| 摘要 |
<p>The device invented has two highly significant characteristics on which the whole principle is based: the multi-layering of the metal plate (3) and the two slots located in the narrow edges of the board (one on each side) The plate's multi-layering (3) acts as a guide for the unit made up of the interior melamine structure (5) together with the 2 tubes (1) located on each side of this. These metal tubes (1) have a hole at one end through which the thread of the knob (4) passes, up to the central melamine structure (1) where the anchor thread is located (this knob (4) means that no kind of tool is required). The side slots delimit the range of adjustment with a maximum (board height 190cm) and minimum (board height 170cm). This adjustment can be assisted by 1 or 2 springs (6) to help move the board with the minimum of effort.</p> |
