Patent EP-0178417-A1 (EP)
Inventor: WERTHWEIN GUSTAV
IPC: B23B29/04
Filed: 1985-08-18
Abstract: 1. Divisible tool (10) with the features : - there is present a basic member (11) which serves for the securing on a machine tool, and a tool head (12) which carries the cutting edge of the tool (14), - the basic member (11) and the tool head (12) are separable from one another and are connectable with one another by means of a coupling device (13), - the coupling device (13) has guide surfaces and clamping surfaces on the parts of the basic member (11) and of the tool head (12) which are movable relatively to one another, - the guide surface (16) on the basic member (11) is constructed as the peripheral surface of a guide hole (17) with straight parallel cylinder generator lines, - the guide surface (21) on the tool head (12) is constructed as the peripheral surface of a guide bolt (22) adapted to correspond thereto, - for the rotatable mounting of a clamping member (31) there is present on the basic member (11) a cylindrically circular guide hole (32) whose cylinder axis (33) - is aligned at right angles in relation to the longitudinal axis (18) of the guide bolt (22), - is spaced apart from the longitudinal axis (18) of the guide bolt (22), in the radial direction, by a distance which is equal to, or smaller than, the distance which separates the cylinder axis (29) of the clamping surface (28) from the longitudinal axis (18) of the guide bolt (22), and - is offset in the axial direction, in relation to the cylinder axis (29) of the clamping surface (28) on the guide bolt (22), by a certain amount (m) in the clamping direction, - on the guide bolt (22) of the tool head (12) the clamping surface (28) is constructed as a section of a cylindrically circular surface, - whose cylinder axis (29) is aligned at right angles to the longitudinal axis (18) of the guide bolt (22), - on the basic member (11), the clamping surface (38) is constructed as a part of the exterior surface of the clamping member (31), - the clamping member (31) has, in a longitudinal section whose length is at least equal to that of the longest cylinder generator line of the clamping surface (28) on the guide bolt (22), a flattened portion (34), - which is aligned parallel to the cylinder axis (33) of the clamping member (31), and - whose distance (n) from the cylinder axis (33) of the clamping member (31) is, at most, equal to that distance existing between the cylinder generator line (35) of the guide bolt (22) which is situated on the guide bolt (22) in the direction of traction beyond the clamping member (31) and is situated nearest to the clamping member in the radial direction, and the cylinder axis (33) of the clamping member (31), - on the clamping member (31), the clamping surface is formed by a peripheral ramp surface (38) which is adjacent on one edge (37) of the flattened portion (34), - and whose distance from the cylinder axis (33) of the clamping member (31) on the edge (37) of the flattened portion (34) has a minimum value, - this minimum value being, at most, equal to the minimum distance in relation to the place (35) of the guide bolt (22) which is situated nearest to the clamping member (31) in the direction of traction, and - whose distance from the cylinder axis (33) of the clamping member (31), viewed in the peripheral direction starting out from the edge (37) of the flattened portion (36), decreases constantly up to a maximum value, - this maximum value being at least equal to the maximum distance in relation to the place (35) of the guide bolt (22) which is situated nearest to the clamping member (31) in the direction of traction, - the clamping member (31) has on both sides outside the longitudinal section with the flattened portion (36) at least one cylindrically circular guide surface (39) which is adapted to correspond to the guide hole (32) on the basic member (11).