Positive displacement vacuum pump having a piston actuated by an

Details Positive displacement vacuum pump having a piston actuated by an Positive displacement vacuum pump having a piston actuated by an

1994-07-27

1995-12-05

Berisch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

417470, 92136, F04B 1900

Patent

active

054723221

ABSTRACT:
Positive displacement vacuum pump is provided with a pump body, and a piston is positioned in the pump body with the piston being mounted for actuation by alternative linear movement. An elastic element biases the piston in a first direction, and a cam acts on a first end of the piston, with the cam being rotatably movable along an axis that is coaxial with the longitudinal axis of the piston to drive the piston in an alternating linear movement. A transverse bar is positioned between a first end of the piston and the cam, and the transverse bar is rotatably fixed but translationally guided in the direction of alternative linear movement of the piston. Additionally, the cam comprises a double surface to equally bias the transverse bar at two positions along the length of the bar.

REFERENCES:
patent: 1929935 (1933-10-01), Rennerfelt
patent: 2540357 (1951-02-01), Stanley
patent: 4824336 (1989-04-01), Iwaki
patent: 5028217 (1991-07-01), Miller
patent: 5037276 (1991-08-01), Tremoulet, Jr.
patent: 5253981 (1993-10-01), Yang et al.
patent: 5355920 (1994-10-01), Tanguay

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