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pitch chain
Word History and Origins
Origin of pitch chain1
Example Sentences
Sometimes, especially in the case of overhead travelling cranes for very heavy loads, the chain is a special pitch chain, formed of flat links pinned together, and the barrel is reduced to a wheel provided with teeth, or “sprockets,” which engage in the links.
Every second link of the 12 in. pitch chain carries a push or scraper-plate, as shown in illustration.
A superior plan is now adopted, in which the messenger, consisting of a pitch chain which has a double and single link alternately, works in iron spurs fastened above the lower rim of the capstan.
The latter is turned to coil on the band by a pitch chain from the builder screw, the motion being given through a friction clutch, to allow for slip as the bobbin or coil gets larger, for obviously the bobbin as it gets larger is not required to turn so fast to coil up the band produced as when it is smaller.
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