Metal cutting tools with replacement insert

A metal cutting tool comprising an elongated tool shank having a cutting end formed at one end thereof;

• an elongated pocket formed in the cutting end and being longitudinally directed with respect to the tool shank;
• wall means of said pocket including a longitudinally directed side wall adjacent a longitudinally directed side surface of said shank;
• a pair of axially directed pocket surfaces angularly directed with respect to each other and defining between them a first elongated corner means, at least one of said pocket surfaces being located on said side wall;
• an elongated cutting insert comprising an elongated intermediate portion of said insert, a pair of cutting portions of said insert extending substantially colinearly from either end of said intermediate portion, each cutting portion being formed with respective longitudinally transversely directed cutting edges, said insert being receivable and invertible in said pocket so that at any time one cutting portion extends beyond the cutting end and the other cutting portion and the intermediate portion are retained within the pocket;
• said intermediate portion having a pair of elongated insert surfaces angularly directed with respect to each other and defining between them a second elongated corner means which mates with said first elongated corner means so that when either of said cutting portions extend beyond the cutting end, the longitudinally directed cutting edge thereof is substantially parallel to and slightly offset with respect to an outer surface of said side wall;
• and clamping means mounted on said shank and adapted to exert a transversely directed clamping force on said cutting insert, said force having orthogonally directed components which respectively clamp the insert surfaces against the respective pocket surfaces;
• the cross-sectional dimensions of said cutting end with the cutting insert clamped in position being such as to enable said cutting end to pass through a bore nominally large enough to admit said tool shank therethrough.