Stack chair

Claim 1

A STACK CHAIR COMPRISING A RIGID CHAIR STRUCTURE INCLUDING A SEAT, A BACK REST, FRONT LEGS AND REAR LEGS, SAID REAR LEGS BEING DISPOSED BEYOND THE SIDE EDGES OF SAID SEAT, A PAIR OF FRONT STACKING BRACKETS MOUNTED ON THE FRONT SIDE OF SAID BACK REST ADJACENT THE SIDES EDGES THEREOF AND DEFINING UPWARDLY FACING SHOULDER SURFACES, A PAIR OF REAR STACKING BRACKETS MOUNTED ON THE REAR SIDE OF SAID BACK REST ADJACENT THE SIDE EDGES THEREOF AND DEFINING DOWNWARDLY FACING SHOULDER SURFACES, SAID FRONT BRACKETS PROJECTING BEYOND THE FRONT SIDE OF SAID BACK REST AND SAID REAR BRACKETS PROJECTING BEYOND THE REAR SIDE OF SAID BACK REST, THE FRONT AND REAR BRACKETS AT EACH SIDE OF THE CHAIR BEING LOCATED APPROXIMATELY IN A COMMON PLANE PARALLEL TO THE SIDES OF THE CHAIR AND SAID SHOULDER SURFACES OF THE FRONT BRACKETS BEING SPACED ABOVE SAID SHOULDER SURFACE OF THE REAR BRACKETS A DISTANCE WHICH IS GREATER THAN THE THICKNESS OF SAID SEAT, WHEREBY ONE CHAIR MAYBE STACKED ON TOP OF ANOTHER WITH THE REAR LEGS OF THE UPPER CHAIR STRADDLING THE SEAT OF THE LOWER CHAIR AND THE DOWNWARDLY FACING SHOULDER SURFACES OF THE REAR STACKING BRACKETS ON THE UPPER CHAIR RESTING ON THE UPWARDLY FACING SHOULDER SURFACES OF THE FRONT STACKING BRACKETS ON THE LOWER CHAIR TO SUPPORT THE UPPER CHAIR ON THE LOWER CHAIR WITH THE BACK REST AND SEAT OF THE UPPER CHAIR RETAINED OUT OF PRESSURED CONTACT WITH THE BACK REST AND SEAT, RESPECTIVELY, OF THE LOWER CHAIR.