(57) The invention relates particularly to roller crushers, in which there is a need to
positively locate crusher members such as teeth on the contra-rotating rolls. Hitherto,
teeth have been formed on an annular disc, and the disc secured to a roll body or
shaft by welding or by pouring concrete down aligned lobes on the discs. Such constructions
are effective in locating the teeth against movement relative to the roll body or
shaft but make extremely difficult the task of removing the teeth when worn or damaged
to an extent requiring their replacement. The object of the invention is to avoid
such difficulties, which objective is met by a construction of roll comprising a body
portion in the periphery of which are formed a number of parallel longitudinal grooves
(6), a number of tooth bearing members (8, 12) each having a surface to fit closely
the periphery or part of the periphery of the body, and each having at least one projection
(7) from that surface of a shape adapted to fit the shape of a groove, and abutment
means (9, 10) at each end of the body, whereby the tooth bearing members are a sliding
fit on the body and are located in their operative position by the abutment means,
the engagement of the projections in the grooves and the abutting side-by-side relationship
of adjacent tooth bearing members.
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