Larry F Rowe

US Patent:

53259327, Jul 5, 1994

Filed:

Mar 27, 1992

Appl. No.:

7/859321

Inventors:

Llewellan Anderson - Renton WA
Brian W. Kelley - Kent WA
Larry F. Rowe - Federal Way WA
Thomas C. Whitehouse - Puyallup WA

Assignee:

The Robbins Company - Redmond WA

International Classification:

E21B 728
E21B 1710
B60C 1704

US Classification:

1753253

Abstract:

A down remaining apparatus has an upper stabilizer which supports the down reaming apparatus in the bored hole. A plurality of wheel assemblies are radially attached to the hub of the upper stabilizer. Each of the wheel assemblies has rotatable tires oriented against the bored hole wall, and a rotatable overload wheel which contacts the tunnel wall upon compression of the tires. 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. A plurality of wheel assemblies are radially attached to the hub of the lower stabilizer. Each of the wheel assemblies has a rotatable wheel pivotally attached to the lower stabilizer hub and spaced therefrom by a compressible bumper which reacts against the bored hole wall to stabilize the down reaming apparatus.