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US 4,279,105 AGranted
Ground-based portable and collapsible structures
OwnerJohn S. Cameroninventor
Life of this patent
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OwnerJohn S. Cameroninventor
Estimating the term…
A ground-based portable and collapsible structure comprises two similar rectangular plates hinged together and disposed in downwardly-diverging relationship with their hinge-remote edges engaging the bottoms of re-entrant slots opening from the upper edges of spaced and parallel bar means of inverted T-section disposed on the ground transverse to said plate edges. Each bar means may be an inverted T-section bar or two L-section bars secured to one another with their vertical webs mutually opposite and spaced, preferably by spindles on which spiked metal strips are mounted for pivotal movement between a first position wherein it is accommodated in said gap and a second position wherein it projects downwardly from the L-section bars, the two strips being offset one to each side of the median plane bisecting said gap and being maintained in such dispositions by spacers mounted on the spindles alongside the strips.
A ground-based portable and collapsible structure, e.g. a road sign, comprising two similar substantially rectangular plates hinged together and to be disposed in use in downwardly-diverging relationship with restricting means joining the two plates remote from the hinge axis to limit the angle to which the plates can open from one another, characterised in that the restricting means comprises a pair of bar means to be disposed in use on the ground in spaced and parallel relationship and affording respective pairs of upwardly-opening re-entrant slots which by alignment of the bar means may be brought into precise registry in two upwardly-converging planes intersecting at an angle of at least about 60.degree. and at most about 75.degree. and in which are engaged the hinge-remote edges of the plates.
Dependencies are inferred from the claim text.