| 摘要 |
1448378 Tool-bits ETABS MONTABERT 19 Dec 1973 [26 Dec 1972] 58999/73 Heading B4C A tool 2 is held in the tool-holder 1 of a percussive drill by a key 6 engaging a flat surface 4 in the tool shank. As shown, two keys 6 are provided and bores 9 in the ends of the slots allow the keys to be driven out when the tool is being disassembled. The reciprocating motions of the tool are limited by the curved ends 5 striking the curved edges 7 of the keys. |
