公开(公告)号：US4938291A

公开(公告)日：1990-07-03

申请号：US272466

申请日：1988-11-17

Applicant: Gerald D. Lynde ,  James M. Price

Inventor： Gerald D. Lynde ,  James M. Price

IPC: B23B5/16 ,  E21B29/00

CPC classification number: E21B29/002 ,  B23B5/16 ,  B23B5/168 ,  Y10T408/81 ,  Y10T408/8595 ,  Y10T82/128

Abstract: A cutting tool (22) having elongate cutter arms (36) mounted about a pivot pin (40) for outward swinging movement. Cutting blades (58, 60) are mounted on the lower ends of the cutter arms (36) and have a plurality of closely fitting hard carbide cutting elements (90) secured thereto and forming an inclined leading planar cutting surface (82) inclined from the upper end of the associated blade (58, 60) at an angle A between one (1) degree and twenty (20) degrees relative to the direction of rotation. The cutting elements (90) have parallel rear and front faces (90A, 90B) connected by a peripheral side surface (90C) extending perpendicularly to the parallel faces (90A, 90B). Several embodiments of pivotally mounted cutter arms (36, 36A, 36B, and 36C) are illustrated including various blades (58, 60, 58F, 60F, 116, and 114) having a plurality of closely fitting cutting elements arranged thereon in a plurality of longitudinally and transversely extending rows for forming the leading inclined planar cutting surface.

Abstract translation: 切割工具（22）具有围绕枢轴销（40）安装的用于向外摆动的细长切割臂（36）。 切割刀片（58,60）安装在刀臂（36）的下端，并且具有固定在其上的多个紧密配合的硬质合金切割元件（90），并形成倾斜的前导平面切割表面（82） 相关联的叶片（58,60）的上端相对于旋转方向以一（1）度和二十（20）度之间的角度A。 切割元件（90）具有通过垂直于平行面（90A，90B）延伸的周边侧表面（90C）连接的平行的后表面和前表面（90A，90B）。 示出了枢转安装的刀具臂（36,36A，36B和36C）的几个实施例，其包括具有多个紧密配合的切割元件的多个叶片（58,60,58F，60F，116和114） 纵向和横向延伸的行，用于形成前倾斜平面切割表面。