| 摘要 |
FIELD: mining. ^ SUBSTANCE: invention refers to drilling equipment and can be implemented as drilling tool for bore making of various purposes by rotating cutting-shearing destruction of rock bottom. The drilling head consists of a holder in form of a round rod with a water supply aperture and with several cylinder projections with external thread cut thereon; this thread meshes with the thread of cutters made integral with expanding cutting tools not less, than three around the circumferential cutting path. The holder is also equipped with support slotted bushings in form of two halves enveloping the latter; the said halves are drawn together with wire coils and are installed inside cylinder slotted springs. The slotted spring operates as a tensile axial support for the cutter with extending cutting tools. With its one end the holder is connected to a drilling rod while with another rod it is connected with the advancing cutting tool-starter. ^ EFFECT: upgraded efficiency of boring. ^ 4 dwg |
