Patent · US Expired

Manually operable vacuum pump

US5494410A · kind A · utility

32Cited by

9References

10Claims

0Family size

Assignee

ZEO-Tech. Co., LTD · KR

Inventors

Peter Maier-Laxhuber · Munich, DE
Andreas Becky · Ottobrunn, DE
Gerald Heggl · Herrsching am Ammersee, DE

Key dates

Filing date	Feb 17, 1994
Grant date	Feb 27, 1996
Priority date	—
Expiry date	Feb 17, 2014

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04B37/14
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A manually operable vacuum pump having a housing including first and second pump chambers whose volume is altered by movement of a displaceable piston which is moved by means of a piston rod attached thereto and fed through one of the first and second pump chambers. The first and second pump chambers are configured such that gas which is fed into the vacuum pump is compressed in two steps, primarily in the first pump chamber and secondarily in the second pump chamber to provide a suitable endvacuum. Thereafter, the gas is expelled from the second pump chamber through the second end cap.

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