Negative values are below top.
This method of lifting containers incorporates transverse mounted hydraulic arms integral with a lorry chassis. It uses a pair of two legged slings each being attached to the hook of the lifting arms, whilst the bottom ends are attached to suitable lifting lugs, these should remain insitu if ever the slings become slack. This attribute is what makes the Preston Shoe ideally suitable for use with these machines.
The sling geometry for single point end lifting is effective over a sling angle range between 68° and 72° typically 70°.
The sling arrangement determines the head room and normally they do not make contact with the end faces of container but lifting point may be below the roof of high cube units and with some machines, may make contact with the top end face of container.