Precise output pump sprayer

Details Precise output pump sprayer Precise output pump sprayer

1986-04-03

1987-09-08

Freeh, William L.

Pumps

Expansible chamber type

Valved piston

222385, F04B 2104, F04B 3910

Patent

active

046921036

ABSTRACT:
A pump sprayer has a body with aligned relatively large and small diameter cylinder portions and relatively large and small diameter pistons respectively reciprocable therein and delimiting with the cylinder a variable volume pump chamber during pumping, the small diameter piston shifting relative to the large diameter piston for opening the discharge. Cooperating limit stops acting between the piston members limit the relative movement thereof during a valve open position so as to thereby limit the duration during which the discharge passage is open irrespective of different external reciprocating pressures applied during pumping, such that the output of the sprayer is controlled during pumping.

REFERENCES:
patent: 4051983 (1977-10-01), Anderson
patent: 4088425 (1978-05-01), Bonnett
patent: 4147476 (1979-04-01), Warren
patent: 4245967 (1981-01-01), Busselet
patent: 4344744 (1982-08-01), Schuster

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