Lesjöfors Springs America, Inc.. offers a wide assortment of both stainless and carbon steel flat springs for applications that range from small electronic and precision instrumentation springs to large industrial springs.
Constant Force Springs
Constant force springs achieve nearly constant retraction force by paying off material from a spool. Commonly used for displays and counterbalances. constant force springs are manufactured from flat strip material and spooled to a specific free diameter to give the needed pull force.
Constant Force Extension Springs are used in a wide variety of applications where a constant pull force is needed.
Applications for constant force springs include window balancers, counter balances, and point-of-purchase shelving and displays.
Constant Torque Springs
Constant torque springs can be used in timers, toys, appliances and to various cable/hose retraction products. Most commonly used for wind-up motors. Constant Torque springs generate a virtually flat torque curve over the range of output turns. When paired up with gearing mechanisms they produce a steady, consistent motor unit used in appliances and timers.Applications for constant torque springs include garden hose retraction, turntables, appliances, power generation, and toys.
Hair springs (clock spring or open spiral springs), can be used in a wide variety of applications where working turns are low and a linear increasing torque is needed. The torque output on a hair spring produces a linear torque profile because the spring coils don't normally come in contact with each other. Therefore, there will be no output torque loss due to friction. The material sizes used are similar to power springs, leading to varying product sizes from large counter balances and actuators to components of small medical devices and instrumentation.Applications for hair springs include valves, medical devices, actuators, instruments, and counter balances.
Power Springs are identified by the many coils of strip material stored in a case, barrel, or band, and connected to a central arbor or shaft. When this shaft is rotated, the material starts to wind flat against it. This action creates an increasing torque for as many turns as it can be wound until there is no material left.
Our capabilities range from 0.002 inch to 0.125 inch material thickness and from 0.030 inch to 3 inch material widths. Springs can be made using pre-stressed (back wound) or conventional (from flat) methods. Pre-stressed springs are spooled to a special free diameter and back wound into a housing or keeper, while conventional wound springs are manufactured and wound in the flat state.
The advantages of pre-stressed springs are that it allows maximized torque from a specific material. Conventional wound springs, however, offer increased Cycle Life.Applications for power springs include seatbelt retractors, tape measures, retractable dog leads, electrical cord retractors, hose reels, wind-up toys, pull start on small gas-powered engines, tool balancers, and valves.
Reels are self-contained spring units that are designed for ease of use and flexibility in any application. They allow for fast installation and are available with cables attached externally and with a variety of arbor configurations.
Designs are also available that completely enclose the spring with a lightweight durable outer shell. The spring assembly and cord/cable are contained internally.
Our capabilities also allow us to custom engineer a reel for your application to ensure the performance meets your specific requirements.Applications for reels include elevator door assists, counter balancers, product displays, and theft prevention (security devices).