volute spring

American  

noun

1. a coil spring, conical in shape, extending in the direction of the axis of the coil.

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Etymology

Origin of volute spring

First recorded in 1860–65

Example Sentences

It is usual to drive balanced conveyors at or near the centre of their length, but they may also be driven from one end, 56 in which case the balancing of the conveyor would be effected by a powerful volute spring which is compressed and released by a crank and connecting rod, in place of being connected to one-half of the conveyor.

From Project Gutenberg

I claim a volute spring, formed or constructed of a coiled metallic bar, whose thickness is greater transversely upon one edge thereof than at any other point therein, substantially as and for the purpose herein set forth.

From Project Gutenberg