A treadle (from Old English: tredan, "to tread") is a mechanism operated with a pedal for converting reciprocating motion into rotating motion. Along with cranks, treadmills, and treadwheels, treadles allow human and animal machine power in the absence of electricity.

A table fitted with a sewing treadle

Before the widespread availability of electric power, treadles were widely used to power a range of machines. They may still be used as a matter of preference or in environments where electric power is not available.

Operation and usesEdit

A tailor in Chad with a treadle sewing machine

A treadle is operated by pressing down on its pedal with one or both feet, causing a rocking motion. This movement can then be stored as rotational motion via a crankshaft driving a flywheel. Alternatively, energy can be stored in a spring as in the pole lathe.

A homemade treadle pump in use in Bangladesh

Treadles were once used extensively to power most machines including lathes, rotating or reciprocating saws, spinning wheels, looms, and sewing machines. The last use was popularized by Elias Howe and Isaac Singer in the eponymous Singer sewing machines. Today the use of treadle-powered machines is mostly relegated to hobbyists and historical re-enactors, as well as in areas of the developing world where other forms of power remain unavailable.

Dictation using a treadle-powered cylinder phonograph, circa 1897

See alsoEdit