| 摘要 |
PROBLEM TO BE SOLVED: To provide a stop cock manufacturing method capable of smoothly manufacturing a stop cock having an undercut part without deteriorating productivity.SOLUTION: A stop cock 10 comprises a first connection part 13 having an undercut part 12, a second connection part 15 having an outer screw part 14, and a water stop part 17 having an inner screw part 16 and blocking the flow of water between the first connection part 13 and the second connection part 15. A stop cock body 11 is formed of a resin containing a rubber-like elastic body, and the screw parts 14, 16 are formed of insert members 28, 35. When the stop cock 10 is molded, the insert members 28, 35 are arranged in a mold. After a molten resin containing the rubber-like elastic body is injected from a gate into a cavity to form the stop cock body 11, a stationary mold is opened, a movable mold is forcibly pulled out from the first connection part 13, and movable molds are pulled out from the second connection part 15 and the water stop part 17 to produce the stop cock 10.SELECTED DRAWING: Figure 1 |
