Pneumatic ram boring device

Details Pneumatic ram boring device Pneumatic ram boring device

1979-03-30

1981-02-17

Leppink, James A.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

175 19, E21B 726

Patent

active

042509726

ABSTRACT:
A self-propelled pneumatic ram boring device for boring holes in the ground comprises a percussion piston which is reciprocable in a housing, and a control sleeve which controls the forward and rearward movement of the piston by passing over radial control ports in the piston. In order to control the device to move either forwards or rearwards, without having to twist a hose which supplies air to the device as is usual, the control sleeve is rigidly fixed in position in the housing and has control ports to which air is supplied or not under the control of valve members and which are themselves remotely controlled by a second compressed air supply to the device, or electrically.

REFERENCES:
patent: 3407884 (1968-10-01), Zygmunt et al.
patent: 3727701 (1973-04-01), Sudnishnikov et al.
patent: 3744576 (1973-07-01), Sudnishnikov et al.
patent: 3865200 (1975-02-01), Schmidt

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