Heat insulating shutter device

A structure comprising, in combination:

• (1) a building having an interior and an exterior defined at least in part by a vertical external wall, said vertical external wall having an opening therein extending from an outside surface of said vertical external wall to an inside surface thereof;
• and
• (2) a heat insulating shutter device having:
• a coiled shutter housing constructed to be provided on an upper edge portion of the outside surface of said vertical external wall adjacent said opening, the housing having a lower end formed with a shutter outlet, a shutter winding-unwinding horizontal drive roller disposed within the housing, and a shutter attached to the drive roller;
• said shutter including a multiplicity of slats connected to one another so as to be wound up to a coiled form;
• a hollow side frame provided on each of opposite side edge portions of the wall defining the opening;
• grooved shutter guides opposed to each other and each provided on inner walls of the side frames;
• the shutter guides having movably fitted therein respective opposite side edge portions of the shutter;
• the slats of the shutter and the side frames each having a hollow portion filled with a heat insulating material;
• and wherein the shutter housing includes
• (a) a cover having an upper sidewall portion, a front sidewall portion and a lower sidewall portion,
• (b) said shutter outlet being in said lower sidewall portion,
• (c) the upper sidewall portion being forwardly downwardly inclined over a substantial portion thereof and being fixed at its upper edge to said outside surface of said external vertical wall of the building, and
• (d) the lower sidewall portion providing a concave surface, therefore being rearwardly inclined downward over a substantial portion thereof in front of the shutter outlet.