Well bore caliper and centralizer apparatus having articulated l

Details Well bore caliper and centralizer apparatus having articulated l Well bore caliper and centralizer apparatus having articulated l

1975-10-28

1976-08-31

Leppink, James A.

Wells

Guide for device or conduit

On sucker or pump rod

33178F, 324 10, E21B 1710

Patent

active

039774686

ABSTRACT:
An earth borehole instrument has a plurality of wear link members adapted to engage the borehole walls which are pivotally attached through articulated mechanical arms both to a fixed collar and to a spring-loaded slidable collar on the instrument. The articulated arms for each wear link member consist of a pair of power arms which are each pivoted at a center point on the wear link adapted to engage the borehole wall and a pair of sensing arms which are pivotally connected, respectively, to the ends of the wear link. In an alternative embodiment, a bow spring is mounted on the underside of the power arms for maintaining the wear link flat against the borehole wall.

REFERENCES:
patent: 2899633 (1959-08-01), Smith et al.
patent: 3092182 (1963-06-01), Blagg
patent: 3423671 (1969-01-01), Vezin
patent: 3555689 (1971-01-01), Cubberly, Jr.
patent: 3915229 (1975-10-01), Nicolas

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