Mechanism for adjusting a lumbar support of a back of a seat or the like

A mechanism for adjusting a lumbar support of a back of a seat or armchair or the like, more particularly office seats, motor vehicle seats or the like;

• (a) frame means in said seat back, said frame means having an elongated guide means extending in the longitudinal direction of said seat back;
• (b) support means mounted on said guide means for movement therealong in said longitudinal direction;
• (c) elongated means pivotally mounted at one end of said support means for movement in a plane transverse to the plane of said seat back;
• (d) a plate-like moulding mounted on the end of said elongated means opposite said one end thereof;
• (e) means mounted on said support means and connected to said elongated means to control the pivotal position of said elongated means;
• (f) a shaft;
• (g) means mounting said shaft on said support means, with its axis extending substantially in the plane of said seat back and transverse to said longitudinal direction of said seat back, for axial movement between first and second positions and for rotational movement;
• (h) at least one elongated toothed rack mounted in said seat back and extending in said longitudinal direction of said seat back;
• (i) first transmission means for coupling said shaft, when in said first axial position, to said control means such that rotation of said shaft pivots said elongated means to move said plate-like moulding along a path transverse to said plane of said seat back;
• and
• (j) second transmission means for coupling said shaft, when in said second axial position, to said at least one toothed rack such that rotation of said shaft moves said support means along said guide means to move said plate-like moulding along a path in said longitudinal direction of said seat back;
• (k) whereby said plate-like moulding may be adjusted by said shaft along both planes transverse to and substantially parallel to said longitudinal direction of said seat back.