Patent · US Expired

Tool for drilling and/or chiseling

US5975217A · kind A · utility

42Cited by

7References

6Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Jens Frenzel · Fürstenfeldbruck, DE
Helmut Nussrainer · Isen, DE
Reinhard Schulz · Hannover, DE
Hans-Werner Bongers-Ambrosius · Munich, DE

Key dates

Filing date	Apr 7, 1998
Grant date	Nov 2, 1999
Priority date	—
Expiry date	Apr 7, 2018

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D11/005
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A tool for drilling and/or chiseling has a striking mechanism (6) within a guide tube (9) for reciprocating a first piston (7) and, via an air cushion, for reciprocating a second piston (19) within the guide tube. The second piston drives a driving anvil (17) in the driving direction. Between the first and second pistons (7, 19) the guide tube (9) has a series of radially extending first air passages (10) arranged in a first plane (E1) extending perpendicularly of the driving direction. A control body can be shifted over the guide tube (9) and is connected to the driving anvil (17). The guide tube (9) has a second series of radially extending second air passages (11) therethrough arranged in a second plane (E2) spaced from the first plane (E1) at a distance (A) opposite to the driving direction.

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