Multiple caliper arms capable of independent movement

Details Multiple caliper arms capable of independent movement Multiple caliper arms capable of independent movement

1990-04-10

1992-02-11

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

73634, 738665, 417226, G01V 100

Patent

active

050866451

ABSTRACT:
A multiple arm caliper system for operation of a multiple arm caliper tool is set forth. It incorporates an elongate tool body having a motor means therein. The motor means operates a coupling rod connected to a resilient spring loading a piston within a cylinder. Within the cylinder, and extending through a transverse head defining the cylinder, individual push rods for each caliper arm extend. The push rods are forced from the chamber by fluid pressure within the chamber. Each push rod connects through suitable pivot points to an independent bell crank which is pivotally mounted to rotate each arm. Fluid pressure within the chamber is provided by the motor operating through a push rod which couples through a coil spring in the preferred embodiment to the chamber.

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patent: 4342225 (1982-08-01), Jandera et al.
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patent: 4711303 (1987-12-01), Koeling et al.
patent: 4790381 (1988-12-01), Armell
patent: 4843896 (1989-07-01), Napeloni et al.
patent: 4845982 (1989-07-01), Gilbert
patent: 4852069 (1989-07-01), Clerke et al.
patent: 4953412 (1990-09-01), Rosenberg et al.

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