Clamping device

US7473060B2 · kind B2 · utility

Assignee

• Ott-Jakob Spanntechnik GmbH · DE

Inventors

• Peter Mohr · Waiblingen, DE
• Wolfgang Bechteler · Biessenhofen, DE
• Stephan Gast · Schwabsoien, DE
• Josef Greif · Friesenried, DE
• Conrad Rösch · Pfronten, DE

Key dates

• Filing date: Jan 22, 2008
• Grant date: Jan 6, 2009
• Expiry date: Jan 22, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T409/309464
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The subject matter of the present invention relates to a clamping device for clamping a tool or a tool holder (2) in a machine spindle (1), comprising a drawbar (6) that can axially move back and forth between a clamping position and a release position, a clamping spring (18) for actuating the drawbar (6) in the direction of the clamping position, a minimum of one sensor (20) for monitoring the clamping force, and a clamping cone (8) having a plurality of clamping elements (9) that rest against its outside surface, which clamping elements, via the axial movement of the clamping cone (8) by means of the drawbar (6), can be moved back and forth between a clamping position in which the tool or tool holder (2) is retained and a release position in which the tool or tool holder (2) is released. To make possible an easy and reliable transmission of the measured data acquired by the sensor throughout the operating range of the clamping device, a transponder assembly (26, 27) with a stationary stator ring (27) and a rotor ring (26) that can be axially moved by the lifting movement of the drawbar (6) within the stator ring (27) is dedicated to the sensor (20) for the wireless transmission o…