Patent · US Expired

Hand-held tool with switching means for variable operation

US4898250A · kind A · utility

14Cited by

4References

27Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Anton Neumaier · Fürstenfeldbruck, DE
Uto Plank · Freising, DE
Gerhard Rumpp · Herrsching am Ammersee, DE

Key dates

Filing date	Dec 17, 1987
Grant date	Feb 6, 1990
Priority date	—
Expiry date	Dec 17, 2007

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D2217/0049
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

In a hand-held tool having a tool holder for receiving a variety of tool bits, a probing device is provided for checking the surface configuration of the shank of a tool bit inserted into the tool holder. The probing device includes at least one control element arranged to move radially inwardly through an opening in the tool holder. If the control element moves radially inwardly into an axially elongated recess in the tool bit shank, it moves out of stopping engagement with a slide permitting the slide to move relative to the control element and initiating a switching operation for changing the driving action of the hand-held tool.

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