Sell power spring

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The spring can be used as constant force spring, spring for motor brush, vacuum spring, tape measuring spring, spring for balance, start-up spring, spring for pulling dogs, hose and cable reel spring, power spring , spring for fan and washing maching timer etc.
The constant force spring can be used to counterbalance items, such as windows (known in the window industry as coil balance springs) , doors, display racks and trays. It can also be used as a return or retracting mechanism wherein the constant force spring will provide a smooth, even, uniform load through its entire length or travel (deflection) . Travel (extension, deflection) is limited only by the length of material in the spring. Load is a function of material width, thickness and coil diameter. Increased loads can be obtained by using two or more constant force springs interwound or in tandem or in other configurations