Device for adjusting the height and or curvature of an elastically flexible supporting component of a seat back

Claim 2

Apparatus for the level adjustment and/or arching adjustment of a flexibly resilient support element for the lordosic vertebrae of a sitting person, and which is fitted in the frame of a back rest of a seat, each apparatus for level adjustment and/or arching adjustment comprising a gear mechanism (12) including a worm a worm wheel a pinion (16) a tooth element as well as a drive means, characterised in that the gear mechanism is ,ectly connected to the drive means in such a manner that the rigid drive shaft (13) thereof carries the worm (14) engaging into the worm wheel the pinion (16) being fixed axially in the worm wheel (15) in tooth engagement with a gear wheel (17) in a plane parallel to the worm gear The gear wheel (17) being associated with at least one reel (21) to which the one end of the sheathed cable (23) of a Bowden cable assembly (24) is fixed and onto which it can be wound, the gear wheel (17) comprising a web (34) which coacts with stop formations (35) inside the casing (11) of the gear mechanism (12) to limit in a defined manner the movement of the gear wheel (17). A

Claim 3

Apparatus according to claim i, characterised in that the drive means is a manually operable handle.

Claim 4

Apparatus according to claim 1, characterised in that the drive means is an electric motor

Claim 5

Apparatus according to anyone of claims t to 3, characterised in that the reel (21) is fitted to the gear wheel (17) in an interchangeable manner.

Claim 6

Apparatus according to anyone of claims 1 to 4, characterised in that an adjustment Smeans interacts with the upper and the lower end of the support element for level V adjustment.

Claim 7

Apparatus according to anyone of claims 1 to 4, characterised in that for level adjustment at the upper or lower end of the support element an adjustment means and at the respectively opposite end of the support element one or more return spring(s) (31) i I i" i, connected to the frame is/are provided.

Claim 8

Apparatus according to anyone of claims 1 to 6, characterised in that the p' -tion and/or the stop surfaces are provided with a buffer (36). I~ s/ 4 ,T 0 -3- 7 Abstract The invention relates to an apparatus for the level adjustment and/or arching adjustment of a flexibly resilient support element for the lordosic vertebrae of a sitting person, and which is fitted in the frame of a back rest of a seat, each apparatus comprising a gear mechanism (12) including a worm a worm wheel a pinion (16) and a tooth element as well as a drive means. According to the invention the gear mechanism is directly connected to the drive means in such a manner that the rigid drive shaft (13) thereof carries the worm (14) engaging into the worm wheel the pinion (16) being fixed axially in the worm wheel (15) in tooth engagement with a gear wheel (17) in a plane parallel to the worm gear The gear wheel (17) being associated with at least one reel (21) to which the one end of the sheathed cable (23) of a Bowden cable assembly (24) is fixed and onto which it can be wound, the gear wheel (17) comprising at least one projection, which coacts with stop surfaces inside the casing (11) of the gear mechanism (12) to limit in a defined manner the movement of the gear wheel Preferably the drive means is an eiectric motor. Fig. 2.