Baker International Inc.

Thomas E Bagley

Rudy B Callihan

Alvin K Warzecha

David J Vlasek

A centering device is provided which is adapted to be mounted on a running-in string for subsequent disposal in a well bore. Upper and lower companion supporting members having a plurality of circumferentially spaced openings therein and shoulders circumferentially extending around the uppermost interior of each of the supporting members are provided for receipt of circumferentially spaced and outwardly bowed springs having upper and lower ends overlying the lower portion of the exterior of the supporting members and extending inwardly through the openings. The springs have portions disposed in the openings with the upper and lower ends of the springs respectively engaging the upper and lower shoulder of the support members. The spring portions include extensions received in the openings whereby each of the spring extensions longitudinally overlaps that portion of the supporting member defining the opening to interlock the spring extension with the portion of the supporting member to prevent removal of the spring from the support upon permanent securement of the spring to the supporting member. The opening receives the spring without permitting lateral shifting of the spring within the supporting member.

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San Antonio, TX, United States of America

Thomas E Bagley