Patent · US Expired

Hydraulic ram

US4549469A · kind A · utility

5Cited by

3References

14Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Karl-Heinz Plester · Grafenau, DE
Klaus-Dieter Reddig · Grafenau, DE
Heinz Hessel · Flaesheim, DE

Key dates

Filing date	Nov 3, 1983
Grant date	Oct 29, 1985
Priority date	—
Expiry date	Nov 3, 2003

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF15B15/2861
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A hydraulic ram for use as an advance ram in mining operations has a plurality of permanent magnets embedded in its piston rod. At least one sensor is associated with a guide bush fixed to the piston rod end of the cylinder of the ram. The or each sensor is accommodated within a respective pocket formed in the guide bush. The pocket(s) can be closed off by a detachable closure member.

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