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US 9,938,769 B2Granted
Ram boring device
AssigneeTRACTO-TECHNIK GmbH & Co. KG
InventorFranz-Josef Püttmann
Life of this patent
Estimating the term…
Abstract
A ram boring device has a pressurized-fluid driven striking piston in a device housing and a rotating reversing device configured to urge the striking piston from a forward operation to a reverse operation, in order to create oblique or horizontal bores in the ground. A piston chamber of a rotary piston drive is connected to a control fluid line.
Claims9
A ram boring device, having:
- a pressurized-fluid driven striking piston in a device housing and in selective communication with a service fluid pressure and a reversing device of the striking piston for controlling the operation of the boring device between a forward operation to a reverse operation in order to create oblique or horizontal bores in the ground,
- wherein a piston chamber of a rotary piston drive is connected to a control fluid pressure via a control fluid line for selectively rotating the rotary piston drive and unlocking the reversing device via an autonomously and independently controlled application of the control fluid pressure to a rotary piston of the rotary piston drive.
Dependencies are inferred from the claim text.