Automatic speed calculation for scratch machine

Details Automatic speed calculation for scratch machine Automatic speed calculation for scratch machine

2007-10-02

2007-10-02

Noland, Thomas P. (Department: 2856)

Measuring and testing

Hardness

C073S104000

Reexamination Certificate

active

11055274

ABSTRACT:
An improved surface testing apparatus, such as a scratch test apparatus, allows accurate determination of the test speed, for example using one or more magnetic sensors. An example scratch test apparatus comprises an arm assembly, and an attached blade moving over the surface during the scratch test. A pair of spaced apart reed switches are provided proximate to the arm assembly, the reed switches being successively actuated by a magnetic portion of the arm asssembly as it moves during the scratch test.

REFERENCES:
patent: 3676777 (1972-07-01), Charters
patent: 4791807 (1988-12-01), Oechsle
patent: 4843895 (1989-07-01), Harper et al.
patent: 5359879 (1994-11-01), Oliver et al.
patent: 6520004 (2003-02-01), Lin
patent: 6631647 (2003-10-01), Seale

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