Patent ID: 11881653
Assignee: CATERPILLAR INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 17:
18. The method of claim 16, further comprising:
causing the conductive rod to change in length in a closed-loop mode, comprising:
feeding the pressurized air into the central passageway within the pneumatic cylinder;
extracting the pressurized air from the central passageway within the piston;
receiving an indication from a sensor of a change in position of a reference point relative to a tip of the conductor rod; and
in response to the indication, selectively coupling an annular piston cavity to the pressurized air extracted from the central passageway or to the atmosphere, the annular piston cavity being positioned distal to the work machine and being bounded in the piston by successive piston tubes and a cylinder tube slidably mated between the successive piston tubes.