Method of controlling the reversing of a device for driving hole

Details Method of controlling the reversing of a device for driving hole Method of controlling the reversing of a device for driving hole

1978-02-16

1980-07-29

Staab, Lawrence J.

Tool driving or impacting

Processes

173 91, B25D 900

Patent

active

042146380

ABSTRACT:
A percussive device operable in a forward mode for making a hole in soil and operable in a reverse mode to retract the device from the hole. The device is provided with control means that change the mode of operation alternatively under control of a valve that turns air pressure on and off in a supply or feed line to the device. When the air is turned off from the device the valve establishes connection to an aspirator for establishing a suction condition to the device that will reverse the mode so that upon turning on of air back to the device will make it operate in the changed-over mode.

REFERENCES:
patent: 3705633 (1972-12-01), Sudnishnikov et al.
patent: 3727701 (1973-04-01), Sudnishnikov et al.
patent: 3744576 (1973-07-01), Sudnishnikov et al.
patent: 3756328 (1973-09-01), Sudnishnikov et al.
patent: 4078619 (1978-03-01), Sudnishnikov et al.

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