| 摘要 |
Insertable armrest frame and mounting structure is designed so that an upholstered, pivotable armrest can be easily attached to an upholstered seat back in such a manner that the mounting elements will be concealed. The mounting and support structure is quite light in weight but very strong due to use of either a channel shaped arm frame member or a molded frame member. The arm frame pivots on one pivot pin anchored to the seat back frame and, in the channel shaped version, includes a strengthening rib incorporating a cup-shaped portion having a curved flat rim which is slightly resiliently deformed by a flanged retaining nut on a stop pin which is also anchored in the seat back frame. The resilient deformation of the rim, which also takes place in the molded arm version, provides uniform tension which tends to hold the arm in any position to which it is rotated. An enlarged opening and a detent formed adjacent one end of the curved rim permit the arm to be easily assembled to the pivot pin and stop pin with a push and turn movement while preventing its unauthorized removal. An adjustment screw on the arm frame controls the angle of the arm in its use position. A generally U-shaped tubular support frame provides a very rigid mounting for the armrest and functions somewhat as a torque tube to transmit loads to the opposite side of the seat frame.
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