| 摘要 |
<p>It is characterized in that between the springs (1) are arranged means (2) with displacement capabilities so that they may take a position which does not interfere with the springs (1), in which case a predetermined hardness is obtained, or they may take an intercalary position in the height of the springs (1) whereby the elastic length of the springs is varied and consequently their hardness is increased. In another embodiment, the means arranged between the springs (1) are susceptible of modifiying their volume, whereby with the smaller volume they do not interfere in the structure of the springs and with the larger volume they are introduced in the structure of the springs, in order to regulate the hardness of the mattress, seat and the like.</p> |
