The main attention when designing:
? 1) The withdrawal of the core inner, upper surface of the lower latch should skewers ÷ 0.1 mm surface hon0.05 core plate
2) of the closing angle β should take about 5 ÷ 25 °
3) structure with recovery function?
4) When sliding friction occurs between the latch plate skewers and keep pushing plate, the surface should be hardened to improve abrasion resistance.
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