Patent · US Expired

Switching device for a machine

US6679281B1 · kind B1 · utility

2Cited by

3References

23Claims

0Family size

Assignee

HYDAC FLUIDTECHNIK GMBH · DE

Inventors

Gerd Anton Thiry · Wadgassen, DE
Harald Bar · Hemhofen, DE
Martin Schaus · Karlsruhe, DE

Key dates

Filing date	Dec 26, 2001
Grant date	Jan 20, 2004
Priority date	—
Expiry date	Dec 26, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/87169
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A switching device for a machine, especially a digger, has at least one supply connection and one useful connection in addition to at least one hydraulic accumulator. An on-off valve is arranged between the supply connection and the useful connection, and separates the supply connection at least partially from the useful connection in one of its switching positions, in addition to ensuring that the hydraulic accumulator is charged on the fluid side via the supply connection. In another switching position, the supply connection is connected to the useful connection. A substantial improvement relative to conventional switching devices is attained by being able to guarantee an emergency function before the machine is used to perform work.

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