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Understanding Constant Force Springs: Applications and Advantages

Constant force springs are unique in that they provide a consistent force over their length of travel, unlike traditional springs bound by Hooke's Law. This blog delves into their applications, particularly in extending earth continuity on armoured cables within cable joints, and highlights the benefits of using non-magnetic versions.

Non Magnetic Constant Force Springs used in electrical cable joints

What Are Constant Force Springs?

Constant force springs are designed to exert a consistent force throughout their range of motion. This is achieved through a pre-stressed strip of material, typically steel, coiled into a flat spiral. As the spring is extended, the material unwinds, but the force remains constant, making them ideal for applications requiring uniform tension.

How Are They Made?

Manufactured from materials such as stainless steel or carbon steel, constant force springs are precision-engineered to maintain their force over extensive cycles of use. The diameter and thickness of the material are crucial in determining the spring's lifecycle and force characteristics.

Applications of Constant Force Springs

Extending Earth Continuity on Armoured Cables

One of the key applications of constant force springs is in the electrical industry, particularly for extending earth continuity on armoured cables within cable joints. This ensures a continuous grounding path, preventing electrical faults and improving safety.

  • Installation Ease: Their design allows for easy installation within confined spaces.
  • Consistent Performance: The constant force ensures reliable contact pressure over time.

Other Uses

  • Medical Devices: Providing consistent force in retractable systems.
  • Automotive Industry: Used in mechanisms requiring precise tension, such as seat belt retractors.
  • Retail Displays: Employed in product pusher systems to keep items at the front of shelves.
Constant force spring applied to electrical grounding systems

Benefits of Non-Magnetic Constant Force Springs

Using non-magnetic constant force springs offers major advantages in environments sensitive to magnetic interference.

  • Magnetic Interference: Non-magnetic materials prevent disruptions in sensitive electronic equipment.
  • Corrosion Resistance: Stainless steel enhances resistance to corrosion and extends lifespan.
  • Medical Applications: Ideal for use in devices where magnetic fields could affect performance or patient safety.

Our Range of Non-Magnetic Constant Force Springs

At AC Cable Solutions, we provide a complete range of non-magnetic constant force springs for industrial and commercial use. Our products guarantee reliable performance, durability, and compliance with international safety standards.

AC Cable Solutions Part Number 3M Part No. Size Range Spring Width (W) Inner Diameter (D) Thickness Length of Roll
CFS P59 5 > 10mm 9mm 4.8mm 0.06mm 100mm
CFS0 P60 9 > 15mm 10mm 7.5mm 0.10mm 240mm
CFS1 P61 12 > 21mm 16mm 11mm 0.15mm 260mm
CFS2 P62 19 > 29mm 19mm 16mm 0.20mm 340mm
CFS3 P63 25 > 37mm 19mm 22mm 0.24mm 700mm
CFS4 P64 31 > 50mm 19mm 23mm 0.35mm 780mm
CFS5 P65 34 > 70mm 19mm 32mm 0.45mm 800mm
CFS6 P66 58 > 94mm 19mm 42mm 0.45mm 950mm
CFS7 P67 60 > 130mm 19mm 45mm 0.60mm 980mm

Purchase and Contact Information

We supply premium quality, UK-stocked constant force springs at competitive prices. Click below to order or reach out for bulk enquiries.

You can purchase our non-magnetic constant force springs online at AC Cable Solutions. For large volume orders, contact us on info@accablesolutions.com or call 0161 874 1480.