using expansible or retractable mould or core elements

Introduced: September 1968

Last revised: January 2006

Full Title

Methods or machines specially adapted for the production of tubular articles > by casting into moulds > using compacting means > using expansible or retractable mould or core elements

Classification Context

Section:: PERFORMING OPERATIONS; TRANSPORTING
Class:: WORKING CEMENT, CLAY, OR STONE
Subclass:: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER

1 direct subcode

Child Classifications

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B28B 21/2 using inflatable cores, e.g. having a frame inside the inflatable part of the core