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"itrengthened light veight Merriworths

17th March 1972, Page 39
17th March 1972
Page 39
Page 39, 17th March 1972 — "itrengthened light veight Merriworths
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Special features of an improved range

all-welded semi-trailers, announced by erriworth (Engineering) Ltd, include ass-member flitch plates of novel shape, a x-section-backed coupling plate and .ectly attached suspension units, which ;rease the strength of the structure and wide a weight saving of about 2cwt. The age covers gcw ratings of 24 tons to 38 as.

As a means of spreading the stresses ross the full depth of the I-beam chassis =hers, the majority of the tubular ass-members are welded to the enlarged ntre sections of profiled I-plates, located tween the flanges, that have been named ii plates after the Greek capital letter Phi. gh-penetration CO, welding is used .oughout.

A modified form of reinforcing plate is ed in the cross-member areas over each ring bracket that comprises a wedge-section tbot. The spring brackets are now directly welded to the bottom flanges of the chassis frame members. On earlier models the suspension was mounted on a sub-frame.

The rubbing plate carrying the coupling kingpin has been reinforced by deep cross-pieces of pressed-steel channel section. Welded to the back of the rubbing plate these channels form a criss-cross of box-section members. Floor-support Isection cross-hearers are attached to these reinforcing members to provide extra strength.

Skeletal semi trailers designed to carry ISO containers are equipped with twistlock bolsters of 1-beam section with thick flanges claimed to have double the bending strength of the square-tube members that were previously employed, and to spread the stresses over a much wider area of the chassis frames.