Pump sprayer

Details Pump sprayer Pump sprayer

B - Operations, Transporting

05

B

222/78

B05B 11/00 (2006.01)

Patent

CA 1054581

ABSTRACT Disclosed is a pump sprayer of the class which in- cludes a pair of relatively aligned upper and lower pistons of relatively large and relatively small diameter respec- tively working in different diameter portions of a common pump chamber which has its lower end adapted for communi- cation with a supply of liquid to be dispensed. Both the pistons have valve controlled flow passages therethrough to permit unidirectional upward flow only of the liquid through the pump chamber and means are provided for reciprocating the pistons substantially in unison. The improved sprayer includes means within the pump chamber co-operating with the small diameter piston near the end of the downward stroke of the latter to permit flow of entrapped air from the pump chamber downwardly past the small diameter piston into the lower end of the pump chamber beneath the small diameter piston.

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