Step ladder for use by e.g. factory worker, has parallel front legs with lower tubes vertically slid in upper tubes, where upper tubes are connected by crosspiece, and lower tubes are connected by another crosspiece

摘要

The ladder has parallel front legs (1) composed of upper tubes (2) and lower tubes (3). The lower tubes are vertically slid in upper tubes. The upper tubes are connected by a crosspiece (4), and the lower tubes are connected by another crosspiece (5). Parallel rear legs (6) are connected by steps. A plate (9) is connected to the rear legs and to the upper tubes of the front legs through a pivot connection (7). Stops (8) i.e. small tubes, are placed on each side of the front legs.