| 摘要 |
PROBLEM TO BE SOLVED: To provide a blade having an angle measuring section, which solves the conventional problem, wherein respective protractor blade and angle-measuring blade relating to an angle measuring tool can not accommodate to changes in valley depth and ridge height of a V-shaped groove in its changing situation being produced by forming/grinding, machining and bending works because of their fixed sizes, in order to break down the fixed concept of angle measuring tool and realize a variable angle measurement. SOLUTION: A slide opening 7 is formed at the center section of the angle-measuring blade 6 which is made up of two parallel linear sides 8, so as to be along the straight sides 8, and a straight-measure scale 5 is disposed on one straight side 8, and the whole surface of the other straight side 8 is adopted as the angle-measuring section 4. Movement operations are carried out in the length range of the slide opening 7 of the blade 6, such that the intersecting point of the center section (a) of the protractor becomes the standard, thereby expanding the variable angle and the measurement width of straight measure. In addition, respective lengths of the angle-measuring section 4 and the slide opening 7 are made proportional according to the length of the angle-measuring blade 6. COPYRIGHT: (C)2006,JPO&NCIPI
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