| 摘要 |
<p>The footstep has a platform (A), gliders and screws, where the platform has a platform body (1) with an opening and side openings for screws (4) such as boundary poles. The platform leans against a frame of a ladder with the body lower side. The gliders have a body that is drawn into the opening, and a gripping jaw with openings and a passage, where a side rail runs through the passage. The screws reside in the opening in the gripping jaw. The screw has a head and a plate for tightening the glider at the side rail by rotation of the head.</p> |
