Machine with variable torque setting

US4923047A · kind A · utility

Assignee

• C. & E. FEIN GMBH · DE

Inventors

• Manfred Fink · Weinsberg, DE
• Wolfgang Schreiber · Stuttgart, DE
• Manfred Ludwig · Stuttgart, DE
• Ewald Hald · Echterdingen, DE
• Guenter Kloss · Stuttgart, DE

Key dates

• Filing date: Dec 15, 1988
• Grant date: May 8, 1990
• Expiry date: Dec 15, 2008

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H35/10
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A motor-driven machine with variable torque setting includes a motor, a planetary gearing driving a work spindle and a rotatably mounted internal gear actuating a motor de-energizer against the action of a spring force when a settable limit torque is exceeded. To achieve a compact design, a torsion spring element extending in the axial direction alongside the planetary gearing is provided for generating the spring force. The torsion spring element carries a swivel element at one end which engages a cam on the internal gear and is held at an opposite end in a support so that the swivel element can swivel out of an initial position against the action of the force of the torsion spring element to de-energize the motor.