Traction spring Constant force

flatstainless steelcarbon steel

Constant force springs in a biaxial arrangement – work roll and storage roll – are used as a generator of constant torque. In retractors, the special torque characteristics assure uniformity across many winding rotations. Cable retractors for electrical appliances and constant force spring drives also take advantage of the fact that the characteristic curve of the spring can be adjusted to the specific needs of an application. This can be defined as: POGRA – rising (POsitive GRAdient) MIGRA – flat (MInimum GRAdient) NEGRA – falling (NEgative GRAdient) Spring width: 1.8 - 50 mm Spring thickness: 0,05 - 1,0 mm Material: Textured carbon and stainless steels Service life: Up to 50,000 load cycles (typical applications require 5,000 – 15,000 cycles) Up to 100 working rotations Small to medium torque range, minimum hysteresis, biaxial system with work roll and storage roll Typical applications of constant force springs as a torque generator include: Cable retractors