Patent ID: 7144080

Claim:
A chair comprising a first rigid support structure, a seat connected to the first support structure, a second rigid support structure crisscrossingly connected to the first support structure such that the first and second supports form an X configuration when the chair is set up in a use position, and may be pivoted toward a substantially parallel configuration in a compact position for storage or transport, a locking knee support structure fixedly connectable to the first and second support structures to form a rigid triangular configuration stabilizing the chair in its use position, wherein the locking structure can be disconnected from at least one of the support structures allowing the support structures to pivot into the compact position, and guide plates defining a plurality of slots under the knee support structure for receiving a pivot rod connected to the first support structure, the effective length of the knee support structure between first and second support structures being adjustable by locating the pivot rod in different slots, thereby changing the seating orientation of the chair.