The installation height of the doorknob is generally between 80-100cm, which refers to the door, and the doorknob is generally 110cm from the ground, of course, the height of some anti-theft doorknobs may be 113cm, but this is only an approximate height, the height of each family member is different, and the door opening habits are also different, so the specific height of the doorknob should be set or should be specifically considered.
The size of the shoe should also be included in the design of the doorknob height of the doorknob installation, and the average value of the additional height of the shoes of men and women is also different, which should be carefully considered.
Generally speaking, the installation of the doorknob should be the most comfortable when the forearm is horizontal, because at this time, the forearm and wrist joint are only subjected to tension, and there is no additional force of bending and torsion, which is the most economical from a mechanical point of view, that is to say, the appropriate height of the doorknob should be the height of the elbow joint.
Because the door is not tailored to a person, the principle of determining this height is to make as many people as comfortable as possible, then it depends on the distribution density of the height size of the elbow joint, and the highest distribution density should be selected. Generally, the 50th percentile is fine, because the size of the human body is roughly normally distributed. (Note that if it is a door frame design, the maximum percentile should be selected, because the door frame only has a minimum limit, not an optimal value)
If the doorknob is designed as a door in China, to find the percentile size of all Chinese people, men and women should consider it comprehensively. If it is for family use, it is much simpler, as long as the height of the family members is considered, if the family members are generally higher, it is recommended that the height of the doorknob should be higher than 110cm.
