Chair

A - Human Necessities – 47 – C

Patent

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Details

A47C 1/031 (2006.01) A47C 3/02 (2006.01) A47C 7/40 (2006.01)

Patent

CA 2619738

A chair in which the front part of a seat (2) is connected to a base (6) through a front support link (7) and a first pivot shaft (8), and the rear part of the seat (2) is connected to a swing frame (11) through a rear support link (14). The first pivot shaft (8) is slidably fitted to the base (6). The upper part of a backrest (3) is mounted on the upper part of a back frame (212). When a person sits on the chair, the seat (2) is lowered and moved backward, and the lumbar support part (17a) of the backrest (3) is moved forward in conjunction with the movement of the seat (2). Accordingly, even if the person sits forward on the chair, the lumbar support can accurately support the waist portion of the person. An interlocking means comprises an interlocking link mechanism formed of first to fifth interlocking links (43), (46), (48), (21), and (20). The third link (48) can be reversely rotated against the elasticity of a second return spring (49). As a result, the person is not obstructed to sit backward on the seat.

Cette invention concerne une chaise dont la partie avant d~un siège (2) est raccordée à une base (6) par un montant de support avant (7) et un premier arbre de pivot (8), et dont la partie arrière du siège (2) est raccordée à un châssis basculant (11) par un montant de support arrière (14). Le premier arbre de pivot (8) est inséré de manière coulissante dans la base (6). La partie supérieure d~un dossier (3) est montée sur la partie supérieure d~un châssis arrière (212). Lorsqu~une personne s~assoit sur la chaise, le siège (2) s~abaisse et recule, et une partie de soutien lombaire (17a) du dossier (3) avance en relation avec le mouvement du siège (2). Ainsi, même si la personne s~assoit sur l~avant de la chaise, la partie de soutien lombaire peut parfaitement épouser la taille de la personne. Un moyen de verrouillage comprend un mécanisme solidaire formé de cinq maillons de verrouillage (43, 46, 48, 21 et 20). Le troisième maillon (48) peut tourner en sens inverse par opposition à l~élasticité d~un second ressort de rappel (49). Ainsi, rien n~empêche la personne de s~asseoir sur l~arrière de la chaise.

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