| 摘要 |
Pressure-type tongs using a locking unit of engagement structure are provided to secure airtightness in closing a vinyl packing container after opening, by keeping a locking state uniform. In pressure-type tongs using locking units(12,22) of engagement structure, two support bars(10,20) divided into upper and lower parts are connected by a hinge(H). A protruded side wall(11) with the length shorter than that of the support bar is formed in the center of the bottom of the upper support bar in a longitudinal direction. A hole(21) to which the side wall is fitted is formed at the lower upper support bar in a longitudinal direction corresponding to the side wall formed at the bottom of the upper support bar. The locking unit is installed at the end of the support bar to hold the fitting state of the side wall in the hole.
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