| 摘要 |
Improvements in the subject of main patent no. 9001291 for: Board of improved composition for tables, which consist in locating the raising and lowering ramps of the concealable section joined in an articulated manner at one end and mutually aligned, lying under the upper horizontal arms of the tubes in a U-section and locating the shafts of several small rotatable rollers, perpendicular to the vertical wall of the tube referred to, such small rollers being located at a height which is under the rear part of each ramp, such that through the forwards and backwards movements of the opposite ends of the board of the table, these latter acting as a rotary limit, exert pressure, in a rotary manner, against the back of the respective ramp which same in some cases rises and with it the central concealable section of the table and in others descends together with the central concealable section. <IMAGE>
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