| 摘要 |
The device includes three parallel branches (2,3,4) located one above the other. A lower front plate (5') which connects the central (3) and lower (4) branches is in two parts. It is composed of two plates (6,7) perpendicular to the branches and connected by a single piece. One plate has several projecting dovetail parts (6') parallel to the branches and the other has corresponding grooves (7') in which the dovetails (6') fit. The spacing between the dovetails and the grooves (6',7') is identical. A right angled leg (8) is fixed to the riser (9) and is connected on the side of the lower branch (4) opposite to the sectioned element (5). ADVANTAGE - The device may be adapted to steps of different thickness and can be also fixed to the riser. |
