| 摘要 |
A perforator cover of a butane gas tank is provided to discharge residual gas, and to improve safety by forming a hole in a plastic circular plate and conversely shutting the perforator cover. A discharge pipe of a butane gas tank is pressed by a circular plate formed in the middle of a perforator cover in conversely shutting the perforator cover, and residual gas is discharged by fitting the discharge pipe of the butane gas tank to a hole of 3 mm formed in the middle of the circular plate after inserting the discharge pipe to a center of the circular plate at 5 mm. The hole of the circular plate is lifted up at a height of 4 mm, and formed of a circular column. The hole of 3 mm is formed in the center of the circular plate inside the perforator cover. Residual gas is discharged through the hole of the circular plate by conversely closing the perforator cover after using the butane gas tank.
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