Patent · US Expired

Pneumatic hammer having a safety device

US4359108A · kind A · utility

0Cited by

2References

3Claims

0Family size

Assignee

VEB Werkzeugkombinat Schmalkalden · DE

Inventors

Gerd Radtke · Berlin, DE
Klaus Heerde · Berlin, DE
Hans Joachim Steiner · Bremen, DE
Klaus Mechelke · Berlin, DE

Key dates

Filing date	Mar 31, 1980
Grant date	Nov 16, 1982
Priority date	—
Expiry date	Mar 31, 2000

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D9/265
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A pneumatic hammer having a vibration attenuating hollow cylindrical member axially movable in a housing body, a striking piston axially movable within the cylindrical member, a stationary sealing sleeve engaging a portion of the outer surface of the cylindrical member, inlet air control means including an inlet passage in the wall of the cylindrical member, a slidable pressure ring cooperating with a pressure spring for urging the cylindrical member into a rest position in which the inlet air control means are disconnected from the inlet air channel and are connected instead to an outlet air channel in the housing body. Upon lifting the cylindrical member via a working tool, the passage to the outlet air channel is closed and the passage from the inlet air channel to the inlet air control means is opened and a normal operation of the hammer is initiated.

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