The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

Section 84.—TOOTHED GEARING.

[1515]. Spur gearing. For construction of teeth see text books.

[1516]. Strongest form of spur teeth for motion in one direction only.

[1517]. Half shrouded spur teeth.

[1518]. Whole shrouded spur teeth.

[1519]. Double helical spur teeth, stronger by 15 per cent. than straight teeth; work without backlash or noise, and may be half or whole shrouded; section of tooth on plane of motion is the same as the ordinary spur teeth ([No. 1515]).

[1520]. Crown wheel and pinion.

[1521]. Long teeth spur wheels or “star” wheels. Used on roller mangles, &c., where the centres rise and fall.

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