Toothed tool coupling for metal cutting devices

In combination:

• a stationary metal cutting tool holder having at least one seat for receiving a cutting insert;
• a mounting body for carrying the tool holder;
• and
• a securing element for securing the tool holder to the mounting body;
• the tool holder including a first coupling part defining a center axis, and the mounting body including a second coupling part arranged coaxially with the first coupling part;
• the first and second coupling parts being conical as viewed in a longitudinal section plane containing the axis, and being arranged one inside of the other,
• the first coupling part including teeth spaced circumferentially apart about the axis and projecting generally radially with respect to the axis, the teeth received in respective radially-open circumferentially spaced recesses formed in the second coupling part;
• each of the teeth terminating in an axially facing wall and including a sidewall contacting a sidewall of the respective recess, a curvature of the tooth sidewall being different from a curvature of the recess sidewall at locations where those sidewalls contact one another, wherein such contact is in the form of a point contact on each side of a generally radial line of symmetry of the respective tooth as viewed in a direction parallel to the axis;
• each of the contact points being operable to transmit a restraining force from the second coupling part to the first coupling part in a respective direction;
• each of the contact points defining a tangent line, wherein the restraining force is transmitted along a line of force oriented perpendicular to a respective tangent line;
• wherein a restraining angle is formed between the line of symmetry and each tangent line, each restraining angle being in the range of −5° to +45°;
• wherein the securing element comprises a screw extending along the axis.

In combination:

• a stationary metal cutting tool holder having at least one seat for receiving a cutting insert;
• a mounting body for carrying the tool holder;
• and
• a securing element for securing the tool holder to the mounting body;
• the tool holder including a first coupling part defining a center axis, and the mounting body including a second coupling part arranged coaxially with the first coupling part;
• the first and second coupling parts being conical as viewed in a longitudinal section plane containing the axis, and being arranged one inside of the other,
• the first coupling part including teeth spaced circumferentially apart about the axis and projecting generally radially with respect to the axis, the teeth received in respective radially-open circumferentially spaced recesses formed in the second coupling part;
• each of the teeth terminating in an axially facing wall and including a sidewall contacting a sidewall of the respective recess, a curvature of the tooth sidewall being different from a curvature of the recess sidewall at locations where those sidewalls contact one another, wherein such contact is in the form of a point contact on each side of a generally radial line of symmetry of the respective tooth as viewed in a direction parallel to the axis;
• each of the contact points being operable to transmit a restraining force from the second coupling part to the first coupling part in a respective direction;
• each of the contact points defining a tangent line, wherein the restraining force is transmitted along a line of force oriented perpendicular to a respective tangent line;
• wherein a restraining angle is formed between the line of symmetry and each tangent line, each restraining angle being in the range of −5° to +45°;
• wherein the conical shape of the first and second coupling parts are defined by a cone angle of from 1° to 30°.