公开(公告)号：WO2016164919A1

公开(公告)日：2016-10-13

申请号：PCT/US2016/026976

申请日：2016-04-11

Applicant: JOY MM DELAWARE, INC.

Inventor： FREDERICK, John, R. ,  BOSHOFF, Rudie

IPC: E21C35/18 ,  E21C35/19 ,  E21C25/18

CPC classification number: E21C35/197 ,  E21C25/10 ,  E21C35/18 ,  E21C2035/1826

Abstract: A cutting bit for a bit assembly secured to a cutter head includes a cutting end, a shank extending along a bit axis, and a shoulder positioned between the cutting end and the shank. The shoulder includes an outer edge defining a perimeter, a shoulder end surface defining a shoulder plane, a first inclined surface and a second inclined surface. The first inclined surface is positioned between the outer edge and the shoulder end surface. The first inclined surface extends along the perimeter and is oriented at a first acute angle relative to the shoulder plane. The second inclined surface is positioned between the shoulder end surface and the first inclined surface. The second inclined surface is oriented at a second acute angle relative to the shoulder plane, and the second acute angle is smaller than the first acute angle.

Abstract translation: 用于固定到刀头的钻头组件的切削刀头包括切削端，沿钻头轴线延伸的柄部以及位于切削端和柄之间的肩部。 肩部包括限定周界的外边缘，限定肩平面的肩端表面，第一倾斜表面和第二倾斜表面。 第一倾斜表面位于外边缘和肩端表面之间。 第一倾斜表面沿着周边延伸并且相对于肩平面以第一锐角取向。 第二倾斜面位于肩端面与第一倾斜面之间。 第二倾斜面相对于台肩平面成第二锐角，第二锐角小于第一锐角。