| 摘要 |
The improved extension ladder is of those of the manual, mechanical, leaning or convertible type, which can also be used in a swing-back arrangement, which comprises two or three sections, the active section, that is, that on which the feet of the user are located, being such that the profiles of the steps are rotated through an angle ±° with respect to the perpendicular to the plane defined by the stiles (14, 14') of the ladder, also having an additional profile (11) integral with the narrow step (12) itself which converts it into a wide or wider step (13), with a tread for the shoe of the user sufficient for the latter to feel safe working at height. Said additional profile (11) consists of a ribbed surface (1), to prevent accidental slipping of the foot of the user, with two perpendicular flanges (2 and 2') forming a space into which this narrow step (12) fits.
|
