Pump sprayer

Details Pump sprayer Pump sprayer

1975-11-19

1977-10-04

Tolberg, Stanley H.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

239333, 417435, B05B 100

Patent

active

040519830

ABSTRACT:
A dispensing pump having upper and lower pistons defining opposite ends of a two diameter pump chamber, the volume of which is varied by movement together of the pistons, while a small amount of relative movement of the pistons, resulting from pressure changes within the pump chamber, effects opening and closing of the discharge valve. For facilitating the priming of such a pump, the lower piston and cylinder are arranged to define a normally closed priming valve operable at a predetermined point in the lower piston stroke to permit reverse flow of entrapped air from the pump chamber into a liquid supply container with which the pump is associated.

REFERENCES:
patent: RE28366 (1975-03-01), Pechstein
patent: 3463093 (1969-08-01), Pfeiffer et al.
patent: 3774849 (1973-11-01), Boris
patent: 3799448 (1974-03-01), Nozawa et al.
patent: 3908870 (1975-09-01), Nozawa et al.

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