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Simple conversion from coil to flat
Page 31
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• Trust form sections that are readily adjustable to accommodate steel coils or circular components of varying diameter and can be lowered to provide a flat platform for return runs are features of a new multi-purpose-load support system jointly evolved by Winn International Containers Ltd and the maker Reynolds Boughton Ltd of Amersham with the help and advice of the British Steel Corporation and the Freightliner Company.
The system was developed to provide safety in transit of coils or the • equivalent by providing full support for loads of any diameter with the twist of a crank handle; it can be mounted on an ISO container on a platform equipped with twist locks or built in to a vehicle chassis. The danger of damage to coils is virtually eliminated. Loading is simplified and the system would enable packaging to be dispensed with or simplified on short-sea or deep-sea deliveries.
Fully tested in application to road and rail vehicles, the "insert” type is based on a flat bed that is slid onto the floor of an ISO 20ft container with the help of a fork-lift truck and has four adjustable hinged panel or traps that are operated by screw gear from the end of the bed.
Incorporated in an ISO platform the second type also has four traps, but in this case the screw gear is operated from the side. Each trap can be employed to support a single load or a long load may spread across two or more traps. Coils can be safely carried with a diameter up to 30f1 10in, which covers about 93 per cent of the coils produced. The limiting factor is the centre of gravity of the vehicle; for coils of larger diameter the use of a drop-frame low-loader is required.
For loading, the traps are opened out, the coil is placed on the floor between the two sections and the traps are then moved upwards and inwards until the load is centralized and the weight, is distributed between the traps and the floor. Eliminating the need for chocks saves time and obviates a common cause of insecurity. An insert weighs not more than 1 ton 8cwt; the payload of an ISO 20ft container carrying an insert is about 13 tons. If the system were ' built into the chassis the weight increase would be minimal. An eight-wheel rigid equipped with the system will be available for demonstration within three weeks.
Each screw mechanism comprises a rod, a bevel box and a pair of threaded bars. The bars are threaded to a floating nut on a cross-beam to which the elevating arm of the traps are hinged. A sliding shoe with a Ferodo pad on each side of the cross-beam gives support to the load. Traps have been tested with individual loads up to 27 tons. The coils are secured with flat straps which do not damage the load.
It is emphasized by the two companies that the availability of the system will enable rigid vehicles safely to be employed for coil carrying for the first time. To prevent disintegration of a conventional platform by the forces created by coil load in transit, it is normally essential to secure the coil or base frame with chains pressing under the vehicle chassis. But this is impossible with a rigid vehicle because of the propeller shaft.