A Three-point Harness, Also Known As A Half-body Harness

A three-point harness, also known as a half-body harness, refers to a type of harness that only fastens the upper body, and has 3 contact points (or contact parts) with the human body, that is, a tie that is in contact with the waist and two shoulders. Its advantages are lightweight, easy to wear, good mobility, cheap price, high practicality, the disadvantage is low safety, only single hook, no cushioning device.
The three-point harness is not suitable for high-altitude work for fall suspension, and once it falls, it is easy to cause impact and damage to human bones. Its scope of application is fencing operations and area restrictions, and clearly stipulates that it cannot be used for operations where suspension has a high risk of falling.
Security hazards
First, although the basic style of the three-point harness is to add two shoulder straps to the waistband, this style is too simple, and when a fall occurs, especially when the user's head falls downward, the shoulder straps may be separated to the left and right, causing the user to detach from the belt. In order to prevent this, the three-point harness that is currently common on the market also adds a chest belt between the two shoulder straps to bind it. Since there is no leg strap, it is determined that during the fall suspension, the three-point harness will move along the upper body of the human body, and the chest belt may strangle the user's neck. If this occurs during a fall, the chest belt may strangle the worker's neck because the impact of the fall has not been fully absorbed by the seat belt. If this occurs when the user is suspended in the air after the fall suspension ends, they may suffocate and will not be able to hold out until the moment of rescue.
Second, the waistband of the three-point harness tightens and compresses the user's abdominal area during the fall suspension, which is also very dangerous. The abdomen of the human body has many internal organs, and if the impact of the fall of 6 kN is concentrated in the abdominal area, it will undoubtedly lead to internal organ damage. Later, after the fall suspension is completed, the user will hang in the air for a period of time to wait for rescue, at this time the seat belt needs to bear the weight of the user, through the conduction of the belt, this force will continue to compress the user's abdomen until rescued. If the abdomen is compressed for a long time, the internal organs will continue to be injured, which will aggravate the degree of injury to the user.