Sheet opening/closing and spreading apparatus

A sheet opening/closing and spreading apparatus comprising a pair of support rods opposed to each other, a track having opposite ends fixed to, and laid between, said paired support rods, a movable member attached along, and movably to, said track;

• a sheet fixing frame attached to said movable member and extending in a direction traversing the movable member, and a sheet fixed at one end thereof to one of said support rods, the opposite end of said sheet being fixed to said sheet fixing frame, and said sheet being spread or opened between said paired support rods by moving said movable member along said track.

A sheet opening/closing and spreading apparatus used in a greenhouse wherein a framework is constituted by both vertical and horizontal support rods and a sheet is spread over said framework, said sheet opening/closing and spreading apparatus comprising one or plural tracks having opposite ends fixed to, and laid between, two of said horizontal support rods, a movable member or members attached along, and movably to, said track or tracks;

• a sheet fixing frame extending horizontally and attached to said movable member or members, one end of the sheet being fixed to a horizontal support rod and the opposite end thereof fixed to said sheet fixing frame, the sheet being spread over said framework by moving said movable member or members along said track or tracks.

A sheet opening/closing and spreading apparatus used in a greenhouse wherein a framework is constituted by both vertical and horizontal support rods, a sheet is spread over said framework and ventilation is performed by opening and closing a portion of the sheet, said sheet opening/closing and spreading apparatus comprising one or plural tracks having opposite ends fixed to, and disposed between, an upper horizontal support rod and a lower horizontal support rod, a movable member or members attached along, and movably to, said track or tracks;

• a sheet fixing frame extending horizontally and attached to said movable member or members, the lower end of the sheet being fixed a lower horizontal support rod and the upper end thereof fixed to said sheet fixing frame, and wherein ventilation is performed by spreading or opening the sheet between the upper and lower horizontal support rods which spreading or opening motion of the sheet is effected by moving said movable member or members along said track or tracks.

A sheet opening/closing and spreading apparatus used in a greenhouse wherein a framework is constituted by both vertical and horizontal support rods, a sheet is spread over said framework, and a heat retaining or light shielding sheet is disposed below said spread sheet so as to be capable of being opened and closed, said sheet opening/closing and spreading apparatus comprising two support rods disposed at upper positions within said framework in an opposed relation to each other, one or plural tracks having opposite ends fixed to, and laid between said two support rods, a movable member or members attached along, and movably to, said track or tracks;

• a sheet fixing frame fixed to said movable member or members and extending horizontally, one end of said heat retaining or light shielding sheet being fixed to one of said two support rods and the opposite end thereof fixed to said sheet fixing frame, and said heat retaining or light shielding sheet being spread or opened between said two support rods by moving said movable member or members along said track or tracks.

A sheet opening/closing and spreading apparatus comprising a pair of support rods opposed to each other, a track laid between said paired support rods, and a movable member attached to said track movably, and wherein a sheet is spread and opened between said paired support rods with movement of said movable member along the said track;

• said movable member comprising a housing, a gear or sprocket disposed rotatably within said housing, and a drive shaft extending through said housing transversely of the housing and connected to said gear or sprocket, and said track is constituted by a chain belt, said chain belt extending through said housing longitudinally of the housing and being in mesh with said gear or sprocket.

A sheet opening/closing and spreading apparatus comprising a pair of support rods opposed to each other, a track laid between said paired support rods, a movable member attached to said track movably, a sheet fixing frame attached to said movable member and extending in a direction traversing the movable member, and a sheet fixed at one end thereof to one of said support rods, the opposite end of said sheet being fixed to said sheet fixing frame, and said sheet being spread or opened between said paired support rods by moving said movable member along said track;

• said track or tracks are each constituted by a chain belt, and said movable member or members each comprise a housing, a sprocket disposed rotatably within said housing and engaged with said chain belt, and a rotatable drive shaft for rotating said sprocket.