Patent · US Expired

Power driven hammer drill

US4446931A · kind A · utility

33Cited by

7References

22Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Manfred Bleicher
Manfred Buck · Jeffery Road, DE
Jorg Falchle · Neckartenzlingen, DE
Karl Wanner · Echterdingen, DE

Key dates

Filing date	Sep 14, 1981
Grant date	May 8, 1984
Priority date	—
Expiry date	Sep 14, 2001

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D11/062
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A power driven hammer drill has a tool impacting mechanism, a wobble unit for reciprocating the tool striking mechanism and having a drum member which can be releasably coupled with an intermediate shaft driven by a motor, wherein a switching device is provided outside of a hammer drill housing and arranged so as to disengage a coupling element of the intermediate shaft out of a coupling element of the drum member of the wobble unit against the action of a spring.

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