Rotatable cutting tool with notched radial fins

Abstract

A rotatable cutting tool for earth displacement equipment for maximizing penetration into hard rock during mining, trenching, drilling, or boring operations. The bit penetrator pocket protector for earth displacement equipment includes a body which defines an upper bit end and a lower shank end. The upper bit end defines a bit insert opening configured to detachably accept a penetrator bit tip. The lower shank end is configured to be securable to a penetrator holder that is welded to an implement of earth working equipment such as the chain excavator or a rotatable drum, or the like. A flange, or pocket protector, is defined between the upper and lower ends in order to provide protection for the bit penetrator lower end and a holder in which it is received by minimizing rock and earth fines from contacting and building up between the holder and bit penetrator. Further, the flange acts as a load bearing surface between the bit penetrator and the holder, thereby protecting the lower end of the bit penetrator and the face and bore of the holder. A plurality of fins are defined between the flange and the upper end in order strengthen the integrity of the bit penetrator. The fins allow for a reduced diameter upper end, as compared to the lower end, in order to enhance the cutting of the bit penetrator. In order to allow for a more fluid flow of material from the tip of the bit penetrator and out of the area being excavated, each fin defines a notched portion along the terminal edge thereof.