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Two out of three cars produced worldwide are fitted with parts produced in KERN-LIEBERS group. Over 90% of the cars produced in India are fitted with our parts.
Constant force springs
Constant force springs are used in many industries as a resetting element that provides a uniform force.
Constant force springs are characterized by a very uniform force-displacement curve. This curve can be adjusted within defined limits to the specific application. The machinery for production is developed and manufactured internally by KERN-LIEBERS.
Spring width: 1.8 - 100 mm
Spring thickness: 0.05 – 1.00mm
Material: Textured carbon and stainless steels
Service life: Up to 50,000 load cycles (typical applications require 5,000 – 20,000 cycles)
Typical applications of constant force springs for tension and compression forces include:
We manufacture these springs with cut and deburred edges or rounded edges. Multiple constant force springs are used in a range of different applications: as pressure springs for carbon brushes in electric motors, as safety switches for low-voltage applications, and as respirator valves for patients in hospitals. They provide indispensable services in many areas. The springs are available in natural temper colors (yellow, brown) and as bare metal hardened in protective glass.
Spring width: 1.5 – 10.0 mm
Spring thickness: 0.03 – 0.15 mm
Material: Stainless "Superflex®" spring steel strip
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: