Patent · US Expired

Vacuum pump and method of operating the same

US4483667A · kind A · utility

9Cited by

6References

14Claims

0Family size

Assignee

Leybold-Heraeus GmbH · DE

Inventors

Hanns-Peter Berges · Neunburg vorm Wald, DE
Peter Frieden · Cologne, DE
Hans-Peter Kabelitz · Cologne, DE

Key dates

Filing date	Dec 16, 1982
Grant date	Nov 20, 1984
Priority date	—
Expiry date	Dec 16, 2002

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04C29/02
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A vacuum pump comprises a suction nipple valve including a cylinder, a piston slidably received therein and a movable valve closing member operatively connected to the piston. The vacuum pump further has a pressure medium conduit having a first end communicating with the cylinder; an inlet opening at a second end of the conduit for pressure medium to flow through the inlet opening to the piston; a control arrangement for closing and opening the inlet opening dependent upon run or standstill of the vacuum pump. In the closed state of the inlet opening an oil quantity is maintained above the inlet opening.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.