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US 4,396,072 AGranted
Method and apparatus for producing a drill hole
AssigneeWirth Maschinen-und Bohrgerate-Fabrik GmbH
InventorsGeorg Hurtz, Willi Steufmehl
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AssigneeWirth Maschinen-und Bohrgerate-Fabrik GmbH
InventorsGeorg Hurtz, Willi Steufmehl
Estimating the term…
Producing a vertical or inclined drill hole by full profile drilling taking place upwardly from a starting location and utilizing a rotatable and displaceable drilling tool and a train of drilling rods which lead to the drilling tool, wherein the drilling tool is, together with the train of drilling rods, subjected, in the vicinity of the upper end of the train of drilling rods, to a force applied in the feed direction, at least part of the reaction of this force being transmitted to a counterabutment which can be releasably secured in the drill hole, and the driving torque for the drilling tool being produced at the starting location and mechanically led from there to the drilling tool.
A method of producing a drill hole by full profile drilling in the upward direction utilizing a rotatable and displaceable drilling tool and a train of drilling rods connected at the lower end to a rotating drive device and leading to the drilling tool at the upper end, comprising applying a first fluid pressure force to said drilling tool in the feed direction thereof from the lower end of and through the train of drilling rods, applying a second fluid pressure force in said feed direction to said drilling tool through a second force applier in the vicinity of the upper end of said train of drilling rods, dividing said second fluid pressure and feeding a part thereof to a clamping unit to thereby releasably clamp said second force applier in the drill hole, and regulating said part of said fluid pressure applied to said clamping unit so that when said second fluid pressure force at the drilling tool reaches a predetermined amount, said part of said second fluid pressure fed to the clamping unit actuates said clamping unit to clamp said second force applier, and when said second fluid pressure force at the drilling tool is below said predetermined amount said clamping unit is released.
Apparatus for producing an underground drill hole by full profile drilling comprising a base member adapted to be supported below the hole to be drilled, first feed means mounted on said base member for producing an upwardly directly feeding force, rotary drive means, a train of drilling rods comprised of a plurality of interconnectable parts extending upwardly and operably engaging at the lower end said first feed means and said rotary drive means so that said train of drilling rods can be rotated and displaced upwardly thereby, a drilling head operably engaging the upper end of said train of drilling rods to be rotatably driven and displaced upwardly thereby, a bearing housing rotatably mounted on said drilling head, and second feed means comprising a supporting body attached to said bearing housing, said train of drilling rods extending rotatably through said supporting body, a slide member non-rotatably and slidably mounted on said support member for guided movement in the direction of feed of said drill head, a clamping unit mounted on said slide member comprising fluid pressure operated clamping means for releasably clamping said slide member to the wall of the drill hole, double-acting fluid pressure operated piston and cylinder feed means connected at one end to said bearing housing and at the other end to said slide member to displace said members with respect to each other, a source of fluid pressure, and means to operably connect said fluid pressure source to said piston and cylinder means and to said fluid pressure operated clamping means.
Dependencies are inferred from the claim text.