Positionable chair

Claim 1

A POSITION CHAIR COMPRISING IN COMBINATION, A BASE A CHAIR FRAME INCLUDING A SEAT, FIRST LINKAGE MEANS MOUNTING SAID CHAIR FRAME WITH RESPECT TO THE BASE FOR MOVEMENT BETWEEN AN UPPER AND FORWARD POSITION AND A LOWER AND REARWARD POSITION RELATIVE TO SAID BASE, A BACKREST MOUNTED TO SAID CHAIR FRAME FOR SWINGING MOVEMENT RELATIVE THERETO BETWEEN A GENERALLY UPRIGHT POSITION AND AN INCLINED POSITION, SECOND LINKAGE MEANS CONNECTING SAID BACKREST TO SAID FIRST LINKAGE MEANS TO CAUSE MOVEMENT OF SAID CHAIR FRAME INTO ITS UPPER AND FORWARD POSITION WHEN THE BACKREST IS SWUNG TO AN INCLINED POSITION, SAID FIRST LINKAGE MEANS INCLUDING A MAIN PORTION EXTENDING FROM SAID BASE REARWARDLY TOWARD SAID BACKREST AND HAVING ONE END PIVOTALLY CONNECTED TO SAID BASE AND AN OPPOSITE END PIVOTALLY CONNECTED WITH RESPECT TO SAID CHAIR FRAME, SAID SUPPORT LINK FURTHER INCLUDING A CRANK PORTION RIGIDLY PROJECTING AT AN ANGLE BEYOND SAID OPPOSITE END OF SAID MAIN PORTION GENERALLY IN THE DIRECTION OF SAID BASE, SAID SECOND LINKAGE MEANS INCLUDING A BACKREST LINK HAVING A FIRST PORTION FIXED WITH RESPECT TO SAID BACKREST AND A SECOND, CRANK PORTION RIGIDLY PROJECTING AT AN ANGLE FROM SAID FIRST PORTION AND IN A GENERALLY FORWARD DIRECTION WITH RESPECT TO THE CHAIR, SAID CRANK PORTIONS BEING PIVOTALLY INTERCONNECTED GENERALLY AT THEIR FREE ENDS SUCH THAT MOVEMENT OF SAID BACKREST