Patent · US Expired

Electrically driven hammer machine

US4601351A · kind A · utility

7Cited by

5References

3Claims

0Family size

Assignee

Institut Cerac S.A. · CH

Inventors

Carl S. M. Hartwig · Täby, SE
Sven H. Johansson
Erik A. Ljung · Stockholm, SE

Key dates

Filing date	Sep 14, 1983
Grant date	Jul 22, 1986
Priority date	—
Expiry date	Sep 14, 2003

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D11/125
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

An electrically driven hammer machine comprising a driving piston (103) and a hammer piston (104) driven by the driving piston via a pressure gas cushion (106). The driving piston is driven by a brushless alternating current motor (101) via a crank mechanism (105). A solid state inverter (107) in the power supply conduit (102) supplies power of variable amplitude and frequency to the motor.

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