A BRAKING RETARDATION APPARATUS FOR DOORS, WINDOWS OR THE LIKE

摘要

On the wall of the cylinder (1) a grease (13) with high viscosity is applied. The wall of the cylinder is provided with ring-shaped or spirally formed rings or grooves. The cylinder wall has an uneven surface. The peripheral surface of the piston is provided with ring - or spirally-shaped rings or other uneven formations. The piston connecting rod (3) penetrates a hole in the face wall of the cylinder. Between the base of the cylinder and the piston is tensioned a pressure spring.