Other

Shiro Tsuji

Masatoshi Watanabe

Shinichi Hayakawa

Genko Kitamura

Yasuyuki Sumigama

Naotake Okada

This invention relates to a screw stopper including an anti-freeze device used for water pipe valve and fitted to the lower end portion of an open/close movable valve of said water pipe valve comprises: a small perforation penetrated centrally on the lower portion of the said screw stopper; a water-through recess formed on a countersink portion of the said screw stopper; a small movable member including a small valve for opening and closing an aperture of the said small perforation, and said small movable member partially defining an water-through passage; a pair of springs for holding said small movable member, at least of which is made of shape-memory alloy; an outer cylinder for holding said pair of springs screwed and fitted to the said screw stopper; and a packing for sealing up water by a valve seat.

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Mino-City, Gifu-Pref., 501-37, Japan

Shiro Tsuji