Patent ID: 8540320
Filing Date: 2013-09-24
Classification: B28D,E21C

Abstract:
1. A bit holder for use in road milling, trenching and mining equipment as part of an assembly including a bit, said bit holder and a bit block, said bit being mountable in a first bore through said bit holder and extending completely therethrough and said bit holder being mountable in a second bore through said bit block, said bit holder comprising: a front portion and at least one generally cylindrical shank portion extending axially rearwardly from said front portion defining an annular side wall, an elongate slot radially through said side wall extending axially from a distal end of said shank and terminating between said distal end and said front portion defining at least one angular segment of said shank being less than 360 degrees in circumferential length, an outer surface of said angular segment providing interference with said second bore on said bit block sufficient to maintain said bit holder in said bit block during use, and said bit holder bore including an outwardly radially extending taper substantially the length of said elongate slot and positioned adjacent thereto, said taper providing a space between said bit shank and said bit holder bore for said bit holder shank to collapse into when said holder is inserted into said bit block, while allowing said bit shank to maintain a rotatable mounting thereon.