Stackable chair with foldable back and arm rests

A chair comprising:

• a seat;
• two pairs of legs supporting the seat on respective sides thereof, with the legs in each pair converging upwardly and being interconnected above the seat by a respective top tie;
• an arm rest displaceable longitudinally on each tie and adjustable in position thereon by means of a co-operating rack and stop finger;
• a back pivotally mounted to the seat;
• two two-axis hinge devices connecting the back to each of the two arm rests, respectively, with a first axis of each hinge device extending substantially along the line of greatest slope of the back and with the second axis of each hinge device being substantially perpendicular to the first axis and parallel to the axis about which said back is pivotally mounted to said seat;
• each hinge device being disposed behind the back on a marginal member thereof, and projecting far enough to enable the corresponding arm rest to pass from an outside position relative to said marginal member to an inside position relative thereto by pivoting about said first axis, said inside and outside positions being substantially 180.degree. apart;
• and
• each arm rest being capable, at least when in each of said outside and inside position, of pivoting about said second axis, thereby enabling said arm rest, when in its outside position, to engage on th corresponding tie when the back is in its raised position, and enabling said arm rest, when in its inside position, to be pressed flat against the rear face of the back until the back rests against the seat.