Pumps – Expansible chamber type – Having separate noncyclic valve
Patent
1986-09-08
1988-10-04
Croyle, Carlton R.
Pumps
Expansible chamber type
Having separate noncyclic valve
417566, 417569, F04B 4100, F04B 3910
Patent
active
047753021
ABSTRACT:
A small and compact vacuum-pressure pump which serves as a portable vacuum-pressure source is disclosed. The pump includes a cylinder coupled with one handle and a piston therein coupled with another handle. A valving means with a rotatable in a cylinder allows either a vacuum or pressure to be created at a port to the valving means. The valving means which is located ahead of an inlet valve to the cylinder can adapt a preexisting vacuum pump to operate either as a vacuum pump or a pressure pump as required.
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Croyle Carlton R.
Neils Paul F.
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