Lee Spring is adding wave springs and constant-force springs to its product portfolio in January 2008. This move increases the stock spring range to over 15,500 different types of spring. Custom designs are also being offered. The new springs will be launched in the UK on stand K2 at the Southern Manufacturing Exhibition on 6-7 February 2008 at FIVE, Farnborough.
Wave springs perform a similar function to compression springs but they require approximately 50 per cent less compressed height space due their sine wave design that gives tangential contact. These springs also offer greater control of axial movement and consistent load transfer.
Produced in stainless steel type 17-7 PH, Lee Spring's wave springs offer optimum performance in static or slightly dynamic applications where space is critical or where radial and axial tolerances are tight.
Stock sizes range from rod sizes of 6.35-25.40mm (0.250-1.0inch) to suit hole diameters from 9.53-31.75mm (0.375-1.250inch) and in spring rates from 0.81-5.33kg/mm (45-298lb/inch).
Manufactured from high-yield 301 stainless steel strip, Lee Spring's constant-force springs exert a near-constant restraining force to resist uncoiling. This natural inbuilt stress resists load at an even rate and makes the springs suitable for use in retractor mechanisms. Common applications include counterbalance springs, car seat belts and cable retractors.
Constant-force springs are usually tightly coiled on a drum and either the free end or the drum can be attached to the load.
Four life cycle ranges are offered: 2500, 4000, 13,000 and 25,000, covering loads from 0.30-7.48kg (0.66-16.50lb). Lengths vary from 356-1524mm (14-60inches); thicknesses from 0.10-0.51mm (0.004-0.020inch) and widths from 6.35-31.75mm (0.250-1.250inch).