Spring unit.

摘要

A plurality of main springs (3) and a plurality of intermediate support springs (4) are arranged on a rectangular base plate (1). The main springs (3) are disposed such that these connecting rod portions (8) are perpendicular to each other in a matrix form. One end of the coil spring (7) of the main spring (3) is fastened to the frame (6). The other end of each of the coil springs (7) is fastened to the base plate (1). The one end of each of the two coil spring portions (10) is fixed to the connecting rod portion (8) of the corresponding main spring (3). The other end of each of the two coil spring portions (10) is fastened to the base plate (1).