| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid injection gun wherein air pressure to be supplied into a cylinder for making a nozzle protrude can be reduced, so that a small and inexpensive air pump can be used. SOLUTION: The liquid injection gun comprises an insertion hole 12 wherein a nozzle 2A is vertically slidably passed through a base 1A and a cylinder chamber 13 is formed on an upper end, a first air passage 16 with an end connected to a first air duct AL1 and the other end communicating with an end of the cylinder chamber 13, and a second air passage 17 with an end connected to a second air duct AL2 and the other end communicating with the other end of the cylinder chamber 13. A piston 22 slidably placed inside the cylinder chamber 13 is provided at an upper end of the nozzle 2A. The piston 22 is slid by switching over air supply to the first air passage 16 and to the second air passage 17, thereby varying an amount of protrusion of the nozzle.
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