Chairs and seats – Bottom or back – Framework
Patent
1978-07-17
1980-03-04
Mitchell, James C.
Chairs and seats
Bottom or back
Framework
297452, A47C 702
Patent
active
041914244
ABSTRACT:
A support grid for upholstered seating of the "bucket" type, consisting of a series of closely space transversely extending spring cross wires defining the main cushion area of either a seat bottom or a seat back, connected at their respective ends to a pair of side spring wires, and angled upwardly and outwardly from the side wires to form the seat "wings" or bolsters, the novelty of the invention lying in the connection of the cross wires to the side wires, in which each cross wire has an S-bend formed therein in a plane normal to the main cushion area, the loop of the S-bend adjoining the main cushion area containing the associated side wire, whereby loading of the associated wing portion tends to open said loop rather than clamping it more tightly about the side wire, so that metal fatigue is reduced, and the other loop of the S-bend opening outwardly, tending to distribute the flexure strains along a longer section of the wire to further reduce metal fatigue, selection of the radius of curvature of this last named loop serving to adjust the stiffness or resistance to flexure of the wing portion. The grid may be used as a spring base for upholstery padding by suspending the side wires thereof resiliently from a rigid seating frame, or may be completely encapsulated in an elastic foam pad supported in a "pan" formed by the seating frame, in which case it serves as reinforcement for the pad.
REFERENCES:
patent: 3727980 (1973-04-01), Tischler
patent: 3762770 (1973-10-01), Tedesco et al.
patent: 3797886 (1974-03-01), Griffiths
patent: 3880467 (1975-04-01), Tischler
Flex-O-Lators Inc.
Hamilton John A.
Mitchell James C.
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