Importance

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Abstract

A fastening device includes a case unit and a spool. The case unit includes a wall forming a receiving space and including an inner protrusion, an upper opening communicated with the receiving space, a lower opening opposite to the upper opening and communicated with the receiving space, and a base detachably connected to the wall. The spool is within the receiving space and includes an upper ring portion and a lower ring portion. The inner protrusion is adjacent to the lower opening. As the spool is inserted upward into the receiving space, the upper ring portion is located above the inner protrusion, the lower ring portion is restricted by the inner protrusion, and the spool is prohibited from leaving from the upper opening.

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First Claim