Vacuum system

Details Vacuum system Vacuum system

1978-02-22

1980-05-27

Smith, Leonard E.

Pumps

Motor driven

Fluid motor

91229, F04B 4500, F01L 2104

Patent

active

042048125

ABSTRACT:
Disclosed is a vacuum pump device that is adapted to create a vacuum source from a source of high pressure air. The device comprises a piston actuated in one direction by compressed air and in the opposite direction by a power return spring. The compressed air moves the piston to load the spring and the spring moves the piston to create a vacuum. A special dumping valve is also provided which is actuated toward the end of the return stroke of the piston to cause a sudden increase in the pressure differential across the piston to prevent stalling of the piston when loading is such that the piston moves very slowly, thereby assuring that the vacuum pump will cycle as often as is necessary to maintain the desired vacuum.

REFERENCES:
patent: 983729 (1911-02-01), Laidley
patent: 2597059 (1952-05-01), Bitzer
patent: 3131640 (1964-05-01), Rohde et al.
patent: 3294030 (1966-12-01), Fox
patent: 3514226 (1970-05-01), Wood
patent: 3605556 (1971-09-01), Erdmann
patent: 3749527 (1973-07-01), Slagle

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