Patent · US Expired

Machine tool

US4223579A · kind A · utility

10Cited by

4References

30Claims

0Family size

Assignee

Gerhard Stark · DE

Inventors

Gerhard Stark · Althengstett, DE
Gunther Blum · Ravensburg, DE

Key dates

Filing date	Jan 8, 1979
Grant date	Sep 23, 1980
Priority date	—
Expiry date	Jan 8, 1999

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T408/37
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The turret machine tool comprises a set of tool spindles which are driven via a built-in transmission gears by a direct current motor having a relatively stable torque in a wide range of rotational speeds such as a multiple direct current motor having permanent magnetic field and further including means for electrically controlling the speed of the motor according to a predetermined numerically controlled program.

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