Portable massage chair

1. 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.

2. The chair of claim 1 , wherein the locking structure carries a at least one knee support pad.

3. The chair of claim 1 , wherein the locking structure is pivotally connected to the first support structure.

4. The chair of claim 1 , wherein the locking structure is pivotally connected to the second support structure.

5. The chair of claim 1 further comprising

a chest rest attached to the second support structure.

6. The chair of claim 5 , wherein the position of the chest rest relative to the second support structure is adjustable.

7. The chair of claim 6 , wherein the chest rest is attached to the second support structure via a multi-disc friction clamp.

8. The chair of claim 5 further comprising

a face rest attached to the chest rest.

9. A chair comprising

plural leg structures,

a seat connected to at least one of the leg structures,

a chest rest assembly connected to a first leg structure for supporting a person in a forward leaning position, the chest rest assembly having a chest support connected to an adjustment device that allows adjusting of the orientation of the chest support relative to the first leg structure, the adjustment device including an alternating series of circular and rectangular disks, the rectangular disks having a keyed orientation relative to the first leg structure, the circular disks having a keyed orientation relative to the chest support, and a clamp device that locks and unlocks relative movement of the rectangular and circular disks relative to each other.

10. The chair of claim 9 , wherein the adjustment device has a handle for providing manual control of the clamp device.

11. The chair of claim 9 , wherein the adjustment device permits longitudinal and rotational movement of the of the chest support when the clamp device is unlocked.

12. The chair of claim 9 , wherein the first and second disks having interlocking circular groove and ridge patterns which frictionally engage each other when the clamp device is in a locking position.

13. The chair of claim 9 , wherein the first leg structure is crisscrossingly connected to a second leg structure such that the first and second leg structures 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.

14. The chair of claim 13 further comprising

a locking structure connectable to the first and second leg 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 leg structures allowing the leg structures to pivot into the compact position.

15. The chair of claim 14 further comprising

at least one knee support pad connected to the locking structure.