Collet for a square-shank tap

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 31/20 (2006.01)

Patent

CA 2165464

A collet (10) is designed for a tool (200) having a cylindrical shank (202) and a square drive (204) at the rearward end of the cylindrical shank. The collet inludes a collet body (12) having a plurality of radially compressible collet segments (30). An axial bore (20) is formed in the collet body (12) for receiving the cylindrical shank (202) of the tool (200). The tool (200) is secured in the axial bore (20) by collapsing the collet segments (30) around the cylindrical shank (202) of the tool (200). A grip-forming slot (40) extends through a midsection (24) of the collet body (12) and communicate with the axial bore (20) so as to receive the square drive (204) of the tool (200) when the tool (200) is inserted into the axial bore (20). A pair of gripping surfaces (42) are formed on respective collet segments (30) on opposite sides of the grip-forming slot (40) for gripping opposed surfaces of the square drive (204) when the collet segments (30) are radially collapsed to prevent radial movement of the tool (200).

Douille de serrage (10) conçue pour un outil (200) possédant une queue cylindrique (202) et un carré d'entraînement (204) à l'extrémité arrière de la queue cylindrique. La douille comprend un corps (12) possédant une série de segments (30) de douille radialement compressibles. Un trou axial (20) est pratiqué dans le corps de la douille (12) afin de recevoir la queue cylindrique (202) de l'outil (200). L'outil (200) est fixé dans le trou axial (20) en affaissant les segments de douille (30) autour de sa queue cylindrique (202). Une fente de serrage (40) s'étend dans la section médiane (24) du corps de la douille (12) et communique avec le trou axial (20) de manière à recevoir le carré d'entraînement (204) de l'outil (200) lorsque ce dernier est inséré dans le trou axial (20). Deux surfaces de serrage (42) se trouvent sur les segments de douille correspondants (30) sur les côtés opposés de la fente de serrage (40) afin de saisir les surfaces opposées du carré d'entraînement (204) lorsque les segments de douille (30) sont affaissés radialement en vue d'empêcher le déplacement radial de l'outil (200).

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