WEIGHT ADJUSTMENT MEANS FOR ADJUSTING SEAT PLATFORMS AND BACK RESTS OF CHAIRS, IN PARTICULAR OFFICE SWIVEL CHAIRS.

摘要

A PEDESTAL SUPPORTED CHAIR SUCH AS A SWIVEL TYPE CHAIR IN WHICH A SEAT PLATE CARRIER PIVOTED TO A BASE MEMBER FIXED TO THE PEDESTAL AND HAVING A BACK REST CARRIER IS PROVIDED WITH ADJUSTMENT MEANS OPERABLE OVER RANGE OF USER WEIGHTS FOR ADJUSTING A TORSION SPRING MOUNTED WITH ITS WINDINGS ON THE PIVOT BY WHICH THE SEAT PLATE CARRIER IS MOUNTED TO THE BASE MEMBER. FIRST LEGS OF THE SPRING MEMBER ENGAGE THE SEAT PLATE CARRIER AND SECOND SPRING LEGS ARE CONNECTED TO A HOLDER SUPPORTED FROM THE BASE MEMBER. ROTATION OF A SHAFT PASSING THROUGH THE HOLDER MOVES THE HOLDER TOWARDS OR AWAY FROM THE BASE MEMBER AND RESULTS IN GREATER OR LESSER TIGHTENING OF THE WINDINGS OF THE TORSION SPRING TO COMPENSATE IN CORRESPONDING MANNER FOR THE GREATER OR LESSER WEIGHT LOADINGS WHICH CAN BE IMPOSED ON THE SEAT PLATE CARRIER AND ON A CHAIR BACK REST CARRIER WHEN A USER WHOSE WEIGHT WILL BE ANY ONE SUCH IN A RANGE OF WEIGHTS, SETS A POSITIONING RELATIONSHIP BETWEEN THE SEAT ELEMENT AND BACK REST INTENDED TO BE THAT MOST COMFORTABLE TO THE USER.