Ram boring machine having a pull-and-turn reversing gear

Details Ram boring machine having a pull-and-turn reversing gear Ram boring machine having a pull-and-turn reversing gear

1989-02-02

1990-09-04

Yost, Frank T.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

173 90, 173134, 175 19, B25D 900

Patent

active

049536265

ABSTRACT:
A ram boring machine having a pull-and-turn reversing gear which comprises a striking piston axially displaceable in a tubular housing and a rotatably mounted control pipe with control openings such that forward and backward movement of the machine is controlled by moving the control openings over corresponding radial control openings in the striking piston, the control pipe having at least two parts with the rear part (viewed in the ramming direction) being connected to a supply hose, being relieved of the working pressure, and being connected to the bearing pipe by way of a force-loaded locking device which can be unlocked axially by traction on the supply hose against the loading force. This arrangement on the one hand prevents undesired reversal and on the other hand enables reversal to be effected under pressure.

REFERENCES:
patent: 4629008 (1986-12-01), Kostyler et al.
patent: 4662457 (1987-05-01), Bouplon

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