| 摘要 |
PROBLEM TO BE SOLVED: To provide a pair of double-levered scissors capable of giving effective cutting power, without having such large opening/closing strokes in cutting. SOLUTION: This pair of double-levered scissors consists of a first lever pair 3 which rotate about commonly-used first fulcrums 1a and 1b to expand the gap between the nose parts on the short arm side by narrowing the gap between the handles on the long arm side; and a second lever pair 6, their long arms being pivoted about respective pins on the short arm side 7 of the first lever pair, which rotate about two separate second fulcrums 4 respectively to close the blades on the short arm side, following the expansion of the short arm side. This pair of double-levered scissors is provided with the two separate first fulcrums, and each short arm of the first levers is respectively connected with each long arm 8 of the second levers. Each of the supposed action lines joining each of these points, regarded as working points, with each of the second fulcrums, and each of the supposed progressive lines made as each of these working points are moved, form a supposed working angle where they cross. The working angle is increased as the cutting movement proceeds, and the angle is set about 90 degrees at the end. COPYRIGHT: (C)2004,JPO
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