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

Friction gear is usually driven as [No. 1211].

b. By gripping the endless rope between grip wheels (see [1208]) the small wheel can be thrown into gear to grip the rope by a lever, cam or screw.

c. Differential gear may be driven from a shaft by belts or gearing. See [Sections 84] and [3].

d. Screw gear. Ditto.

e. Rack gear. Ditto.

f. Worm and wheel gear. Ditto.

g. Friction gear is usually driven as [No. 1211].

[1211]. Where the barrel shaft has a slight horizontal movement, so that, by the lever, it can be forced into gear with the friction pinion to raise the load, or into the brake block to sustain the load or lower it.

Grooved friction V gearing is also sometimes used. See [No. 667].