Patent ID: 6918716

Claim:
An internal broach for internally broaching profiles ( 12 ), defined by a bottom ( 14 ) and first and second flanks ( 15 , 16 ), of female serrations of a work piece ( 8 ), which broach comprises a shank ( 1 ), which leads in a direction of broaching ( 22 ); and a toothed section ( 2 ) with several rows ( 6 ) of broach cutting teeth ( 21 a to 21 f ), the rows ( 6 ) being disposed successively counter to the direction of broaching ( 22 ); wherein broach cutting teeth ( 21 a to 21 f ) are allocated to each other for broaching a profile ( 12 ) of a depth; wherein the broach cutting teeth ( 21 a to 21 f ) have bottom cutting blades ( 23 a to 23 f ) and first and second sides; wherein the bottom cutting blades ( 23 a to 23 f ) of successive and associated broach cutting teeth ( 21 a to 21 f ) have a pitch relative to the broach cutting teeth ( 21 a to 21 f ) which lead in the direction of broaching ( 22 ); wherein a bottom-cutting-blade relief surface ( 24 ) is allocated to the bottom cutting blades ( 23 a to 23 f ); and wherein the first and second sides pass through the bottom-cutting-blade relief surfaces ( 24 ) and form first and second edges; wherein the first sides are guide flanks ( 25 a to 25 f ) which have no relief or relief angle, whereby the first edges are the first flanks ( 15 ) forming guide edges without cutting ability and wherein the second sides, at least in proximity to bottom cutting blades ( 23 a to 23 f ), are flank-cutting-blade relief surfaces ( 28 a to 28 f ), the second edges, by allocation to the bottom cutting blades ( 23 a to 23 f ), being flank cutting blades ( 27 a to 27 f ) with cutting ability.