Crank, plate setter refers to a special kiln shelf that has usually three (3) legs and stacks by interlocking with others. Cranks are used to fire plates and tiles. Likewise, they are used to overcome poor use of space in kilns when flat objects are being fired.
See also:
"Crank" is in the HS Code "8483"
Transmission Shafts (Including Cam Shafts And Crank Shafts) And Cranks; Bearing Housings And Plain
Ref: 120583/2006-09-19
Alternative Spellings (Synonyms): Cranks, platers, plates