Downhole weight control device for impact rock drilling tool

Details Downhole weight control device for impact rock drilling tool Downhole weight control device for impact rock drilling tool

1977-12-27

1980-07-15

Pate, III, William F.

Boring or penetrating the earth

Automatic control

Of boring means including a below-ground drive prime mover

175 94, 175321, E21B 1704

Patent

active

042123593

ABSTRACT:
A downhole weight control device is described for connecting to the upper end of a downhole, pneumatically-operated, impact rock drilling tool for applying a downward force on the tool sufficient to maintain the drill bit in the closed working position. The weight control device has a piston member that has an effective area related to the surface area of the hammer piston in the drilling tool to effectively counterbalance an upward force of the tool tending to lift the tool. The control device also prevents exerting excessive weight on the drill bit. The control device has means for automatically decreasing the working pressure should the drill string be fed for a period of time at a rate greater than the penetration rate of the tool.

REFERENCES:
patent: 2684835 (1954-07-01), Moore
patent: 3198264 (1965-08-01), Oelke et al.
patent: 3463252 (1969-08-01), Miller et al.
patent: 3815692 (1974-06-01), Varley
patent: 3858188 (1974-12-01), Vasiliev et al.

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