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Mobile hydraulic lifting legs
Page 47
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A HYDRAULICALLY operated system has been developed by W. E. and F. Dobson Ltd., Colwick, Nottingham, for use in the handling of ISO containers or custom-built bodies fitted with suitable bottom corner castings. It comprises four trolley-mounted hydraulic legs each embodying a suitable corner casting with a lock mechanism, quick-release hose couplings and a corner-braced fitting to give additional stability.
The hydraulic legs are positioned at each corner of the container and the hoses from the portable power unit connected to each leg. The power unit is actuated, raising the legs to the required height. The legs are then locked on to the corners of the container and the container raised clear of the chassis or trailer.
Suitable for lifting from both conventional platform and skeletal trailers, the equipment incorporates a deadman's handle control valve to ensure that all hydraulic circuits are locked should the operator release the controls with the power unit running. Pressure is automatically retained in a leg should the flexible hose be inadvertently damaged.
Maximum designed lifting load is 20 tons per set of four legs.