| 摘要 |
<p>The invention refers to a device for the obtention of annular cavities at the bottom of drills made on surfaces of any kind. …<??>The apparatus, which may be coupled to any motor element as a conventional drilling machine, incorporates an axle of a considerable length, edged in a cutter, provided with a rotating movement, which axle is housed in a cylindrical piece, in a sharply eccentric mode, said piece also receiving a rotating element with respect to the fixed body, of the apparatus in its whole, so that the cutter and the fixed body remain perfectly coaxial when introduced in the drill, and by rotating the cutter at a high speed, a slow rotating movement of the casing piece determines the progressive eccentricity of the cutter with respect to the fixed body, for the obtention of the annular cavity which is pursued. On the fixed body itself, in parallel with the axle of the cutter, and to the moving piece which houses it, is set forth a conduct for the refrigeration water of said cutter.</p> |
