Abstract: A shutter assembly for a bay window to close an opening by moving a shutter curtain upward from a containing space in the bottom of the bay window and to open it by way of a downward movement of the curtain under the influence of a coil spring. The basic driving system for the shutter is located either in the roof or in the lower containing space of the bay window. Various devices are disclosed including a seal for sealing the space between the leading member of the curtain and the roof of the bay window, a structure for installing the driving motor, a structure for detachable connection of the driving shaft, hainging members used to raise and lower the curtain, a structure for supporting the winding drum on the driving shaft, as well as features to allow maintenance of the shutter assembly.

Abstract: The hothouse for cultivation according to the present invention relates especially to a hothouse for cultivation enclosed with transparent members, wherein reflexion plates are provided on the northern side for reflecting the sunlight toward the soil surface inside the hothouse, and also to a hothouse enclosed with transparent members, wherein the hothouse comprises a shutter which can be opened and closed freely, and is switchable between two types of hothouses which are a hothouse composed only of the transparent members and a double hothouse comprising a heat insulation space between the shutter completely closed and the transparent members, so that the heat of the sunlight received by the hothouse for cultivation is most effectively used and kept in the hothouse.