Lumbar support for a chair

Details Lumbar support for a chair Lumbar support for a chair

A - Human Necessities

47

C

A47C 7/02 (2006.01) A47C 1/032 (2006.01) A47C 5/06 (2006.01) A47C 7/40 (2006.01) A47C 7/46 (2006.01)

Patent

CA 2450026

.sim. An office chair with a chair back is disclosed, the back including a mesh material connected to a two-piece carrier, the carrier being deformable and stretchable. The carrier has a bottom edge including a groove and is engageable by tabs attached to a transverse member of a chair frame assembly. The upper ends of the carrier each includes an opening for receiving a spherical end portion of the upper end of the chair frame assembly. Engagement of the carrier with the chair frame assembly is accomplished by stretching the carrier and mesh between the transverse member and the spherical end portions. The chair back includes a lumbar support which is mounted to slide along the side edges of the carrier and along vertical supports of the chair frame assembly, the lumbar support causing the back to tension forwardly. The chair back is pivotal under the in,fluence of a chair user and is pivotally connected to the chair seat so as to cause the chair seat to also pivot in response.

L'invention concerne une chaise de bureau avec un dossier, ledit dossier comprenant un matériau de type maillé relié à un support constitué de deux éléments, ledit support pouvant se déformer et s'étirer. Ce support présente un bord inférieur qui comprend une rainure dans laquelle peuvent s'engager des languettes fixées à un élément transversal d'un ensemble châssis de chaise. Les extrémités supérieures du support comportent chacune une ouverture destinée à recevoir une partie d'extrémité sphérique de l'extrémité supérieure de l'ensemble châssis de chaise. L'assemblage du support à l'ensemble châssis de chaise s'effectue par étirement du support et du matériau maillé entre l'élément transversal et les parties d'extrémités sphériques. Le dossier de chaise comprend un support lombaire monté de façon à glisser le long des bords latéraux du support et le long des supports verticaux de l'ensemble châssis de chaise, ledit support lombaire faisant exercer au dossier une tension vers l'avant. Le dossier de chaise pivote selon les mouvements exercés par un utilisateur de la chaise, et est relié de manière pivotante au siège de la chaise afin d'entraîner celui-ci en pivotement par réaction.

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