Patent ID: 6966729

Claim:
A tangential reversible cutting blade, comprising: a prismatic body which is bordered by two opposed, identically shaped first surfaces ( 12 , 14 ) and four identically shaped, interposed lateral surfaces ( 20 ), four equal-length main cutting edges ( 28 ) on each of the first surface ( 12 , 14 ) which are defined with one lateral face ( 20 ) each, a raised web ( 22 ) on each lateral surface ( 20 ) with the four webs being symmetrical with a central plane ( 18 ) through the lateral surfaces ( 20 ), a through mounting bore ( 16 ) coaxial with the axis through the centres of the first surfaces ( 12 , 14 ), metal-cutting faces on the lateral surfaces ( 20 ) which are defined by fillets ( 24 , 26 ) adjacent to the main cutting edges ( 28 ) on either side of the associated web ( 22 ), and cutting-tool flanks on the first surfaces ( 12 , 14 ) which are defined by a spherical surface shape ( 30 ) of the first surfaces ( 12 , 14 ) adjacent to the main cutting edges ( 28 ).