Combination of a tool holder and a tool

A tool holder comprising radially movable gripping members defining an axial shank receiving passage therebetween for receiving a shank portion of a tool therein, the gripping members and the shank portion of the tool defining cooperating male and female retainers for releasably retaining the shank portion of the tool within the shank receiving passage of the tool holder, the female retainer comprising an annular channel for receiving the male retainer therein;

• and
• the gripping members of the tool holder further defining first torque transmitting surfaces positioned adjacent to the male and female retainers for transmitting a driving torque from the tool holder to a shank portion of a tool received therein.

A tool holder comprising three radially movable gripping members defining an axial shank receiving passage therebetween for receiving a shank portion of a tool therein, the gripping members and the shank portion of the tool defining cooperating male and female retainers for releasably retaining the shank portion of the tool within the shank receiving passage of the tool holder, the female retainer comprising an annular channel for receiving the male retainer therein;

• and
• each of the gripping members of the tool holder defining a substantially flat first torque transmitting surface for transmitting a driving torque from the tool holder to a shank portion of a tool received therein, and said first torque transmitting surface defining said shank receiving passage of said tool holder.

A tool for use in a tool holder, said tool comprising a shank portion defining a male retainer for cooperating with a corresponding female retainer of the tool holder, the female retainer comprising an annular channel for receiving the male retainer therein;

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• the shank portion of the tool comprising a section having a polygonal cross-section and defining substantially flat side surfaces serving as torque transmitting surfaces positioned immediately adjacent to the male retainer defined by the shank portion for cooperating with torque transmitting surfaces formed on radially movable gripping members of the tool holder.

A tool holder comprising radially movable gripping members defining an axial shank receiving passage therebetween for receiving a shank portion of a tool therein, the gripping members and the shank portion of the tool defining cooperating male and female retainers for releasably retaining the shank portion of the tool within the shank receiving passage of the tool holder, the female retainer comprising an annular channel for receiving the male retainer therein;

• the gripping members of the tool holder comprising first torque transmitting surfaces for transmitting a driving torque from the tool holder to a shank portion of a tool received therein;
• and
• wherein the female retainer is defined by inner surfaces of the tool holder defining the shank receiving passage, the female retainer comprising an annular channel having an axial width substantially exceeding an axial extension of the cooperating male retainer formed on the shank portion of the tool to be received in the shank receiving passage.