Ground-drilling device
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United States of America Patent
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May 3, 2016
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N/A
app pub date -
Apr 8, 2011
filing date -
Apr 16, 2010
priority date (Note) -
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Abstract
A ground-drilling device includes a basic body and a drill head movably mounted in relation thereto in the longitudinally axial direction, wherein a free space, which is variable in its size owing to the movable mounting, is formed between the drill head and the basic body, and a sealing element for sealing the free space with respect to the environment, wherein the sealing element is designed as a valve element which opens when an overpressure is present inside the clearance, in order to produce a pressure compensation, and which is closed when a negative pressure is present inside the clearance, in order to prevent a pressure compensation.
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