The worm gear (Fig. 34) is a special case of screw and nut, where the latter is replaced by a toothed wheel called a worm wheel.
A worm gear is one in which one of the members is in the form of a screw.
And by means of a worm gear, operated by a wheel near the steering apparatus, the light could be deflected in any direction.
The rod is attached to the gage with a worm gear and is operated by a small hand wheel at the front of the table.
The worm gear Shaft is driven by a sprocket chain in the bead end.
The two knobs with drum are mounted on an axle a, which in its central portion is enlarged and provided with a worm gear.
Of these the best known are the block and tackle, the endless screw (worm gear), and the water snail, or Archimedean screw.
A spiral spring pressing against one of the journals into which the axle is mounted prevents any lost motion in the worm gear.
A motor started turning, and the worm gear on the motor opened a valve on the boiler.
In electric cranes the motor is connected to the barrel, either in a similar manner by spur gear or by worm gear.