Device and method for planeness testing

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor

Reexamination Certificate

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Details

C324S758010, C033S286000, C033S533000

Reexamination Certificate

active

07443157

ABSTRACT:
A device for testing planeness of an electrically conductive workpiece includes a platform for supporting the workpiece, a testing box movably fixed above the platform, an indicator, and a power supply. The testing box has a contact pin fixed on a bottom surface of the testing box. The contact pin is electrically wired in series with one electrode of the power supply. The platform is electrically wired in series with the other electrode of the power supply. The indicator is electrically wired in series with a testing circuit, which is made up of the power supply, the platform, and the contact pin. The contact pin is capable of movement above the platform at a distance which is equal to the sum of a thickness of the workpiece and a desired tolerance of the planeness, wherein if the planeness of the workpiece between the contact pin and the platform is out of tolerance, the testing circuit is closed, conducting power to the indicator, which will then indicate that the workpiece is ineligible.

REFERENCES:
patent: 5687487 (1997-11-01), Johnson
patent: 6043668 (2000-03-01), Carney
patent: 6354013 (2002-03-01), Mucke et al.
patent: 2004/0113640 (2004-06-01), Cooper et al.
patent: 2005/0024040 (2005-02-01), Martin et al.

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