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Breakdown crane
Page 157
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A heavy-duty power-operated hydraulic breakdown crane with a safe working capacity of 12 tons that is suitable for dealing with vehicles of much greater tonnage dependent upon weight distribution has been announced by Harvey Frost and Co.
Known as the H. F. Atlas 12, the crane is fitted with two large diameter hydraulic rams to provide effortless lifting, while extension and retraction of the 4ft telescopic roller-mounted jib is by means of a double-acting hydraulic ram operating in conjunction with an hydraulic lock valve which positively hold the selected position. The jib is calibrated in 1-ton increments.
All movements of the crane are controlled by two hand levers, the speed of lowering being maintained at a constant level through the medium of a pre-set, flow-control valve. Automatic fail-safe valves are built into the hydraulic circuit to ensure that the jib cannot fall in the unlikely event of an oil-line failure.
The end of the jib has two lifting eyes, the main eye carrying the lifting chain and saddle; the outer eye is available for use with a secondary lifting chain or sheave block. During transportation of the load, the jib rests on a special support pin which transfers the weight to the jib frame thus taking the load off the hydraulic system.
Standard ecuipment includes a three-way swivelling lift and a tow sling suspended from a 12-ton high-tensile steel chain. Attached to the crane base is a sturdy anti-sway bar which is connected to the lifting saddle and affords positive control over the towed vehicle. The crane incorporates a 12gal oil reservoir with filtered inlet and outlet.
Optional extras include an 8ft long 7-ton capacity chain with shackles: a shorteninn clutch or a universal swivelling rope sheave block can be used in the secondary-eye position on the jib. Rear support jack legs and sprags are also available.
Made by: Harvey Frost and Co Ltd, Dunrnow Road, Bishop's Stortford, Herts.