A 'treadle' [from OE ''tredan'' = to tread] is a part of a machine which is operated by the foot to produce reciprocating or rotary motion in a machine such as a weaving loom (reciprocating) or grinder (rotary). Treadles can also be used to power water
pumps (
treadle pump)
Railways
On a railway, a treadle is a device that detects the passing of a train, a bit like a
track circuit and might be used to put a
signal to 'stop'.
Sewing machines
Many of the early sewing machines were operated by a treadle mechanism linked to the machine by a leather belt.
See also
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Treadle (railway)