Patent ID: 7032975

Claim:
Medical or dental treatment chair ( 1 ) comprising: a) a seat part ( 2 ), b) a back part ( 4 ), c) a carrier part ( 16 ) arranged on the back part ( 4 ), d) an intermediate lever ( 23 ) which has one end pivotably connected in a first joint ( 24 ) with the carrier part ( 16 ), e) a head support lever ( 27 ) which has one end pivotably connected in a second joint ( 25 ) to an opposite end of the intermediate lever ( 23 ), f) a head support pad ( 21 ) carried by the head support lever, g) an intermediate lever adjustment motor (M 3 ) which is effective between the carrier part ( 16 ) and the intermediate lever ( 23 ), and h) a head support lever adjustment motor (M 4 ) which is effective between the intermediate lever ( 23 ) and the head support lever ( 27 ) i) wherein the adjustment motors (M 3 , M 4 ) are linearly acting adjustment motors, j) whereby the intermediate lever adjustment motor (M 3 ) is pivotably supported at one end at a working spacing (V 1 ) from the first joint ( 24 ) between the carrier part ( 16 ) and the intermediate lever ( 23 ), k) wherein the intermediate lever adjustment motor (M 3 ) pivotably engages the intermediate lever ( 23 ), l) whereby the head support lever adjustment motor (M 4 ) is pivotably supported at one end on the intermediate lever ( 23 ) at a working distance (V 2 ) from the second joint ( 25 ), m) wherein the head support adjustment motor (M 4 ) pivotably engages an opposite end of the head support lever ( 27 ), n) wherein the head support lever adjustment motor (M 4 ) engages on a transverse arm ( 23 c ) of the intermediate lever ( 23 ), and o) whereby the transverse arm ( 23 c ) is angled relative to the intermediate lever ( 23 ) towards the head support lever ( 27 ), in an end region of the intermediate lever ( 23 ) adjacent the second joint ( 25 ).