| 摘要 |
A tool holder having a cut-out portion in its forward end which is to defined as a generally flat surface for supporting the bottom surface of a tool bit over the entire area of the flat surface and an upstanding side wall for engaging a substantial portion of the side surface of the tool bit. A retaining pin is rockingly mounted on the tool holder with the upper end projecting out of the flat surface and being received of a hole of the tool bit. The lower end portion of the retaining pin is urged laterally with respect to the longitudinal axis of the pin by a tightening screw whereby the tool bit is urged against the upstanding side wall. |
