| 摘要 |
PROBLEM TO BE SOLVED: To provide a desired length and obtain a strength which can be endured to the use as a spring by positioning a ring part whose center located on a basic line in its inside, providing first/second spiral parts arranged on both sides and molding the ring part and the first/second spiral parts integrally by a synthetic resin. SOLUTION: First/second spiral parts 4, 5 are provided by such state that respective center axiss are matched with a firs standard line L1 and the end of a ring part 3 side is connected to the ring part 3. On the end of an opposite side, ring shape seat windings 4a, 5a are formed by the same number of winding and the nearly same length. Each one winding unit of the spiral parts 4, 5 is separated and formed to a compression coil spring. A ring part 3 is provided between the first/second spiral parts 4, 5 and by providing a gate on this ring part 3, a resin made coil spring 1 provided with a strength as the spring can be produced. |
