Self-straightening tape measure of synthetic resin and a process

Details Self-straightening tape measure of synthetic resin and a process Self-straightening tape measure of synthetic resin and a process

1981-08-14

1984-07-17

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

G01B 310

Patent

active

044597533

ABSTRACT:
A self-straightening tape measure which is commonly called a convex rule, has hitherto been prepared exclusively of steel, however, the tape measure of steel is not only liable to be rusted but also is dangerous owing to good conductor of electricity when used in the vicinity of electric wires. In order to eliminate the above disadvantages, the present invention provides a self-straightening tape measure of resin, which is prepared by impregnating a tape material of crossing fibers with a large amount of thermosetting resin, bending the tape material in the width direction to form an arc in cross section, so that the arc may occupy from one-third to three-fourths of the whole circumference of the circle described by extending the arc, and heating the tape material to harden the resin and to have the said arcuate form.

REFERENCES:
patent: 2526945 (1950-10-01), Gray
patent: 3073544 (1963-01-01), Cirues et al.
patent: 3409988 (1968-11-01), Zelnick
Japanese Opened Utility Model Appln. under Laying-Open No. 48-10465, Published in 1973.
Japanese Opened Utility Model Appln. under Laying-Open No. 55-106804, Published Jul. 25, 1980.
Japanese Opened Utility Model Appln. under Laying-Open No. 55-106805, Published Jul. 25, 1980.
Japanese Opened Utility Model Appln. under Laying-Open No. 55-113230, Published Aug. 9, 1980.

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