treadles

n.

（尤指旧时驱动机器的）踏板( treadle的名词复数 )；

1. She was working the treadle of her sewing-machine.
   她正用脚踩动缝纫机的踏板。

Aerobic exercise apparatus with pivoting foot treadles and handlebar
Positive behavioral contrast when pigeons press treadles during multiple schedules
Exercise device with treadles
Foot treadles
Simple and multiple schedule responding and behavioral contrast when pigeons press treadles
Exercise device with treadles
Measurement of oxygen consumption of indoor walking with a double treadles treadmill vs traditional treadmill
A Talk on Application of Piano's Treadles
TREADLES PORTABLES from ELECTRICS from $69
Stair climbing exercise apparatus with improved bellows