US 5,092,056 AGranted

Reversed leaf spring energizing system for wellbore caliper arms

AssigneeHalliburton Logging Services, Inc.

InventorJohn G. Deaton

Life of this patent

Estimating the term…

Abstract

A caliper tool mechanism is set forth. In the preferred and illustrated embodiment, a pair of opposing caliper arms are pivotally mounted on a elongate body and are recessed in elongate slots in said body. The caliper arms are retracted to a parallel position. The arms extend parallel to the elongate body and cover an elongate leaf spring. The spring has a fastened lower end affixed to the lower end of the body, and upper ends joined through moveable lengths to said caliper arms.

Claims4

Dependent claims

A borehole tool for downhole measurement of borehole diameter comprising:

(a) an elongate body member having four lengthwise slots forming four arm receiving recesses arranged at 90.degree. intervals therearound, and comprising two separate arm receiving recess pairs, said pairs having longitudinally offset locations along said body member, wherein said body is adapted to be raised in a borehole to make measurements in the borehole wherein said body member has upper and lower ends;
(b) a caliper arm in each of said recesses and having two ends, one end being an upper end joined by a pivot means to said body member, and having a pivotally deflected lower end moveably extending outwardly from said recess to contact the surrounding borehole in making a caliper measurement;
(c) elongate leaf spring means in each of said recesses and comprising at least one full length leaf spring element and at least two shorter leaf spring elements having aligned lower ends thereof, the upper ends of said leaf springs varying in length, and springs elements being joined collectively at said aligned lower ends by bolt means extending through said aligned lower ends thereof to form said elongate leaf spring means and wherein each of recesses comprises a lengthwise slot longer than said arm and said spring means to enable said arm to fully retract;
(d) fastening means, comprising bolt means extending through said leaf spring means and said elongate body member, for positioning said springs means parallel to said body member in an energized state wherein said spring means is positioned parallel to and beneath said caliper arm in each of said recesses in the retracted state thereof;
and
(e) connective like means connected between said caliper arm and said spring means at the upper end thereof and remote from said fastening means, said link means deflecting said caliper arm to the opened state wherein said connective link means imparts an opening force to extend the lower end of said arm outwardly from each of said recesses.

3 more elements

Dependencies are inferred from the claim text.

patentgrep

Loading patent…

Abstract

A borehole tool for downhole measurement of borehole diameter comprising:

(a) an elongate body member having four lengthwise slots forming four arm receiving recesses arranged at 90.degree. intervals therearound, and comprising two separate arm receiving recess pairs, said pairs having longitudinally offset locations along said body member, wherein said body is adapted to be raised in a borehole to make measurements in the borehole wherein said body member has upper and lower ends;
(b) a caliper arm in each of said recesses and having two ends, one end being an upper end joined by a pivot means to said body member, and having a pivotally deflected lower end moveably extending outwardly from said recess to contact the surrounding borehole in making a caliper measurement;
(c) elongate leaf spring means in each of said recesses and comprising at least one full length leaf spring element and at least two shorter leaf spring elements having aligned lower ends thereof, the upper ends of said leaf springs varying in length, and springs elements being joined collectively at said aligned lower ends by bolt means extending through said aligned lower ends thereof to form said elongate leaf spring means and wherein each of recesses comprises a lengthwise slot longer than said arm and said spring means to enable said arm to fully retract;
(d) fastening means, comprising bolt means extending through said leaf spring means and said elongate body member, for positioning said springs means parallel to said body member in an energized state wherein said spring means is positioned parallel to and beneath said caliper arm in each of said recesses in the retracted state thereof;
and
(e) connective like means connected between said caliper arm and said spring means at the upper end thereof and remote from said fastening means, said link means deflecting said caliper arm to the opened state wherein said connective link means imparts an opening force to extend the lower end of said arm outwardly from each of said recesses.

3 more elements