points of the teeth coinciding, as found in the usual practice, these teeth are actually staggered in order that all the teeth on one side of a wheel are opposite the spaces between the tooth belonging IC) the spouse of the wheel. It is found that these gear wheels arc practically noiseless owing to the absence of back again lash. The clutches that control the locking of the tires giving different gear ratios are easily adjusted to have up use, 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 entire back axle shows the style which is perfect for commercial vehicles, and the differ ential gearing, which is of the bevel pinion type, is contained within the worm wheel.
The Power Plant Company also causes a speciality of a gear-box, the wheels where are always in mesh, and are locked by means of friction clutches. The gear wheels are all of the double helical type, and the slicing of this forms the main topic of a split patent. Instead of the central
The manufacturers claim that, by this specific system, only to per cent. of the power is dropped in friction. The usual practice is to cut the worms with a single thread, but, for reductions of speed between your worm and wheel of significantly less than 8 to at least one 1, multiple threads are employed. The complete unit is supplied in a dust and oil-retaining case, which has an inspection starting at its 
top part. In the standard design the worm is placed beneath the wheel, where it revolves in a bath of essential oil. The worm shafts are produced from mild steel, and so are afterwards hardened and floor true;
The ” Globoid ” Worm Gear.
The gear can be adapted to a number of purposes, such as for example driving machine tools, hoisting equipment, or in practically any case where a silent reduction of initial rate is desirable. The makers have turned their focus on the requirements of the motorbus and lorry builder, and are now ready to supply full hack axles for just about any type of vehicle which is powered by a cardan shaft. The worm wheel in this particular system has, rather than the usual cut teeth, revolving rollers which are continued hardened, and ground, metal pins fixed into the circumference of the warm steering wheel. The rollers, as could be observed in the illustration, are of conical form, and the worm is cut to fit these accurately. The components for the various parts are selected so that the metal used in the making of the rollers can be softer than either the pins, on which they revolve, or the worm. Consequently, if any use should take place after long use, it is an easy subject to replace the worn rollers. This characteristic is a significant one on the score of economy, because instead of the whole of the worm and wheel having to be replaced at a heavy cost, only the tiny parts have to be renewed.
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