Constant Force Spring range from Lee Spring
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 offer 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.
Further information on Constant Force Springs from Lee Spring can be found at www.leespring.com/int_learn_constant_force_springs.asp, or follow them on twitter - https://twitter.com/leespringuk.
Lee Spring is the UK supplier of choice for catalogued and custom springs, including compression springs, torsion springs, constant force springs, die springs, belleville spring washers, wave springs, extension springs, battery springs and numerous speciality springs. Materials include steel, stainless steel, cobalt/nickel alloy, bronze, brass, music wire and composite plastics.
In addition, Lee Spring offer extensive custom design and manufacture services for one-off/prototypes or ongoing production requirements.
Lee Spring Ltd
Tel: 0118 978 1800
Press contact: Christopher Petts
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