| 摘要 |
<p>A collapsible frame is provided comprising at least two primary composite frames (10) of generally polygonal shape in the erected condition and each of which is composed of a plurality of crossed pairs of struts (12, 19) pivotally attached to each other by means of a median pivot (15, 20) in a central region of the length thereof with the ends of the struts being pivotally attached to a strut of a contiguous pair by means of inner and outer pivots (13, 14) to form a lazy tong construction. The median pivots connecting the struts of at least two adjacent pairs are inner median pivots (15) (as defined) such that the extended primary composite frame member adopts a polygonal shape in an erected terminal condition. The primary composite frames are connected by pivotally attached pairs of crossed connecting struts (11) extending in the longitudinal direction so as to extend and retract in lazy tong fashion in unison with the struts of the primary composite frame members but in a plane at generally right angles thereto. The entire assembly is configured, such that in an erected condition the struts of the comer defining struts that are connected by the inner pivot (13) extend at an angle to each other of at least 240 degrees with respect to an angle of from 5 to 15 degrees at which they extend to each other in the collapsed terminal condition of the collapsible frame.</p> |
