| 摘要 |
This invention relates to a device for shooting bullets by pressure medium for use in a toy gun. This mechanism includes a piston member fitted into an outer tubular member and reciprocating in response to changes in the pressure medium, and wait hook arms are provided in the piston member. Further, an inner tubular body having a gas injection hole is fixedly provided within the outer tubular member, and a needle valve for opening and closing the injection hole is provided in association with the inner tubular body. This needle valve is provided with a weight biased by a spring member. The weight is disengaged from the wait hook arm by the advancing movement of the piston member and hits against the rear end portion of the needle valve. In addition, at the rear end portion of the needle valve, there is provided a seal valve for temporarily closing a gas introduction hole provided on the side of the rear end portion of the outer tubular member by hitting of the weight. When the piston member is returned to the initial position, this seal valve is opened as a result of the fact that a push rod provided at the piston member disengages a locking piece which is holding the needle valve.
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