Geometrical instruments – Gauge – Comparator
Reexamination Certificate
1999-07-06
2001-08-28
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Gauge
Comparator
C033S19900R, C033S509000
Reexamination Certificate
active
06279241
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a thickness gauge and, more specifically, relates to an improvement on the standard metallic sheet of a thickness gauge, which improves the conventional thickness gauge and avoids measurement errors resulted from overlaying the metallic sheets of a thickness gauge.
2. Description of the Related Art
Thickness gauges have been widely utilized in the mechanical industry and are mainly utilized to check the gap between mechanical parts, for example, the gap between electrodes of a common engine spark plug and gap between rotor and stator of an electric motor. The thickness gauge is a necessary measurement tool in a mechanical factory. The measurement results are adopted to adjust various components and always influence the operation of the whole machinery. The measurement accuracy for a thickness gauge plays an important role in the industry.
There is a common experience for those who have ever used a thickness gauge. That is, two or three pieces of metallic sheet would overlap when using the thickness gauge, especially for those made to have thickness under 0.1 mm. This is because human eyes hardly distinguish such thin and soft standard metallic sheets for one, two or three sheets. For example, human can not tell 0.03 mm from 0.07 mm. Thus, a metallic sheet of 0.03 mm overlaying a metallic sheet of 0.04 mm is usually regarded as a metallic sheet of 0.03 mm. Since two overlapping metallic sheets are often mistaken as one, the measurement results are obviously wrong.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a novel and practical thickness gauge which could effectively help users to identify clearly and conveniently the gap between metallic sheets and avoid the use of overlapping standard metallic sheets.
Another object of the present invention is to provide a novel and practical thickness gauge which ensures the accuracy of measurement results without misuse.
To avoid the above disadvantages and achieve the objects mentioned above, the present invention discloses a novel thickness gauge which comprises a hole at each metallic sheet made to have standard thickness. The hole positions of neighboring metallic sheets are different and not overlaying, whereby the metallic sheet of the thickness gauge should be expanded to single one when using any metallic sheets made to have standard thickness. The hole on a metallic sheet could be seen through when only the metallic sheet is expanded. When two or more pieces of metallic sheets overlap, the hole on any sheet will be covered by neighboring metallic sheet and can not be seen through. This avoids such mistakes that two or more metallic sheets are mistaken as one.
In the following the present invention will be elucidated with reference to the accompanying Drawings which, however, are being presented for illustrative purpose.
REFERENCES:
patent: 318051 (1885-01-01), Starrett
patent: 552238 (1895-12-01), Darling
patent: 590486 (1897-08-01), Sawyer
patent: 867011 (1907-09-01), Bromley
patent: 987703 (1911-03-01), Curtin
patent: 4517747 (1985-05-01), Morin
patent: 5471757 (1995-12-01), McDonald
patent: 5665973 (1997-09-01), Christenson
patent: 5875558 (1999-03-01), Bakke et al.
Gutierrez Diego
Industrial Technology Research Institute
Kenyon & Kenyon
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