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Constant force springs

Technical springs

Constant force springs are extension springs made from rolled up leaf spring strips. The constant torsion springs have a long spring travel without force increase. Thus the name constant force springs

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Constant force springs
Product measurements Open Legend
Rod Diameter (mm) Rod diameter (outside)
Axle size (mm) Axle size (inside)
Dm Mean coil diameter
Di Inside diameter
Lo Free length
Fn (N) Force in Newton
Sn Extension at Fn
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Constant force springs

Constant force springs are extension springs made of coiled leaf spring strips. The constant force springs have a long spring travel without force increase. TEVEMA produces constant force springs from a mould or in sufficient quantity, on demand.

Advantages of constant force springs

  • Smooth, even load over the entire length or displacement (deflection)
  • Strong power output within small spaces
  • Extended linear range
  • Small package size

Thanks to these advantages, constant force springs have versatile applications. When a constant load is required to compensate, raise, retract, or release, constant force springs can be applied.

Constant force spring applications

Constant force springs are used in more applications than you might think. Constant force springs can be found in the automotive industry for safety, interior and applications. Constant force springs can also be found in the construction of buildings in fall arrests, for window and door technologies, ventilation systems and much more. You can read all about applications of constant force springs here.