Drill drive device for an earth drilling apparatus
AssigneeEURODRILL GmbH
InventorTobias MOSCARITOLO
Life of this patent
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Abstract
The invention relates to a drill drive device (10) for an earth drilling apparatus with a spindle arrangement which has an inner spindle unit (20) and an outer spindle unit (40) that is supported in an axially displaceable manner on the inner spindle unit (20) and floating between two spring means (50, 60). According to the invention provision is made in that a first front spring means (50) which is arranged on a drilling tool side comprises a combination of at least a compression coil spring and a first disk spring arrangement (54) and in that a second rear spring means (60) which faces away from the drilling tool side has a second disk spring arrangement (64).
Claims11
Drill drive device for an earth drilling apparatus with a spindle arrangement which has an inner spindle unit and an outer spindle unit that is supported in an axially displaceable manner on the inner spindle unit and floating between two spring means,
- wherein
- a first front spring means which is arranged on a drilling tool side comprises a combination of at least a compression coil spring and a first disk spring arrangement and
- a second rear spring means which faces away from the drilling tool side has a second disk spring arrangement.
Dependencies are inferred from the claim text.