Fixture and clamping housing

Abstract

In a fixture (1) by means of which a workpiece (2) to be machined is held on a tool table (3) of a machine tool (4), comprising: a housing (10) into which a passage opening (11) is worked, in which a clamping pin (12) is inserted for supporting the workpiece (2) on the housing (10) of the fixture (1), a fastening screw (14) engaging in the passage opening (11) by means of which the housing (10) is fixed onto the tool table (3) in an oriented position, a driving ring (15) mounted in the housing (10) in a rotating arrangement which is in a driving active connection with a driving spindle (20) inserted in the housing (10), by means of which the driving ring (15) can be moved about the longitudinal axis (11′) of the passage opening (11) within a specified angle range (α), and at least two locking pins (18) facing the longitudinal axis (11′) of the passage opening (11), mounted in the housing (10) in such a way as to allow radial movement and each of which is in a driving connection with the driving ring (15), and by means of which the clamping pin (12) is locked in the passage opening (11) of the housing (10) in the clamped condition and/or is released in the initial condition, the conversion of the rotational movement of the driving ring (15) into a radial advance movement for the locking pins (18) used should take place without play and with at least two different ratios. This is achieved in that a control surface (21) or control cam with at least two different pitches (22, 23) is worked onto the inside (16) of the driving ring (15) in each area of the locking pins (18), that an accommodating pocket (19) with a U-shaped cross section is worked into the corresponding locking pins (18) into which the driving ring (15) engages, and that a contact surface (25) is worked onto or provided on the wall of the locking pin (18) facing the inner wall (16) of the driving ring (15) and the contact surface (25) is in contact with the control surface (21) or control cam of the driving ring (15) and moves the corresponding locking pin (18) radially inwards or outwards depending on the direction of rotation of the driving ring (15).

Dependencies are inferred from the claim text.