| 摘要 |
The boring device for making undercut bores in subsoil has a guide sleeve (2) and, under the tension of a torsion spring (6), an eccentric bush (4) rotatable relative to the guide sleeve (2). A drive shaft (8) mounted in the eccentric bush (4) and having a cutting head (9) can be put into an eccentric position relative to the guide sleeve (2) in order to produce a recess in the wall of the borehole. The rotary drive of the eccentric bush (4) is effected by the drive shaft (8) via eccentric gearing. In addition, a ring gear (23) is coupled via a wrap spring (31) to a gear housing (19). The wrap spring (31) can released from outside so that the eccentric bush (4) can be turned via the ring gear (23), gears (20, 21) connected to form a gearing block, and a further ring gear (24). …<IMAGE>… |
