| 摘要 |
PURPOSE: Pin joint structure of a watch chain is provided to improve structure and functions of a watch, and to offer good wearability while producing a qualified watch in a short time with good efficiency. CONSTITUTION: Pin joint structure of a watch chain consists of two joint bolts and a spring. A small unit is installed at one side of the joint bolt. The other side of the joint bolt is formed to an inclined circular surface. The both ends of the spring are combined on the unit of the joint bolt. A middle part of the unit is inserted into each gap(100) corresponding to a location of an inner hole on a pin joint groove.
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