Device for checking accuracy of a right angle

Details Device for checking accuracy of a right angle Device for checking accuracy of a right angle

2008-11-19

2010-06-08

Bennett, G. Bradley (Department: 2841)

Geometrical instruments

Distance measuring

By flexible tape

C033S679100

Reexamination Certificate

active

07730631

ABSTRACT:
A tape measure has a first scale on one edge of the blade and a second scale on the other edge blade where the second scale is marked in units of length which are equal to the units of the first scale multiplied by the square root of 2. A method to check a right angle measures from a corner to a distal end of a first line using the units of the first scale, measures along a second line an equal length in the first units from the corner and marking a point, by measuring from the distal end to the point using the second scale and by adjusting an angle between the first and second lines at the corner until the distance between the distal end and the point is equal to the length of the first line when measured on the second scale.

REFERENCES:
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patent: 5519943 (1996-05-01), Snyder
patent: 5875557 (1999-03-01), Ueki
patent: 6536124 (2003-03-01), Eskew et al.
patent: D540207 (2007-04-01), Ikeda
patent: 2003/0126752 (2003-07-01), Brandon et al.
patent: 2005/0072009 (2005-04-01), Doublet
patent: 2009/0307920 (2009-12-01), Schrage

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