Pumps – Expansible chamber type – Having separate noncyclic valve
Patent
1989-09-22
1991-04-30
Smith, Leonard E.
Pumps
Expansible chamber type
Having separate noncyclic valve
417569, 92194, F04B 4100, F04B 3910
Patent
active
050113810
ABSTRACT:
There is disclosed herein a small and compact vacuum pump which serves as a portable vacuum source. The pump basically includes a cylinder coupled with a handle, and a piston in the cylinder coupled with another handle, along with a suitable valving assembly for allowing a vacuum to be drawn at an inlet of the pump. More particularly, there is also disclosed a vacuum release which can be attached to or form an integral part of the pump. The vacuum release comprises a closure member which can be moved upwardly and downwardly in a housing to close and open with respect to a valve seat and, respectively, allow a vacuum to be pulled or release the vacuum. The closure member is arranged to rotate and is biased by a suitable helical torsion spring to normally maintain the closure member in the closed position to therefore normally allow a vacuum to be drawn by the pump. The vacuum release can be operated by one finger of the pump operator's hand and against the force of the spring to enable the vacuum to be simply and easily released.
REFERENCES:
patent: 3467138 (1969-09-01), Haddix et al.
patent: 3612722 (1971-10-01), Neward
patent: 4412669 (1983-11-01), Hanyu et al.
patent: 4775302 (1988-10-01), Neward
patent: 4806084 (1989-02-01), Neward
Smith Leonard E.
Szczecina Jr. Eugene L.
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