Patent ID: 8117757

Claim:
A cutter adapter for connection with a cutter and a drive shaft of a cutting machine, said cutter having a tang having a lock hole, said cutter adapter comprising: a column-shaped holder having a first end and a second end, the second end being adapted for connection with said drive shaft, said holder having a first receiving portion, a second receiving portion, and a through hole, said first receiving portion having a first opening at an end surface of the first end for said tang of said cutter to pass through for connection with said first receiving portion, said through hole running through an external sidewall of said holder and a sidewall of said first receiving portion, said second receiving portion having a second opening running through a sidewall of said first receiving portion and a third opening at the end surface of the first end; a lock pin located in said through hole and being longer than said through hole, said lock pin being movable between a first position and a second position; when said lock pin is located at the second position, an end of said lock pin, facing said first receiving portion, is inserted into said lock hole of said cutter received in said first receiving portion; a sleeve having an annular convexity formed along an internal circumferential sidewall thereof and having an annular bevel, said sleeve being sleeved onto said holder and movable between a third position and a fourth position along a central axis of said holder; when said sleeve is moved from the third position to the fourth position, said annular bevel gradually forces said lock pin to move from the first position to the second position; a limit cap connected with the first end of the holder, having a larger external diameter than an internal diameter of said annular convexity, for preventing said sleeve from disengagement from said holder, said limit cap including an opening in communication with said first receiving portion and at least covering a part of said third opening of said second receiving portion; a biasing pin located in said second receiving portion and movable between a fifth position and a sixth position; when said biasing pin is located at the sixth position, an end of said lock pin, facing said first receiving portion, is stopped against on a proper of said biasing pin, and a biasing end of said biasing pin, facing the first end of said holder, is stopped against on said limit cap, whereby said lock pin is located at the first position; a first spring mounted between the sleeve and the holder for keeping said sleeve located at the fourth position; and a second spring mounted in said second receiving portion and having an end stopped against said biasing pin for keeping said biasing pin located at the sixth position.