| 摘要 |
PURPOSE: A screw fastening safety lock is provided to improve the durability regardless of external environments by hiding a connection part of a safety lock hook and a safety lock hole. CONSTITUTION: A safety lock hook(18) is composed of a spring slide latch(11) and a latch hook(11-A). When the safety lock hook is inserted into a safety lock hole, the spring slide latch engages the latch hook and the safety lock hook. The screw thread of a lower protective cover is engaged with the screw recess of an upper protective cover(15) by screw fastening.
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