A - Human Necessities – 47 – C
Patent
A - Human Necessities
47
C
A47C 7/46 (2006.01) A47C 4/54 (2006.01)
Patent
CA 2144903
The present invention provides an improvement in a lumbar support in the chair back for engaging a chair occupant's lumbar region. The lumbar support includes a pocket within the chair back and a lumbar cushion, of a particular cross-sectional shape is completely disposed within that pocket and sited approximately complementary to a person's lumbar region. The lumbar cushion includes a unitary, open-cell, elastically-resilient cushion of foam, the cushion of foam being fixed within a flexible, air- impermeable envelope. The foam has an air inlet/outlet conduit directly leading thereinto, and an opening extend- ing through the flexible, air-impermeable envelope. A valve structure in the inlet/outlet tube is provided for controlling gas pressure within the cushion of foam for adjusting the firmness of the lumbar support means in the chair in a position accessible to a chair occupant. The valve structure includes a guide tube secured to the open- ing in the air inlet/outlet conduit. An air-impermeable plug, is manually-slidable within the guide tube between an open position, allowing flow of air, and a resiliently- biased closed position stopping flow of air. A manually- actuatable member is disposed within the tubular member and is secured to the air-impermeable plug for moving the air- impermeable plug between the two positions. An outer flange forming part of the guide tube is secured by its side face to a side of the chair back.
Bereskin & Parr
Global Total Office
Tedesco Romeo
LandOfFree
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