METHOD FOR MANUFACTURING STOP COCK

• Main Authors: IMURA HAJIME, MORIBE HIROSHIGE
• Format: Patent
• Language: English; Japanese
• Published: 08.08.2016
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

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 【課題】生産性の低下を招くことなく、アンダーカット部を有する止水栓を円滑に製造することができる止水栓の製造方法を提供する。【解決手段】止水栓１０は、アンダーカット部１２を有する第１の接続部１３と、外ねじ部１４を有する第２の接続部１５と、内ねじ部１６を有し、第１の接続部１３及び第２の接続部１５との間の水の流れを遮断する止水部１７とを備えている。止水栓本体１１はゴム状弾性体入りの樹脂で形成され、ねじ部１４、１６はインサート部材２８、３５で形成される。止水栓１０の成形時には、金型内にインサート部材２８、３５を配置し、ゲートからキャビティにゴム状弾性体入りの溶融樹脂を射出して止水栓本体１１を成形した後、固定型を型開きし、第１の接続部１３では可動型を無理抜きし、第２の接続部１５及び止水部１７においては可動型を抜き出して止水栓１０を製造する。【選択図】図１