Hidden bow spring for calipers and centralizers

Details Hidden bow spring for calipers and centralizers Hidden bow spring for calipers and centralizers

1975-10-28

1976-09-07

Novosad, Stephen J.

Wells

Guide for device or conduit

On sucker or pump rod

33178F, E21B 1710, G01B 512

Patent

active

039789241

ABSTRACT:
An earth borehole instrument having a plurality of pad members adapted to engage the borehole walls are pivotally connected through mechanical arms to a spring-loaded slidable collar on the instrument. Each of the pad assemblies has a bow spring on its inner surface which is fixedly attached to one of the mechanical arms and slidably attached to another of the mechanical arms supporting the pad. The hidden bow spring maintains the pad, serving as a wear link, in flat contact with the borehole wall. In alternative embodiments, hidden bow springs maintain one or more borehole wall-engaging wheels against the borehole wall.

REFERENCES:
patent: 1898074 (1933-02-01), Bailey
patent: 2174085 (1939-09-01), Hartman
patent: 2656890 (1953-10-01), Brandon
patent: 2695820 (1954-11-01), Segesman
patent: 2899633 (1959-08-01), Smith et al.
patent: 3282349 (1966-11-01), Cobbs et al.
patent: 3685158 (1972-08-01), Planche

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