Torsion spring for gate and door, has rectangular spring wire cross section, profiled spring wire cross section excluding round cross-sectional shape, and flattened spring wire cross section provided with two facing sides

摘要

The spring (1) has a rectangular spring wire cross section, and a profiled spring wire cross section excluding a round cross-sectional shape. A flattened spring wire cross section is provided with two facing sides, which are enclosed at ends by roundnesses. The spring exhibits a small strained spring length with smaller diameter. The spring is fixed at an end by a spring holder (4) and at other end by a spring compressor (3), where the spring is connected to a rope drum (5). The rope drum is provided on a winding shaft (2).