Chair control

Claim 1

IN A CHAIR HAVING A BASE, A VERTICAL POST SUPPORTED BY THE BASE, A CHAIR SEAT AND A CHAIR BACK, A CHAIR CONTROL COMPRISING, IN COMBINATION, A FIXED FRAME MOUNTABLE ON THE POST, A BACK FRAME MEMBER HAVING ONE END CONNECTED TO AND SUPPORTING SAID CHAIR BACK AND THE OTHER END PIVOTALLY ATTACHED TO THE FIXED FRAME FOR PIVOTAL MOVEMENT RELATIVE THERETO PERMITTING BACKWARD TILTING MOVEMENT OF THE CHAIR BACK FROM A NORMAL SUBSTNTIALLY UPRIGHT POSITION TO A RECLINING POSITION, AND A TENSION DEVICE YIELDABLY RESISTING THE BACKWARD TILTING MOVEMENT OF THE SEAT BACK FROM SAID NORMAL POSITION, SAID FIXED FRAME COMPRISING A PAIR OF SPACED-APART SPIDERS ATTACHABLE TO THE SEAT, AN U-SHAPED MEMBER HAVING A BASE AND SPACED-APART UPWARDLY EXTENDING ARMS, A PORTION OF EACH ARM ADJACENT THE TOP EDGE THEREOF BEING BENT TO FORM UPWARDLY PROJECTING PRONGS, SAID PRONGS BEING ENTERED IN SLITS FORMED IN THE SPIDER WHEREBY SAID U-FRAME IS PERMANENTLY CONNECTED THERETO, AND A CROSS-PLATE HAVING PRONGS ENTERED IN PRONG RECEIVING SLITS FORMED IN SAID UPRIGHT ARMS TO PERMANENTLY CONNECT THE CROSS-PLATE THERETO, AND A POST MONT CARRIED BY SAID BASE CONSISTING OF AN INVERTED UFRAME HAVING PRONGS PERMANENTLY CONNECTING THE U-FRAME TO THE BASE AND HAVING A POST RECEIVING OPENING REGISTERING WITH A POST RECEIVING OPENINGS FORMED IN SAID BASE; SAID BACK FRAME BEING FORMED FROM A SINGLE PIECE OF SHEET METAL WITH DOWNTURNED SIDE PORTIONS AND HAVING THE FORWARD ENDS THEREOF PIVOTALLY CONNECTED TO SAID ARMS, SAID FORWARD ENDS HAVING INWARDLY PROJECTING ENDS PORTIONS FORMING A PRESSURE PLATE, THE LEADING EDGE OF EACH END PORTION BEING RECESSED TO FORM A SEAT FOR ONE END OF A SPRING FORMING PART OF SAID TENSION DEVICE AND THE REAR EDGE OF SAID PRESSURE PLATES HAVING AN INTEGRAL DOWNTURNED FLANGE FORMING A STOP MEMBER ENGAGEABLE WITH SAID CROSSPLATE, SAID SPRING MEANS REACHING BETWEEN SAID CROSS-MEMBER AND SAD BACK FRAME TO YIELDINGLY RESIST BACKWARD TILTING MOVEMENT OF THE CHAIR BACK.