| 摘要 |
A portable stage comprises a truck body with a fixed roof forming a main fixed panel (A) of a stage which is made by foldable side wall panels of the truck which can fold out into B, C and even D and E extensions for establishing a 30 or 40 foot or even greater width stage (using such foldable panel assemblies on either side of the truck) or fold down to an array which fits entirely within the cross section envelope or frame of the truck for over-the-road travel. The length of the stage is the length of the truck body. Practical 0 DEG -180 DEG movement between end to end arranged panels B and C (or between C and D or D and E) is made possible by a series of actuating assemblies running the length of the truck and each of which comprises plural linear actuating rams (hydraulically or pneumatically operated) wherein one such ram makes a forward stroke for driving a panel through an extreme acute angle range of movement (e.g., 0 DEG -60 DEG ) and an opposite stroke for driving the same panel through extreme obtuse angle movement (e.g., 120 DEG -180 DEG ) and the other ram makes a stroke driving the panel in between such angular rates of movement, the rams both being similarly mounted on a relatively fixed one of the two panels and attached to the relatively moveable one of two panels between which the rams operate at points offset from the panel plane on a lateral extension of the relatively moveable panel to pivot such panels about an axis located on a lateral extension of the relatively fixed panel of the pair.
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