| 摘要 |
A portable traffic signal has a base for mounting on the bed of a transporting vehicle, an articulated frame pivotally attached to the base and capable of extending and contracting and a traffic signal light supported by the frame such that when the frame is extended the signal light is elevated and horizontally displaced from the transporting vehicle. When the frame is fully contracted, the signal light and the frame are compactly fitted onto the base. The frame comprises structural members connected by hinge assemblies in the form of two adjacent parallelograms and two adjacent quadrangles, the quadrangles being other than parallelograms such that when the frame is fully contracted the structural members are in substantial horizontal alignment above the bed.
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