| 摘要 |
PURPOSE:To eliminate an auxiliary catching device and to enable perfect closing of an intermediate case only through the elastic force of an L-spring part, by a method wherein the length of an arm of the L-spring part on the side where it engages with an intermediate case part is two times or more or 3 times or less as long as a distance between a first joint part and a second joint part. CONSTITUTION:The length L of the arm of an L-spring part 10c on the side where it is combined with an intermediate case part 10a is set to a value which is two times or more or 3 times or less as long as a distance (l) between a first joint part 10d and a second joint part 10e. In addition to the above constitution, the length of the arm of a L-spring part 10c on the side where it is combined with a storage body part 10b is set to about a value (L-l), the shape of the L- spring part 10c forms a well-balanced V-shape, and an angle D of the one arm to the other arm forms an acute angle. Even if opening and closing are repeated, an angle C, formed during opening, of the one arm to the other arm of the L- spring part 10c is within the range of an acute angle, and this enables production of torque which is necessary to and sufficient for complete closing. |
