A posture system with a lumbar pad and a cervical pad either one or both of which may be used. The lumbar and cervical pads may be supported on a chair by arms which can be bent to a desired position which position is retained until sufficient force is applied to place the arms into a different position....http://www.google.fr/patents/US6299248?utm_source=gb-gplus-shareBrevet US6299248 - Posture system
