Spray pump assembly

Pumps – Expansible chamber type – Valved piston

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Details

F04B 2104, G01F 1102

Patent

active

040638545

ABSTRACT:
A finger-operated spray pump assembly adapted to maintain a seal against leakage under substantially all conditions normally encountered by the pump. The assembly includes a compression chamber, a piston slidable in the compression chamber, a stem slidable in the piston, and a seal member abutting the piston. The lower end of the valve stem contacts the seal member to open the seal slightly before the piston starts its downstroke. A closure member for the container to be used is permanently attached to the spray pump.

REFERENCES:
patent: 3187960 (1965-06-01), Gorman
patent: 3627206 (1971-12-01), Boris
patent: 3640470 (1972-02-01), Susuki
patent: 3954354 (1976-05-01), Boris

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