Patent ID: 11939821
Assignee: BAUER MASCHINEN GMBH
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A Kelly bar arrangement for a drilling apparatus, in particular an earth drilling apparatus, with a tubular outer Kelly bar, which is designed for bearing on a drill drive and for receiving a drilling torque of the drill drive, and
with an inner Kelly bar, which is displaceably supported inside the outer Kelly bar and has a rope suspension, wherein the drilling torque can be transmitted between the outer Kelly bar and the inner Kelly bar,
at least one line is included on the inner Kelly bar,
wherein
in a lower or upper end region of the inner Kelly bar a rotary feedthrough with a first attachment section and a second attachment section is arranged, wherein the first attachment section is connected to the rotationally drivable inner Kelly bar and forms a line connection to the at least one line of the inner Kelly bar and the second attachment section is connected to a supply line, the supply line being stationary relative to the rotationally drivable inner Kelly bar,
wherein
on the rotary feedthrough, a rotary device is arranged and includes a drive motor for actively rotating the second attachment section relative to the first attachment section, and
the inner Kelly bar is provided with a cable which is designed for conducting electricity and/or data.