Seat for a wheeled carriage or chair

A wheeled carriage for children and disabled people having a seat and an undercarriage comprising a frame said carriage comprising:

• a. a multipart seat surface (11) mounted on at least one guiding means (18) and comprising a displaceable part that is displaceable between positions along the at least one guiding means (18);
• and
• b. a backrest (12) pivotally connected to the displaceable part of the multipart seat surface (11) by at least one tilting bearing (23) and pivotally connected to at least one base part (15) by at least one coupling element (33), with the at least one coupling element (33) displaceably mounted to the at least one guiding means (18);
• wherein pivoting the backrest (12) changes the longitudinal position of the displaceable part of the multipart seat surface along the at least one guiding means (18) by displacement of the at least one tilting bearing (23);
• the displaceable part of the multipart seat surface is mounted displaceably on the at least one guiding means, and the at least one guiding means is releasably mounted on the frame and the at least one guiding means comprises is coupled releasably to the frame by at least one coupling means, and the at least one coupling means is latching claws (17).