Hand-held vacuum and pressure pump

Details Hand-held vacuum and pressure pump Hand-held vacuum and pressure pump

1988-09-30

1990-09-04

Smith, Leonard E.

Pumps

Expansible chamber type

Having separate noncyclic valve

417566, 417569, F04B 4100, F04B 3910

Patent

active

049540548

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.

REFERENCES:
patent: 3612722 (1971-10-01), Neward
patent: 3664774 (1972-05-01), Tupper et al.
patent: 4205641 (1981-08-01), Brimhall
patent: 4775302 (1988-10-01), Neward

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