초록 ▼

A chair shell of resilient material such as polypropylene comprises a back support 12 and a seat portion 14. The natural deformability of the back support 12 is modified by slits 22, 24 and holes 32, 34, 36 so that under pressure from the back of a sitter resting against the back support the support

A chair shell of resilient material such as polypropylene comprises a back support 12 and a seat portion 14. The natural deformability of the back support 12 is modified by slits 22, 24 and holes 32, 34, 36 so that under pressure from the back of a sitter resting against the back support the support is resiliently deformed into a shape which, in vertical section, includes a convex curve positioned properly to support the sitter\s spine in the lumbar region and which is horizontal in convex section. The deformability of seat 14 can be modified by slits 42, 44 and holes 42, 46, 48, 50, 54 to provide softer rear and front zones 44 and 52 to reduce the pressure on the ischial tuberosities and lower thighs of the sitter. The chair shell provides comfortable and orthopaedically desirable support while avoiding the need for thick upholstery. The undeformed state of the chair shell may be designed to allow the chairs to be easily stacked.

대표청구항 ▼

A chair shell of resilient material comprising a back support and a seat, in which: an aperture is formed in the chair shell at the junction of the back support and the seat, the opening extending almost to the lateral edges of the chair shell, the back support has an upper portion and a lower porti

A chair shell of resilient material comprising a back support and a seat, in which: an aperture is formed in the chair shell at the junction of the back support and the seat, the opening extending almost to the lateral edges of the chair shell, the back support has an upper portion and a lower portion, the upper portion of the back support has zones of weakness arranged to modify the deformability of the back support so that when the back support is flexed under pressure from the back of a sitter the said upper part is deformed to a shape which is forwardly convex in vertical section and forwardly concave in horizontal section, the lower portion of the back support is divided into two portions by a centrally disposed slit which extends upwards from the said aperture, the two portions being adapted to flex under pressure from the back of a sitter in such a manner that the lower edges of the said portions move backwards to increase the convexity of the back support in vertical section and the inner edges of the said portions move backwards to increase the concavity of the back support in horizontal section, the said seat has a rear portion, a middle portion and a front portion, said rear portion of the seat being constructed to be deformed resiliently backwards under pressure from the ischial tuberosities of the sitter, said front portion of the seat being constructed to be resiliently deformed downwards under pressure from the under-thighs of the sitter.