| 摘要 |
A spring unit comprises a rectangular base plate, a rectangular frame, first main springs, second main springs, third main springs and fourth main springs arranged on the base plate, and intermediate support springs also placed on the base plate. Each of the first and third main springs has one straight rod portion and two coil portions which are connected at one end to the ends of the straight portion. Each of the second and fourth main springs has one straight rod portion and two torsion bar spring portions which are connected at one end to the ends of the straight rod portion. The first and second main springs are parallel to each other and alternately arranged on said rectangular base plate. The third and fourth main springs are parallel to each other and alternately arranged on said rectangular base plate, with the straight rod portions arranged at right angles to those of the first and second main springs. Clips fasten the other end of each coil portion and the other end of each torsion bar spring portion to the base plate. Other clips couple one end of each coil portion and one end of each torsion bar spring portion to the frame. Other clips couple one end of each support spring to the associated rod portion. Still other clips fasten the other end of each support spring to the base plate.
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