Folding chair with concealed linkage

Claim 1

A FOLDING CHAIR INCLUDING A BACK FRAME WITH BACK LEGS, A SEAT, A FRONT FRAME WITH FRONT LEGS, EACH OF THE FRAMES HAVING A RAIL AT SUBSTANTIALLY THE HEIGHT AT WHICH THE SEAT IS LOCATED WHEN THE CHAIR IS IN SET UP CONDITION, SAID RAIL BEING RIGIDLY CONNECTED WITH THE LEGS OF ITS FRAME, A SEAT BRACKET RIGIDLY ATTACHED TO THE SEAT, A FRONT BRACKET RIGIDLY CONNECTED TO THE FRONT FRAME AND PIVOTALLY CONNECTED WITH A FORWARD PORTION OF THE SEAT BRACKET, A BACK BRACKET RIGIDLY CONNECTED TO THE BACK FRAME, A FIRST LINK PIVOTALLY CONNECTED AT ONE END THE BACK BRACKET AND AT THE OTHER END TO A REARWARD PORTION OF THE SEAT BRACKET, A SECOND LINK THAT IS PIVOTALLY CONNECETED AT ONE END TO THE FRONT BRACKET AT A LEVEL LOWER THAN THE PIVOT CONNECTION OF THE FRONT BRACKET TO THE SEAT BRACKET, AND A THIRD LINK THAT IS PIVOTALLY CONNECETED AT ITS FORWARD END TO THE SECOND LINK AT A LOCATION INTERMEDIATE THE OTHER PIVOT CONNECTIONS OF THE SECOND LINK AND THAT IS PIVOTALLY CONNECTED AT ITS REARWARD END TO THE BACK BRACKET AT A LEVEL LOWER THAN THE PIVOT CONNECTION OF THE BACK BRACKET TO THE FIRST LINK, AND CHARACTERIZED BY THERE BEING TWO SYSTEMS OF BRACKETS AND LINKS, ONE FOR EACH SIDE OF THE CHAIR, THE PIVOT CONNECTIONS ON THE BRACKETS FOR THE LINKS AND THE LINK SYSTEMS BEING SPACED INWARD FROM THE SIDES OF THE SEAT AND FROM THE LEGS OF THE FRAMES, EACH OF THE LINK SYSTEMS HAVING A FRONT BRACKET AT ITS FORWARD END CONNECTED TO THE RAIL OF THE FRONT FRAME AND EXTENDING ALONG THE RAIL TO AND ACROSS A PORTION OF A FRONT LEG AND BEING ALSO CONNECTED TO THE FRONT LEG TO SRCURE THE RAIL AND THE FRONT LEG TO ONE ANOTHER, AND HAVING A BACK BRACKET CONNECTED TO THE RAIL OF THE BACK FRAME AND EXTENDING ALONG THE RAIL TO AND ACROSS A PORTION OF A BACK LEG AND BEING ALSO CONNECTED TO THE BACK LEG TO SECURE THE RAIL AND BACK LEG TO ONE ANOTHER.