| 摘要 |
PURPOSE:To provide a front chamber with a double shutter which is not a hindrance when it is not used. CONSTITUTION:An inner gate 12A is provided on an entrance 10A of a building 10 and a front chamber 12 with a double shutter is provided in such manner as to be connected to the entrance 10A of the building 10. An inner shutter 14 is provided on the inner gate 12A. An outer shutter 32 is provided on an outer gate 12B of the front chamber 12 with a double shutter, and the outer gate 12B can be moved in the direction of changing the relative distance from the inner gate 12A by a movable front chamber driving portion 20 provided in the lower portion. The space between the inner shutter 14 and the outer shutter 34 is taken as a front chamber main body 12C, and the skeleton of the front chamber main body 12C can be folded up by plural sheds 37, a pair of shed columns 38 for supporting the shed 37, and side reinforcements 40 for connecting the plural shed columns 38 to each other. The skeleton of the front chamber main body 12C is covered with a collapsible sheet material 42. |
