| 摘要 |
A device in which a substantially flat object, for example an advertising board, may be placed, said device comprising fastening means for securing an object at its upper side and being provided with a convex surface at its bottom side, such that in a position of rest the device keeps the object in a substantially vertical position, and that in another position the centre of gravity of the device with the object is located such that the device will move towards said position of rest under the influence of gravity. Part of the bottom side of the device may substantially be in the shape of a part of a cylindrical surface. |
