Collet and lock nut assembly

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 31/20 (2006.01)

Patent

CA 2598446

A collet and lock nut assembly (10) includes a collet (12) for receiving a cutting tool shank (16) and a lock nut (14) for creating a gripping force between the collet (12) and the shank (16). The collet (12) has a nose portion (24) and a body portion (26) separated by an annular groove (28). The lock nut (14) has a concentric bore (48) with a plurality of retention tabs (72) and a corresponding number of clear portions (74). The collet and lock nut assembly (10) can be easily assembled by inserting at least one retention tab (72) within the groove (28) of the collet (12), and then applying pressure to the collet (12) such that the remaining retention tabs (72) of the lock nut (14) are received within the groove (28) of the collet (12) to place the assembly (10) in a locked position. The collet (12) and cutting tool shank (16) can be drawn from the tool holder (18) by applying rotational torque to the lock nut (14). The collet (12) is easily removed from the lock nut (14) by applying pressure in any circumferential, lateral direction against the collet (12).

L'invention concerne un ensemble collet-écrou de blocage(10) qui comprend un collet (12) recevant le flanc d'un outil de coupe (16) et un écrou de blocage (14) créant une force de préhension entre le collet (12) et le flanc (16). Le collet (12) comporte une partie avant (24) et une partie corps (26) séparées par une gorge annulaire (28). L'écrou de blocage (14) comporte un alésage concentrique (48) pourvu d'une pluralité de languettes de retenue (72) ainsi que d'un nombre correspondant de parties évidées (74). L'ensemble collet-écrou de blocage (10) peut être facilement monté par l'introduction d'au moins une languette de retenue (72) dans la gorge annulaire (28) du collet (12), puis par l'application d'une pression au collet (12) de sorte que les languettes de retenue (72) restantes de l'écrou de blocage (14) se logent dans la gorge (28) du collet (12), plaçant ainsi l'ensemble (10) en position de blocage. Le collet (12) et le flanc de l'outil de coupe (16) peuvent être enlevés du porte-outil (18) par application d'un couple à l'écrou de blocage (14). Le collet (12) est facilement retiré de l'écrou de blocage (14) par application d'une pression dans n'importe quelle direction circonférentielle, latérale contre le collet (12).

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