SAETT OCH TILLSATSAGGREGAT TILL GRAEVMASKIN or corresponding Foer ATT APPLICERA LAONGSTRAECKTA ELEMENT I BLOCK OCH STENARINNEHAOLLANDE MARK

摘要

The post-hole boring rig is for attachment to an excavator deploys a massive driven cutting tube (5) with a linear cutting-edge and is partic. for use in stony soils. The cutting tube is attached to an overhead drop-hammer (4) which is in turn mounted to slide down a vertical mast (2). The mast may be attached to an excavator and may inc. a winch (9, 10) with power-feed couplings. The cutting tube may be used independently or with guide tube (6). In the latter case the cutting tube and the guide are driven together with the former entering the latter. A radial shoulder (5a) at the head of the cutting tube engages the head of the guide (6) during each driving stroke, and the cutting tube projects beneath the guide by a distance not exceeding half the cutting tube dia.