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US 8,146,681 B2Granted
Drilling tool and drilling method
AssigneeHilti Aktiengesellschaft
InventorsKay Heemann, Uwe Bohn, Wolfgang Ludwig
Life of this patent
Estimating the term…
Abstract
A drilling tool includes a hydraulically driven device (21) for advancing a drilling head (2) in a bore (5), and a flow limiter (30) arranged in a hydraulic conduit (25) of the advancing device (21) for adjusting an advancing speed of the drilling head (2) in the bore (5), with the flow limiter (30) having a pressure-actuated adjusting member (38) for adjusting flow of a hydraulic fluid in the hydraulic conduit means (25) in accordance with a flow volume of a rinsing fluid (7) for rinsing the bore.
Claims10
A drilling tool, comprising:
- a drilling head (2) for forming a bore (5);
- a hydraulically driven device (21) for advancing the drilling head (2) in the bore (5);
- rinsing means (8, 11, 12) for rinsing the bore (5) with a rinsing fluid (7);
- a first flow limiter (30) arranged in hydraulic conduit means (25) of the advancing device (21) for adjusting an advancing speed with which the advancing device (21) advances the drilling head (2) in the bore (5), the first flow limiter (30) having a pressure-actuated adjusting member (38) for adjusting flow of a hydraulic fluid in the hydraulic conduit means (25) in accordance with flow of the rinsing fluid (7) in the rinsing means;
- means for transmitting pressure of the rinsing fluid to the adjusting member (38) and formed as at least one of mechanical, hydraulic and pneumatic element for actuating the adjusting member (38) in response to change of pressure of the rinsing fluid (7), and a second flow limiter (52) arranged in conduit means for rinsing means and having a pressure-actuated adjusting member subjectable to pressure of the hydraulic fluid.
2 more elements
A method of forming bores in rock formations, comprising the steps of:
- advancing a drilling head (2) in a bore (5) with a hydraulically driven advancing device (21);
- adjusting an advancing speed with which the advancing device (21) advances the drilling head (2) in the bore (5) with a first flow limiter (30) that adjusts flow of a hydraulic fluid;
- rinsing the bore(5) with a rinsing fluid (7);
- and
- subjecting a pressure-actuated adjusting member (38) of the flow limiter (30) to pressure of the rinsing fluid (7), and
- controlling a flow volume of the rinsing fluid with a force-operated second pressure limiter (52) dependent on pressure of the hydraulic fluid in hydraulic fluid conduit means (25).
3 more elements
Dependencies are inferred from the claim text.