Device for clamping workpiece to a surface

US6308943A · kind A · utility

Assignee

• A. Römheld GmbH & Co. KG · DE

Inventors

• David Fischer · Breunigweiler, DE
• Rudolf Kohlert · Riedstadt, DE

Key dates

• Filing date: Apr 24, 2000
• Grant date: Oct 30, 2001
• Expiry date: Apr 24, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25B5/087
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A clamping tool holds a workpiece in place on a surface, for example in a machine tool, by a clamping bolt (2) which is moved into a workpiece contacting position by a locking piston (6). The bolt (2) and the piston (6) are slidable in respective bores (3, 4) in a housing (1) in which the clamping bolt (2) is locked in a workpiece supporting position by the locking piston (5, 6). For this purpose the locking piston (6) has a piston rod (5) with a wedging incline (8) cooperating with a respective wedging incline (2') at an inner end of the clamping bolt (2). A tongue and groove combination is provided between the piston rod (5) and the inner end of the clamping bolt to facilitate the cooperation and force transmission between the piston rod (5) and the clamping bolt (2). A self-locking effect holds the locking piston in a working position until the self-locking effect is released.