York's no-tip tipper
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• York Trailer, in conjunction with its recently-acquired rigid tipping bodybuilder Neville Charrold, has produced a new tandem-axle tipping trailer which offers extra stability on 38-tonne aggregate operations when running with a threeaxle tractive unit.
Trailer stability has been approached in four key areas. Firstly, the chassis and 7.7m long 35m3 monocoque alloy body have been kept as short as possible, while body hinges have been set low in the York chassis to reduce tipping heights to a minimum.
Secondly, the overall body height of the trailer has been lowered by 100mm by cranking the chassis neck, which sits in twin recesses built into the body floor. The longitudinal runners, formed by the body recesses, also reinforce the neck area and eliminate floor rippling.
Thirdly, by spreading the effective spring centres at a maximum 1,225mm, roll stability is vastly improved, claims Neville Charrold.
Finally, the trailer has been fitted with 10-tonne capacity axles with specially-designed Tadchurch rubber suspension. According to York, the rubber suspension offers improved roll stability, and extra stiffness has been built into the suspension by fitting lateral spring assisters.
An additional torsion beam, designed by York, has been built into the chassis frame above the suspension, which provides a more rigid tipping base when unloading.
The first two high-stability trailers have entered service with Tarmac Roadstone (East Midlands). Tarmac's transport manager Peter Hall says the York/Neville Charrold trailers provide a 25.25 tonnes payload, compared with an average payload of around 24 tonnes on a normal 38-tonne artic tipper.
When compared with an eight wheel tipper, carrying a 20-tonne payload, the new York/Neville Charrold trailer, weighed by Tarmac at 4.87 tonnes, gives a 5.25-tonne payload bonus. Productivity is also boosted by 25%