volute spring

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volute′ spring`

a coil spring, conical in shape, extending in the direction of the axis of the coil..
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Noun1.volute spring - a spring in the shape of a coilvolute spring - a spring in the shape of a coil  
spring - a metal elastic device that returns to its shape or position when pushed or pulled or pressed; "the spring was broken"
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Features also include textured nylon handles with a slot for wrist strap/storage plus wire notch and superior volute spring. Best suited to medium-sized hands.
It has two opposed volute springs that compress against each other.