| 摘要 |
1. Mining device for mining mineral materials, especially for mining coal, consists of a bit with a gripping part and the bit grip, with a fixing element, which fits to the bit grip. The bit grip contains an insertion opening, while the gripping part of the bit contains a setting opening with clamping elements for securing a mandrel bolt. The openings are positioned transversally with respect to the bit grip and the gripping part of the bit, and they are in line, when the mandrel bolt is introduced. The gripping part of the bit contain at least two openings, that run orthogonally across and through the setting opening, in the threaded zone prepared for the bolt screw. Characterized in that: Hard-elastic pressed-out inserts (14) are secured in the round openings (13) opposite to each other. The inserts protrude to a definite height into the setting opening (6) of the gripping part (2) of the bit. They constitute a bilateral fitted mounting (15) of the gripping part (2) of the bit in the bit grip, as they are pressed to the fixing element (4) of the bit grip (3). |
