Patent ID: 7083367

Claim:
An adapter device for holding a blade having a first and a second side onto a distal end of a holder of a spade drill, said adapter comprising: a body of generally cylindrical configuration, said body having a first and a second extremity, said body defining a first flute and a second flute disposed diametrically opposite to said first flute, said body also defining a bore which extends from said second extremity of said body for the flow therethrough of coolant, said body further defining a first and a second branch bore, said branch bores extending from said bore to said first extremity of said body; said second extremity of said adapter removably cooperating with the distal end of the holder; said first extremity of said body defining a diametrical slot disposed between said flutes for the replaceable reception therein of the blade such that coolant flowing through said first branch bore is directed towards the first side of the blade and coolant flowing through said second branch bore is directed towards said second side of the blade; said second extremity of said body defines a diametrically extending ridge; an extension extending away from said ridge; the distal end of the holder defining a channel and a chamber for the removable reception therein of said ridge and said extension respectively; and a fastener for fastening said extension within said chamber such that in use of said adapter device, when the holder is rotated, said ridge and said channel cooperate with each other to drive said body and the blade secured thereto.