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(11) | EP 1 614 853 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Telescoping auger drill |
| (57) A continuous-screw drilling equipment for drilling the ground having an extension
rod with at least two sections of rod of the type in which the continuous screw constituting
the tool is carried by an extension rod which is able to slide along a motor assembly
from which it receives the rotary motion about a longitudinal axis thereof; the extension
rod is made up of at least two coaxial sections or stretches of rod, of which the
internal one (4) is without turns and is rigidly connected at the bottom end to the
continuous-screw tool (5), whilst the external one (6), which is able to slide on
the internal one (4) and along the motor assembly (3), has some turns constituting
the screw (7) in the bottom area, the rods (4 and 6) being equipped with splined couplings
for connection with one another, and the external rod (6) is in turn equipped with
a splined coupling also with respect to the motor (3) so as to transmit the rotary
motion from the motor to the respective screw (5 and 7).
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