Swivel
In foundry nomenclature swivels mean the trunnions of a flask. Properly speaking, a swivel consists of a link made to turn round on a headed pin. See FLASKS; CHAIN.
Swivel-chain is a chain supplied with a swivel-link to permit an even disposal of the links, free from twisting or kinks. This may be accomplished in a superior manner by inserting a long flat link, which, besides working loose on a link-pin at one end, is also tapped at the other end to receive a long threaded link-pin, by which means several chains may be readily adjusted to any required variety of lengths, and thus effectually dispense with the dangerous method of twisting the chains, so prevalent in some foundries. A chain made in this manner is commonly termed a buckle chain by foundrymen. See CHAIN; SWIVEL.