| 摘要 |
A safety knife with basic features of a switchblade knife comprising a pair of side plates, a blade, an interplate and a pin, wherein the blade has a locking slot at a top and another locking slot at a bottom thereof, a rack insertion hole and an opening in which a shaft pin provided with gear is fixed, the rack insertion hole having such a size and being provided in such a portion of said blade that a rack can travel smoothly therethrough engaging with the gear provided around the shaft pin, and the interplate has a spring portion and a locking claw at the end of the spring portion, said locking claw being to interact with the locking slots.
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