3M Constant Force Spring, Cfs 2 Cable Od 17 – 31.9Mm
PRODUCT FEATURES:
• A constant force spring (also referred to as power springs or constant torque springs) is a roll of pre-stressed strip that exerts a nearly constant restraining force to resist uncoiling.
• The force is constant because the change in the radius of curvature is constant.
• This is true if the change in coil diameter due to buildup is disregarded. Long extension capabilities, constant torque, and a virtual absence of intercoil friction have led many designers to specify constant force springs in such applications as brush springs for motors, counterbalance springs for window sashes, and carriage return springs for typewriters. Constant force springs are used to drive mechanisms for timers, movie cameras, and cable retractors. It is recommended to leave at least two wraps of the spring coiled at all times during use.
• The cycle life is approximately 2000 cycles.
