Results of evaluation of efficiency of train dispatchers experimental model of chair “neutral condition”

This article presents the results of an evaluation of the effectiveness of an experimental model of a “neutral” seat for train dispatchers. An experimental model of the developed chair allows the dispatcher to move about 30-35% of its total weight to the front support points in the same body position in both seats. This experimental model of the chair indirectly confirms that the dispatcher’s body is close to the neutral position when the muscles are sitting with minimal movement, ie the weight of the body parts is transferred to the chair in the least tense position of the muscles and joints (through the kinematic chain). is achieved by the action of the supporting forces of the knee brace on the body parts. The design of the experimental model of the chair ensures that the design parameters and elements of the human body in the sitting position are in the “neutral position”, as well as the upper part of the body at the waist (payer) at an angle greater than 900feet. This eliminates the force moment caused by the weight of the upper back of the body when people sit in a normal chair, the knee pads of the chair and the spring-loaded stretches relieve the muscle tension needed to maintain the position of the legs.