points of the teeth coinciding, as in the most common practice, these teeth are staggered so that all the teeth using one side of a wheel are reverse the spaces between the tooth belonging IC) the spouse of the steering wheel. It is found that these gear tires arc practically noiseless due to the absence of again lash. The clutches that control the locking of the wheels giving the different gear ratios are easily adjusted to have up dress in, without dismantling the gear-box.

they run in bushes of phosphor-bronze, and ball-bearings are interposed between the ends of the worm and the bushes. The illustration of the complete back axle displays the design which is made for commercial vehicles, and the differ ential gearing, which can be of the bevel pinion type, is contained within the worm wheel.

The Power Plant Company also produces a speciality of a gear-box, the wheels where are always in mesh, and so are locked by way of friction clutches. The apparatus wheels are of the double helical type, and the reducing of this forms the subject of a individual patent. Instead of the central

The manufacturers declare that, by this particular system, only to per cent. of the power is shed in friction. The usual practice is to slice the worms with a single thread, but, for reductions of speed between the worm and steering wheel of less than 8 to 1 1, multiple threads are employed. The complete unit comes in a dust and oil-retaining case, which has an inspection starting at its top part. In the typical style the worm is located beneath the steering wheel, where it revolves in a bath of essential oil. The worm shafts are made from mild steel, and are afterwards hardened and floor true;

The ” Globoid ” Worm Gear.
The gear could be adapted to a number of purposes, such as driving equipment tools, hoisting gear, or in practically any circumstance where a silent reduction of initial rate is desirable. The makers contain turned their focus on certain requirements of the motorbus and lorry builder, and are now prepared to supply total hack axles for any type of car which is driven by a cardan shaft. The worm steering wheel in this particular system has, rather than the usual cut teeth, revolving rollers which happen to be carried on hardened, and ground, steel pins fixed into the circumference of the warm steering wheel. The rollers, as may be observed in the illustration, will be of conical form, and the worm is minimize to fit these accurately. The elements for the various parts are selected in such a way that the metal found in the producing of the rollers is definitely softer than either the pins, on which they revolve, or the worm. Consequently, if any dress in should take place after long work with, it is an easy matter to replace the donned rollers. This feature is an important one on the score of economy, because rather than the whole of the worm and wheel having to be replaced at much cost, only the tiny parts must be renewed.

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