| 摘要 |
Devices to allow entry into premises and prevent exit therefrom, or vice versa, or alternatively to allow free movement in both directions, as desired by the user. The invention consists of a revolving door 1 turning clockwise in which each panel 2, 3, 4, 5 is shaped or cut out in an identical way to allow the door to rotate when the first panel 6 is positioned at a to b. This panel 6 is cut out in the opposite way to the doors. A second panel 7 is, moreover, fixed at c.d. This panel 7 is the same height as the door and of a width matching the maximum space between two panels of the revolving door 1 and is shaped as a quarter circle. To reverse the direction of movement, the panel 6 is placed at e.f. and the second panel 7 at g.h. To allow movement in both directions, the panels 6 and 7 are removed or folded. <IMAGE>
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