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Constant Force Springs from Lee Spring offer an excellent mechanism for applications where a constant load is required. Some of the many applications of constant force springs are in counterbalances, door closers, cable retractors, hose retrievers, tool head returns, cabinet and furniture components, gym equipment, hair dryers, toys, electric motors, appliances, space vehicles, and other long-motion functions.

Specifically, motor springs are used for cable retraction, power generation etc, while power springs are used for retracting applications such as seat belt webbing, tape measures and dog leads, seat recliner, window regulator mechanisms etc.

Lee Spring offers constant force springs in four Life Cycle ranges where each spring is a roll of high yield Type 301 Stainless Steel strip exerting a nearly constant restraining force to resist uncoiling. When the strip is extended, the inherent stress resists the loading force at a nearly constant rate.

Typically stainless steel Type 301 is selected, but high-carbon steel, Inconel and other materials are also suitable for constant force springs. Fatigue life of these springs ranges from 2,500 cycles to over a million cycles depending upon the load and size of the spring. Working deflections of 50 times the drum diameter can be achieved and these springs are often considered much easier to handle than a conventional wire spring.

Considerable flexibility is possible with constant force springs because the load capacity can be varied by using different mounting configurations such as cavity mounts, multiple spring mounts, etc. Constant force springs are available in a wide variety of sizes and end configurations to suit the design situation.

Many variations of constant force spring are possible over and above the simple increase in size, thickness, diameter etc. For example, doubling up by back-to-back mounting which not only doubles the available force but also increases stability; tandem mounting which doubles force and laminar mounting which doubles the force in a limited space.

Lee Spring

Britain’s No1 spring company…

…with over 16,000 different types of round wire compression, die, extension, torsion springs and disc springs. Our portfolio of products amounts to literally millions of springs – more stock, more choice and more product lines than any other spring supplier in the UK.

Britain’s No1 spring company…

…with over 16,000 different types of round wire compression, die, extension, torsion springs and disc springs. Our portfolio of products amounts to literally millions of springs – more stock, more choice and more product lines than any other spring supplier in the UK.

All are available for despatch on the day you order them.

Our spring ranges reflect the most commonly requested sizes but we also offer a range of specials including conical springs, swivel hook springs and drawbar springs. As always the range is supplemented by a custom spring design and manufacture service as well as selected spring kits.

Total Commitment to Quality

Our quality system is assessed by and registered with Bureau Veritas Quality International to the requirements of BS EN ISO 9001:2000 – certificate number 5692. This approval is the cornerstone of our service and commitment to total quality management.

Batch traceability is a standard procedure on all orders, regardless of quantity. Batch codes are fixed to all packages prior to despatch – the same coding appears on customers’ packing notes and our file records. Full traceability is achieved from raw material in-take to finished products. Certificates of Conformity are available.

Discounts

We are happy to offer discounts on large orders. It is also worth noting that you do not necessarily have to take your entire order in one delivery. You can total your requirements and place a scheduled order and still receive a price reduction.

Whether you are ordering one spring or thousands we welcome every enquiry and each order receives the same professional service.

Same Day Despatch

Order Today Despatch Today, that’s our service. Whatever your requirements for springs, from repairs to development, small prototype batches or production quantities, we can help you with your selection.

If you are a new customer we will open an account immediately. Credit Card facilities are available.

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