释义 |
Wagon jack Wagon jackA Jack intended for raising a wagon axle two or three inches so that a wheel could be removed or partially pulled off for greasing. When a light farm wagon was empty, greasing was generally done by manually lifting one corner of the wagon, sliding the wheel partially off the iron skein, and putting grease only on the exposed section. Later, after the wheel was reinstalled and began rotating, the grease would work its way over the whole wheel bearing. |