Prestressed Powder Springs are wound around the arbor in reverse direction and assemble it in a housing or keeper, it is "S" shaped when in the free state, the ends configurations can be formed a connection hook or bend, or it can be pierced or notched a hole. As spring thickness and length increases and spring space relatively increase.

This unique configuration yields a compact power source that allows the spring torque increase throughout the number of useful turns and cause a higher working stress while resulting a flatter torque gradient.

In comparison with a conventional power spring, a prestressed power spring can have a greater energy storage capacity up to 25% to 55% with the same torque and deflection, which is suitable for use in applications where winding, counterbalancing and retrieving are required.

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