| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of parts and make it easy to assemble a stamp board and thereby save its manufacturing cost by providing a torsional coil spring for automatically opening a lid for the ink pad in such a manner that it can be mounted without the use of a stem. SOLUTION: The main body 1 of a case for storing an ink pad 8 is formed of an upper frame 7 and a bottom plate assembled together, and also hinge bearing parts 3, 4, each of which is arranged on both right/left sides, on the rear face, of the main body 1 of the case. In addition, a hind bearing part 5 with both ends which can be engaged with the hinge bearing parts 3, 4 in freely rotatable manner, is provided on the rear lateral face of a lid 2. Further, a groove part 15 is provided on the hinge bearing part 5 of the lid 2, then the coil part 16 of a torsional coil spring 14 is stored in the groove part 15, and an arm part 17 on one of the ends of the torsional coil spring 14 is held and fixed between the bottom plate and the upper frame 7, both of which form the main body 1 of the case. |
