| 摘要 |
A FRONT PORTION OF A SEAT (2) IS CONNECTED TO A BASE (6) BY A FRONT SUPPORT LINK (7) AND A FIRST SUPPORT SHAFT (8), AND A REAR PORTION OF THE SEAT (2) IS CONNECTED TO A ROCKING FRAME (11) BY WAY OF REAR SUPPORT LINK (14). THE FIRST SUPPORT SHAFT (8) IS SLIDABLY FITTED TO THE BASE (6). AN UPPER PORTION OF THE BACKREST (3) IS ATTACHED TO AN UPPER PORTION OF A BACK FRAME (12). WHEN A PERSON IS SEATED, THE SEAT (2) IS MOVED DOWN AND MOVED BACK, AND A LUMBER SUPPORT PORTION (17A) OF THE BACKREST (3) IS MOVED FORWARDLY IN COOPERATION WITH MOVEMENT OF THE SEAT (2). THEREFORE, EVEN WHEN A PERSON IS SHALLOWLY SEATED ON A CHAIR, THE WAIST PORTION OF THE PERSON CAN PRECISELY BE SUPPORTED. THE COOPERATIVELY MOVING MEANS INCLUDES A COOPERATIVELY MOVING LINK MECHANISM COMPRISING A FIRST THROUGH A FIFTH COOPERATIVELY MOVING LINK (43, 46, 48, 21 AND 20). THE THIRD LINK (48) CAN BE PIVOTED TO RETURN AGAINST AN ELASTICITY OF A SECOND RETURNING SPRING (49). THEREFORE, A PERSON IS NOT HAMPERED FROM BEING SEATED THEREON DEEPLY.
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