Patent · US Expired

Gearshift device for electrically controlled gearboxes

US5388477A · kind A · utility

7Cited by

8References

2Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Walter Frei · Friedrichshafen, DE
Wilhelm Hardtle · Markdorf, DE
Gunter Schwarz · Altenkirchen, DE

Key dates

Filing date	Nov 24, 1993
Grant date	Feb 14, 1995
Priority date	—
Expiry date	Nov 24, 2013

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/20091
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A gearshift device for electrically controlled transmissions is provided having a shifting lever pivotable in two parallel planes and guided in slides which have a connecting link only in the area of a neutral shifting position. Such gearshift devices are used particularly in construction machines. By way of a lock, which is activated below an admissible speed, a shift to the neutral position and into the opposite direction of travel is prevented. At higher speeds, accidental faulty shifts are prevented by a step-by-step gearshift mechanism. The locks, according to the invention, require only few regulation measures since they contain two mutually independent locking systems.

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