Measuring instruments

Details Measuring instruments Measuring instruments

1994-09-16

1996-08-27

Cuchlinski, Jr., William A.

Geometrical instruments

Indicator of direction of force traversing natural media

Process

33544, G01B 512, E21B 4708

Patent

active

055489001

ABSTRACT:
In a downhole measuring caliper for oil well casings, comprising a circumferential array of radially extensible sensing fingers (30) between upper and lower sets of centralizing arms, the fingers are actuated through integral pre-stressed spring arms (34) engaged with an actuating member on the axis of the instrument; relative axial movement between the array of fingers and the actuating member causes the fingers to pivot into measuring contact with the tube wall. The number of sensing fingers is maximized and maintenance is simplified.

REFERENCES:
patent: 713784 (1902-11-01), Mellor
patent: 3685158 (1972-08-01), Planche
patent: 4235020 (1980-11-01), Davis et al.
patent: 4251921 (1981-02-01), Fink
patent: 4302881 (1981-12-01), Schwind et al.
patent: 4851733 (1989-07-01), Rothstein

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