Chairs and seats – Bottom or back – Framework
Patent
1981-01-21
1983-12-06
Zugel, Francis K.
Chairs and seats
Bottom or back
Framework
297458, 297460, 297DIG2, A47C 702
Patent
active
044189583
ABSTRACT:
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.
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patent: 3756656 (1973-09-01), Weick
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