Height adjustment device, particularly for the seat back...

A - Human Necessities – 47 – C

Patent

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Details

A47C 7/40 (2006.01) A47C 1/03 (2006.01)

Patent

CA 2363247

A height adjustment device, in particular for seat back portions and arm-rests in office chairs, comprising a guide element (14, 48) rigid with the support plate (10) for the seating portion (12), a slide (22, 42) supporting the movable part (18, 20) and engagable with and slidable along said guide element, and means (38) selectively engagable in one of a plurality of teeth (31) to provide a .configuration of stability, said selectively engagable means sliding freely along the passive flanks of the teeth of the toothed portion during the raising of the movable pan, and lockable by the active flanks each time a tooth is passed over, said selectively engagable means being disengagable, for a predetermined position of said slide (22, 42) relative to said guide element (14, 48), from said teeth thus enabling said slide to move by gravity along said guide element, characterised in that said toothed portion (28) is faced by a toothed counter-portion (32) the teeth (34) of which form with the teeth (31) of said toothed portion (28) a mixed-line channel, the roots (30, 33) of the teeth (31, 34) of said toothed portion (28) and counter-toothed portion (32) forming respectively the seat of stable configuration and of temporary obstacle to the movement of said selectively engagable means along the mixed--line channel.

L'invention concerne un dispositif de réglage de la hauteur, destiné notamment aux dossiers et aux accoudoirs des chaises de bureau. Ledit dispositif comprend un élément (14, 48) de guidage, solidaire de la plaque (10) de support de la partie assise (12), une coulisse (22, 42) portant la partie mobile (18, 20), qui peut venir au contact de l'élément de guidage et coulisser le long de celui-ci, et des moyens (38) pouvant sélectivement venir au contact d'une dent parmi une pluralité de dents (31) afin d'offrir une configuration de stabilité, ces moyens de contact sélectif coulissant librement le long des côtés passifs des dents de la partie dentée lorsqu'on soulève la partie mobile, et pouvant être verrouillés par leurs côtés actifs à chaque passage de dent, lesdits moyens de contact sélectif pouvant être désolidarisés, dans une position prédéterminée de la coulisse (22, 42) par rapport à l'élément (14, 48) de guidage, des dents, ce qui permet à la coulisse de se déplacer, sous l'effet de la gravité, le long de l'élément de guidage. Le dispositif est caractérisé en ce que la partie dentée (28) fait face à une contre-partie dentée (28), les dents (34) de cette contre-partie formant avec le dents (31) de la partie dentée (28) un passage à ligne mixte, les bases (30, 33) des dents (31, 34) de la partie dentée (28) et de la contre-partie dentée (32) permettant de constituer respectivement le siège à configuration stable et un obstacle temporaire au mouvement des moyens de contact sélectif le long du passage à ligne mixte.

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