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An umbrella construction is provided which consists of a central rod and a canopy adapted to be supported thereupon. A plurality of ribs are pivotally connected to the support and a plurality of struts are pivotally connected between the central rod and the respective ribs. Nylon fixtures are employ

An umbrella construction is provided which consists of a central rod and a canopy adapted to be supported thereupon. A plurality of ribs are pivotally connected to the support and a plurality of struts are pivotally connected between the central rod and the respective ribs. Nylon fixtures are employed for pivotally receiving the proximal ends of the struts and ribs with respect to the central rod. A further Nylon fixture is provided for pivotally connecting each strut to its associated rib. The ribs are provided with fixtures at the opposite extremities thereof for purposes of engaging the canopy and for purposes of pivotally engaging the Nylon fixture on the central rod. The ribs and struts are fabricated from fiber glass consisting of strands of fiber glass embedded in a polyester resin matrix.

대표청구항 ▼

An umbrella construction comprising a central rod constituting a support, a canopy adapted to be supported by said support, a plurality of ribs pivotally connected to said support and adapted to support said canopy selectively in stretched and collapsed conditions, a control means slidable on said c

An umbrella construction comprising a central rod constituting a support, a canopy adapted to be supported by said support, a plurality of ribs pivotally connected to said support and adapted to support said canopy selectively in stretched and collapsed conditions, a control means slidable on said central rod, and a plurality of struts pivotally connected to said control means and to respective of said ribs whereby the ribs can be bundled against said rod or extended radially outwards from the same to stretch said canopy, each said rib including fiber glass and a plastic matrix in which the fiber glass is embedded, said struts each including fiber glass and a plastic matrix which the fiber glass is embedded, the plastic matrices being of isophthalic polyester resin, the ribs being in the order of 55-60% of fiber glass and a balance of matrix, the ribs and struts being of a diameter in the order of magnitude of 0.250-0.300 inches, the fiber glass being 50 or 113 yield fiber glass, the fiber glass in each matrix having the following characteristics with values of the following order of magnitude: Flexural modulus: 1,640,000 p.s.i. Tensile strength: 13,200 p.s.i. Izod notch strength: 8.5-11.1 ft. lbs. Barcol hardness: 26, the ribs and struts being rods which are formed by being drawn through a hot die in a pultrusion process.