Device for connecting the bits with the cutting head of a drift advancing machine or the like

摘要

A drift advancing machine or the like having a cutting head with replaceable bits. Each bit is disposed in a sleeve-shaped bit holder fixed to the cutting head. Arranged at an oblique angle to the axis of each bit is a pivotal locking bolt having a first pivotal position wherein it engages a recessed portion of the bit and prevents removal of the bit, and a second pivotal position wherein it is out of engagement with the recessed portion of the bit and allows removal of the bit. The front end of the locking bolt is shaped particularly for engagement with the bit recessed portion.