Down reaming apparatus having hydraulically controlled stabilize

Details Down reaming apparatus having hydraulically controlled stabilize Down reaming apparatus having hydraulically controlled stabilize

1993-10-12

1995-07-04

Bagnell, David J.

Boring or penetrating the earth

With expansible bore wall anchor

1753253, E21C 900, E21B 1710

Patent

active

054291984

ABSTRACT:
A down reaming apparatus has an upper stabilizer which supports the down reaming apparatus in the bored hole. A plurality of shoe assemblies are radially attached to the hub of the upper stabilizer. The shoe assemblies are biased against a bored shaft wall by pressurized cylinders which allow limited return movement with resistance of the shoe assemblies. A weight assembly comprising a plurality of stacked plates is secured to the frame of the down reaming apparatus and has manways therethrough which allow passage of workers. A lower stabilizer provides additional support for the down reaming apparatus. The lower stabilizer also includes shoe assemblies that are biased against the bored shaft wall by a pressurized cylinder.

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patent: 5199515 (1993-04-01), Sinclair et al.

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