Drill collar position verifier

Details Drill collar position verifier Drill collar position verifier

1990-08-23

1991-08-20

Myracle, Jerry W.

Geometrical instruments

Distance measuring

Single contact with a work engaging support

340686, G01B 322

Patent

active

050403095

ABSTRACT:
A drill collar position verifier is disclosed for use with a drill bit having a drilling depth control collar positioned coaxially thereon. The drill bit is inserted in a cylindrical opening in a plastic block to a depth determined by the position of the collar. A metallic foil and membrane switch are positioned below the plastic block of predetermined depth and are connected to logic circuitry which is further connected to LED indicators. If the drill bit does not protrude through the plastic block, an LED is lit to indicate that the collar is positioned too close to the tip of the drill bit. If the drill bit protrudes through the fixture and contacts the foil only, an LED is lit to indicate that the collar is positioned within tolerances. And, if the drill bit protrudes through the fixture and contacts both the foil and the membrane switch, an LED is lit to indicate that the collar is positioned too far away from the tip of the drill bit.

REFERENCES:
patent: 2508051 (1950-05-01), Warren et al.
patent: 4749858 (1988-06-01), Young

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