Patent · US Active

Working machine and method for working the ground

US11473375B2 · kind B2 · utility

0Cited by

2References

10Claims

0Family size

Assignee

BAUER Maschinen GmbH · DE

Inventors

Sebastian Bauer · Berlin, DE
Christian Fischer · Waldbronn, DE
Andreas Schober · Erfurt, DE

Key dates

Filing date	Jul 12, 2017
Grant date	Oct 18, 2022
Priority date	—
Expiry date	Oct 22, 2037

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B7/021
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The invention relates to a working machine and a method for working the ground with the working machine, having a mast, along which, by means of a positioning means, a rotary head is moved vertically, by which a telescopic Kelly rod having at least two Kelly bars is displaced and guided. According to the invention the Kelly bars are locked or unlocked automatically by means of a control, wherein by means of a first detection means a rotation angle of at least one Kelly bar is detected and/or by means of a second detection means a force, torque or pressure change is detected in a hydraulic system. By the control a locking and/or unlocking of the Kelly bars is determined depending on the detected rotation angle and/or the detected change.

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