Tent – canopy – umbrella – or cane – Portable shelter – Plural shelters – shelter having plural compartments – or...
Patent
1981-06-05
1984-02-28
Pinkham, Richard G.
Tent, canopy, umbrella, or cane
Portable shelter
Plural shelters, shelter having plural compartments, or...
135102, 135106, 52 63, E04B 1347
Patent
active
044337000
ABSTRACT:
A collapsible panel structure consisting of at least one rod member, restraint elements secured to the rod member and a removable stress device acting to exert a continuous force between the rod member and the restraint elements. In one modification, two rod members have attached thereto a sheet of flexible material or fabric which acts as the restraint elements. Additional cable restraints can be employed joining the outer ends of adjacent rod members. The rod members are slightly bowed, and a bar member is secured centrally thereto in substantially chordal relationship. The stressing member rolls or slides on one bar member and pivots on the other. The stressing member is a slightly precambered one-piece rod or tube of spring material, carrying bifurcations at both of its ends to partially encompass the chord members, one bifurcation acting as a pivot and the other as a slide. The stressing member is forced along one bar member, to substantially dead center position, which action causes the bow in the stressing member to increase, thereby generating a continuously acting force on the restraint elements to thereby form a self-supporting structure. The sheet of flexible material rests on top of the stress-producing member, and when used as a cover for an excavation, any load such as wind or earth thrown on top of the flexible material, will act to increase the force generated by the stressing member, which in turn will act as a support for said load, preventing downward bowing of the flexible member.
REFERENCES:
patent: 1814811 (1931-07-01), Kramer et al.
patent: 2611427 (1952-09-01), Du Mais et al.
patent: 3051185 (1962-08-01), Reynolds
Brown T.
Pinkham Richard G.
Tomlin Carl W.
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