To securely detect whether one and the other sliding screens are closed while guaranteeing a smooth rotary manipulation of a crescent lock member.
A position detecting means 21 of a crescent lock member which can be positioned at a waiting position P1 having no contact with the crescent lock member and a detectable position P2 detecting whether the crescent lock member is brought into contact with a knob 14 of the crescent lock member and positioned at a lockable position Pr2 to enable the position detecting means to output a detected signal, is provided in a meeting stile 2 of an inner sliding screen 1 so as to be transferable along the vertical axial line pasing the rotary center of the crescent lock member 12. Further, the device is provided with a means 31 allowing a transfer movement of the detecting means for a position of the crescent lock member to the detectable position P2 when the inner and outer sliding screens 1, 5 are in the closed position.
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YAMAKAWA KIYUUKOU
HAGIWARA TATSUO
SOU KK