A New 3-ton Mobile Crane
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ANEW mobile crane, Type .KL33, has been added to the range produced by K. and L. Stcelfounders and Engineers, Ltd., Letchworth. It can lift 3 tons at 7-ft. 6-in, radius,or 2 tons at 10-ft. radius, without needing outriggers. A Petter AVA2T twocylindered oil-engine drives through a
friction clutch to a three-speed gearbox and to our separate clutches, one for each crane motion.
The clutch for the winch motion gives smooth hoisting_ and sensitive control when lowering is ensured by two spring-controlled shoes working on a large drum. The superstructure runs on a ring of ball bearings, with hook rollers beneath, and can turn a complete circle or be locked in any position. The derrick motion passes through bevel-and-worm gearing, and an automatic brake is provided.
The travel motion goes through a flexible coupling to a gearbox above the centre of rotation of the superstructure, and then through a vertical shaft, The chassis has four wheels with two-leadingshoe brakes, and 7.50-20 pneumatic tyres fitted to steel restrictor• wheels: these protect the sides of the tyres and take the full load if a tyre should become deflated.
The road wheels can be driven either direct, or through a two-wheel or four-wheel differential drive. The two-whet1 differential model can be fitted with either twowheel or four-wheel steering, and with the latter the turning-circle radius is only 13 ft.
The fully enclosed driving cab is on the right front of the superstructure, and a gravity-operated radius/load indicator is fitted on the jib.