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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 torsion 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. Lee Torsion Stock Springs are offered in a choice of 90 degree, 180 degree, 270 degree and 360 degree free leg position 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. Lee Spring Stock Torsion Springs are offered with legs of equal length oriented at varying unloaded angles. Unit of Measure • Lee Spring's Stock Torsion Springs are specified in both English (Imperial) or metric units.Be sure to specify the preferred unit of measure when looking for a Stock Torsion Spring using Lee Spring's search engines.

Extension springs are designed to absorb and store energy as well as create a resistance to a pulling force. It is initial tension that determines how tightly together an extension spring is coiled. This initial tension can be manipulated to achieve the load requirements of your particular application. All Century extension springs are wound with an initial tension force which offers a small deflection load for secure installation "holding". The initial tension is equal to the minimum force required to separate adjacent coils. Each spring is of the constant diameter type with a variety of hook/loop styles

Tension springs in a wide range of variations : Tension springs are designed to give a specific pull force when extended to a a specific length. Our tension springs have a material dimensional range from 0.03 - 26 millimeter. Cold coiled extension springs can be given an initial tension which needs to be overcome before any elongation of the spring takes place. The level of initial tension can be controlled. Most common ends are different types of end loops and hooks, there are also a wide range of other mechanical attachment possibilities such as coiled in and screwed in attachments. Examples are, half hooks, German loops, English loops, extended hooks, side hooks, side loops, screw plugs and screw shackles. Unique competence in manufacturing tension springs Lessors have long experience of tension springs and constantly give priority to technological developments in the field. Our main competitive advantages are our wide product range, technology support, high quality and service of tension springs.

Extension springs are designed to absorb and store energy as well as create a resistance to a pulling force. It is initial tension that determines how tightly together an extension spring is coiled. This initial tension can be manipulated to achieve the load requirements of your particular application. All Century extension springs are wound with an initial tension force which offers a small deflection load for secure installation "holding". The initial tension is equal to the minimum force required to separate adjacent coils. Each spring is of the constant diameter type with a variety of hook/loop styles Tension springs in a wide range of variations : Tension springs are designed to give a specific pull force when extended to a a specific length. Our tension springs have a material dimensional range from 0.03 - 26 millimeter. Cold coiled extension springs can be given an initial tension which needs to be overcome before any elongation of the spring takes place. The level of initial tension can be controlled. Most common ends are different types of end loops and hooks, there are also a wide range of other mechanical attachment possibilities such as coiled in and screwed in attachments. Examples are, half hooks, German loops, English loops, extended hooks, side hooks, side loops, screw plugs and screw shackles. Unique competence in manufacturing tension springs Lesjöfors have long experience of tension springs and constantly give priority to technological developments in the field. Our main competitive advantages are our wide product range, technology support, high quality and service of tension springs.