| 摘要 |
The frame of an article of reclining furniture supports an under-mattress which comprises a back member, a thigh member and a foot member. The back member is mounted for pivotal movement about an axis in such a manner that upon pivotal displacement the inner end portion thereof is moved under the pivot axis and forms a sitting depression. An intermediate member is freely inserted between the back member and the thigh member. This intermediate member is suspended at the adjacent ends of the back member and the thigh member by joints. Therefore, together with the back member and the thigh member, which is movable with the foot member longitudinally of the article, the intermediate member forms a system of joints which responds to magnitude and point of attack of the load and compensates for anatomical differences and permits the occupant any desired change of his sitting position. Depending upon whether the person changes his position forwards or backwards, the intermediate member will be flush with the back member or the thigh member and thereby ensure always a correct support of the entire spine. The movable connection of the intermediate member with the adjacent ends of the back member and the thigh member is effected preferably by an elastic joint whose two limbs of which include teeth, so that in its closed position the joint may absorb without difficulty even vertical continuous loads.
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