A wheelchair is provided which has a seat height adjustment comprised of a in-line turnbuckle that allows infinite adjustment of the length of a turnbuckle assembly. The assembly includes a handgrip with a longitudinal recess having a first end with smaller internal threads that mate with the external...http://www.google.sh/patents/US6419253?utm_source=gb-gplus-sharePatent US6419253 - Wheelchair having a double turnbuckle height adjustment
