| 摘要 |
A flexible fastening device in one embodiment includes a male fastening unit including a hook member securely looped around a mask strap, and a slotted stud having two side trigger members; and a female fastening unit including a clip put on a breathing tube of snorkel, and a hollow clasp projected from the clip and including an internal space and an opening in communication with the external and the space. Pressing the trigger members will decrease the size of the stud, inserting the stud into the space by passing the opening, and stopping the pressing will expand the stud to lock the stud in the space. Pressing the trigger members again will decrease the size of the stud, and pulling the stud will remove same out of the space by passing the opening.
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