| 摘要 |
The holder for the bit of a mining machine has a chamber with an open side for introduction of the shank of the bit. The shank fills the chamber and one of its lateral surfaces has a longitudinally extending groove whose height and/or width decreases from a front opening to a rear opening of the holder. The groove is filled by the stem of a key which holds the shank in the chamber. The rear end of the stem extends into the rear opening, and the front end of the stem extends forwardly through and beyond the front opening and carries a head which facilitates extraction or expulsion of the key.
|
