Patent ID: 7540391

Claim:
A door shutter comprising: a device including an opening, and side portions for defining the opening having one side and the other side extending higher than the one side, guide grooves formed along the side portions extending substantially parallel to each other without substantial height difference between the two sides, and having curved portions, and a shutter including main bodies bendable in a sliding direction for opening and closing the opening on the device, and projecting portions projecting from lateral sides of the main bodies in a width direction thereof and slidably engaging the guide grooves, said main body having a cover member disposed between the guide grooves substantially parallel thereto, a wall thickness in the width direction, and first and second sides corresponding to the one and the other sides of the device, the wall thickness at the second side being thicker than that at the first side corresponding to the other side to form a substantially uniform surface from the one to the other sides through the main bodies inclined relative to the cover member, wherein said main bodies include elongated rigid pieces arranged along the sliding direction of the shutter with a predetermined space between two rigid pieces and having connecting projections at lateral sides thereof, said rigid pieces being inclined relative to the cover member.