Custom Torsion Springs

Look to Lee Spring's Custom Edge for World-Class Custom Spring Manufacturing

Lee Spring is recognized for global leadership in the manufacture of both Stock Springs and Custom Springs. In addition to our vast manufacturing capabilities, we have a large staff of experienced engineers to assist you. Our expert engineers can work from your drawings, specifications or part samples. We offer Concurrent Engineering support, assisting you in developing your initial designs and continuing to support your product throughout the design and manufacturing process.

Custom Torsion Spring Capabilities

Lee Spring manufactures Custom Torsion Springs in wire diameter .005" to .375", in a variety of configurations, including single and double torsion. Torsion springs are specified to work over a mandrel (Definition: A metal bar around which other metal may be bent.) They are wound left hand or right hand as required to withstand the applied loads. Ends (or legs) can be designed to specifications, including but not limited to straight offset ends, short hook ends, hinge ends, straight torsion ends, special ends as well as combinations of these.

Lee Spring manufactures Custom Torsion Springs in a wide range of materialsincluding:

• Music Wire
• Stainless Steel 17-7, 302 and 316
• Phosphor Bronze
• Hastelloy ®
• Inconel 600, 718 and x750
• Beryllium Copper
• Elgiloy and many others

Lee Spring performs virtually every special process in-house to assure comprehensive quality control and maximum efficiency, including:

• Plating
• Passivation
• Powder Coating
• Grinding
• Heat-Treating
• Polishing
• Assembly

Not sure what you need? Not sure if it can be made? CALL LEE SPRING FIRST! A Lee Spring engineer evaluates every custom design submitted to us, as our overall capabilities are flexible and continuously expanding. Lee Spring's State of the Art Manufacturing Equipment combines with Lean Manufacturing Techniques to produce the exact springs and metal parts you need, when you need them.

When it comes to designing and producing custom torsion springs or any type of custom springs, Lee Spring is your first choice. You can depend on Lee Spring for:

• Rapid Quotation Response
• Quick Turn-Around on Short Runs
• RoHS Compliance
• Global Distribution
• ISO 9001:2000 Certification.

Whether your requirements call for a special spring, washer, stamping or wireform, only Lee Spring gives you the leading edge you need in today's global environment.

ABOUT TORSION SPRINGS TORSION SPRINGS are helical springs that exert a torque or rotary force. The ends of torsion springs are attached to other components, and when those components rotate around the center of the spring, the spring tries to push them back to their original position. Although the name implies otherwise, torsion springs are subjected to bending stress rather than torsional stress. They can store and release angular energy or statically hold a mechanism in place by deflecting the legs about the body centerline axis.This type of spring is normally close wound but can have pitch to reduce friction between the coils. They offer resistance to twist or rotationally applied force. Depending on the application, torsion springs can be designed to work in a clockwise or counter-clockwise rotation, thus determining the direction of the wind.

Applications Common torsion springs are used in clothes pins, clipboards, swing-down tailgates and garage doors,. Torsion springs are used for hinges, counterbalances and lever return applications. Sizes range from miniature, used in electronic devices, to large torsion springs used in chair control units. Load should be applied in the direction of wind; unwinding from the free position is not recommended. As they wind up, torsion springs reduce in diameter and their body length becomes longer. This should be considered when design space is limited. Torsion Springs perform best when supported by a rod or tube. The designer should consider the effects of friction and arm deflection on the torque.

Configurations Torsion springs are designed and wound to be actuated rotationally, and to provide an angular return force. There are many options for leg configuration so the spring can be attached in different ways. Leg specifications to consider for torsion springs include leg angle, equal leg length, and leg end style. Springs that are straight or parallel on the same side are considered to have a 0º leg angle the increasing angle is in the unwinding direction. Leg end style choices include straight torsion, straight offset, hinged, short hook ends, and hook ends. Torsion spring ends can be bent, twisted, hooked or looped to suit your project needs.The double torsion spring consists of one set of coils coiled right hand and one set of coils coiled left hand. These coils are connected, usually with an unwound section between the winds and work in parallel. The sections are designed separately with the total torque being the sum of the two.

Parameters Dimensions: Inner Diameter, Outer Diameter, Wire Diameter, and Spring Length.

• The Inner Diameter is specified when the spring is required to slip over a mandrel with sufficient clearance to operate freely.
• The Outer Diameter is specified when the spring is required to fit into a circular hole with sufficient exterior clearance to operate freely, or if there are outer housing clearance issues.
• The Spring Length is the length of the spring coil.Performance factors Spring Rate, Maximum Deflection, Maximum Load and Wind Specifications.
• Spring Rate is the angular return torque provided per unit of angular displacement.
• Maximum Deflection is the maximum rated angular deflection of spring before damage.
• The Wind of the torsion spring can be right hand, left hand, or double torsion.