The cross section of the ladder beam of the miter ladder is 3 * 8cm, the cross section of the pedal is 4 * 4.5cm, and the pedal spacing is between 27.5 and 30 cm. The distance between the bottom pedal and the top is 27.5cm; The total length of the ladder is not more than 5 cm, and the width is not less than 30 cm. The included angle between the ladder and the pedal shall not exceed 87 degrees.

There needs to be a tenon connection between the pedal and the ladder beam, and the tenon and the beam surface of the inclined ladder are on the same horizontal plane. Pay attention to whether they are tightly connected, otherwise cracks will lead to trouble in use. It is necessary to design a stay or safety rope at the bent part to make the ladder more firm and reliable. If you use rope, don't use ductile materials such as iron wire, hemp rope and nylon rope.

Matters needing attention in the use of herringbone ladder

1. Before using the ladder, be sure to check whether the feet, rungs and connecting rods are safe and whether the anti-skid pads are in good condition.

2, it is forbidden to put the ladder on the ground uneven, there is water, oil and other places to use.

3. When using a ladder, it is forbidden for two people to step on the ladder platform at the same time. When moving the ladder, be careful not to touch the goods and fire pipes on the ladder to avoid personal injury.

The above contents refer to Baidu Encyclopedia-Ladder.