Downcrowding device for earth boring machines

Details Downcrowding device for earth boring machines Downcrowding device for earth boring machines

1978-01-11

1979-04-24

Hafer, Robert A.

Tool driving or impacting

Advance causing or controlling means

Driven flexible member causes advance

173 81, B23Q 500

Patent

active

041507274

ABSTRACT:
A device for applying an additional downward force to the rotating cutting tool of an earth boring machine. The machine has a mast and a rotating drive member suspended by the mast for vertical movement and for rotating the cutting tool. A rotatable drum is carried by hydraulic cylinders adjacent and below the top of the drive member. The drum has a brake and is connected by a downcrowding cable to the top of the drive member. Downward movement of the hydraulic cylinders while the drum brake is locked creates tension in the cable, applying downward force to the drive member. A take-up cable is wrapped around the drum in the opposite direction. It is reeved over the mast and connected to the top of the drive member by a spring. The spring takes up slack in the cable when the hydraulic cylinder returns for a new stroke and allows the kelly to move downward as the drum is pulled down by the cylinder.

REFERENCES:
patent: 3717205 (1973-02-01), Wilderman
patent: 3719238 (1973-03-01), Campbell et al.
patent: 3721305 (1973-03-01), Mayer et al.
patent: 3987856 (1976-10-01), Carl et al.
patent: 3994350 (1976-11-01), Smith et al.

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