Restriction mechanism for manual shutter device

An opening/closing direction restriction mechanism for a manual shutter device comprising:

• a fixed shaft substantially horizontally extended,
• a winding member rotatably disposed on the fixed shaft to wind a slat,
• a torsion spring disposed inside the winding member to bias the winding member in a winding direction which winds the slat,
• a bracket attached to one of the winding member and the fixed shaft;
• a flange disposed adjacent to the bracket and attached to the other of the winding member and the fixed shaft;
• a two-way clutch disposed on a side surface of the bracket facing the flange,
• a gear formed on the flange;
• an external gear for the two-way clutch disposed on an input shaft of the two-way clutch and engaged with the gear,
• wherein the two-way clutch is disposed such that the two way clutch is configured to be switched between a reverse rotation inhibited state in which the external gear for the two-way clutch is allowed to be rotated along the winding direction of the winding member and the external gear for the two-way clutch is inhibited from being rotated along an unwinding direction and a forward rotation inhibited state in which the external gear for the two-way clutch is inhibited from being rotated in the winding direction of the winding member and the external gear for the two-way clutch is allowed to be rotated along the unwinding direction;
• and
• wherein the bracket is formed in a cylindrical shape, externally fitted on the fixed shaft, and rotatably disposed integrally with the winding member, and the flange is fixed to the fixed shaft.