump cavity, thus enabling the polymer pump cavity to withstand higher internal pressures;
• a second one-way valve positioned between the pump outlet and the first one-way valve, the second one-way valve configured to allow passage of a higher viscosity fluid only in a direction from the pump cavity to the pump outlet;
• a single piece molded handle comprising:
• a first handle portion attached adjacent the first end of the reservoir chamber and extending substantially downward from the dispenser;
• a second handle portion located adjacent the end of the piston and extending substantially downward from the dispenser;
• and
• a bridge portion connecting the first handle portion to the second handle portion;
• wherein the reservoir chamber is non-removably secured to the pump head to discourage reservoir chamber replacement and/or refilling, and re-use of the dispenser after all of the higher viscosity fluid within the reservoir chamber is expelled from the dispenser;
• wherein the reservoir chamber is removably secured to the pump head to allow reservoir chamber replacement and/or refilling, and re-use of the dispenser.

A method of constructing a higher viscosity fluid dispensing pump comprising the steps of:

• molding a reservoir chamber from a polymer material, the reservoir chamber comprising a first end, a second end, and a wall formed along a length thereof;
• molding a pump head from a polymer material, the pump head comprising a pump body including a pump cavity formed therein, a first handle portion, a bridge portion, and a second handle portion;
• providing a first one-way valve positioned between the reservoir chamber and the pump cavity of the pump body;
• providing a piston including a pump passage formed therethrough;
• and
• providing a second one-way valve mounted on the piston between an outlet of the pump and the first one-way valve and in fluid communication with the pump passage of the piston;
• slidably engaging the piston with the pump cavity of the pump body such that the piston is located between the second handle portion and the first handle portion.