| 摘要 |
The invention concerns an elastic device placed between the girder (1) of a rest bar frame and the joining piece (2), preferably at the shoulder recess. Said elastic device comprises a fixed plate (5), backed on to the internal face of the girder (1), a supporting plate (7) associated with said plate (5) by means of a T-shaped catch, mobile with respect to the latter and guided in a groove (14) in the form of an elongated slot. An elastic member (11) is placed between the two plates, fixed at its lower part on said plate by means of a pin (12). All the elements of this supporting device are made in a suitable plastic material and the hardness of the elastic member (11) is chosen according to requirements.
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