Electric Controls on 6-ton Crane
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'THE Gardner 5.6-litre oil engine / which powers the new Walker 6-ton crane, drives a 32-kW generator to provide electrical energy for propulsion as well as for hoisting and slewing. Being electrically operated, there is no gearbox or clutch, the 36 b.b.p. traction motor being coupled .direct to the worm-driven axles of the rear bogie.
The twin wheels of the bogie are fitted with 40 by 8 tyres, the front wheels having 36 by 8 singles. Unladen, the crane can travel at about 10 and negotiate a gradient of about I in 15.
No outriggers are necessary to lift a 6-ton load at a maximum radius of 10 .ft., the hoisting speed being 30 ft. per minute. The crane has an unladen weight of approximately 19 tons. It is made by Walker Bros. (Wigan), Ltd., Wigan.
Signal lights and buzzers are fitted, at extra cost, to give the operator due warning when the crane is overloaded and to prevent overwinding.