| 摘要 |
Two adjacent horizontal first (1) and second (2) frame parts are joined to each other by two vertical third (3) and fourth (4) frame parts. All four parts are rotatably joined to each other in order to form an assemblable and collapsible sign board system. The distance between two rotary axes (20,21) for the first (1) frame part is the same as that between two such axes (22,23) for the second (2) part. - The distance between the rotary axes (21,23) for the third part (3) is equal to that between similar axes (20,22) for the fourth (4) part. When the sign board system is collapsed, the first and second frame parts assume a parallel position next to one another. |
