Lorry-mounted Crane Gives Good Lift and Manaluvrability
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MOBILE crane which combines 'a useful lifting capacity with nceuvrability and which can be ;ed on a standard chassis for use at )otsseparated by relatively long tances is being marketed by Tunny anes, Ltd., Abbey House, Victoria eet; S.W.J.
lie of these cranes was exhibited the Public Works Exhibition in ndon, described in The Commer1 Motor of November 11. .
L.'apable of handling loads up to tons, the Tunny crane can be )unted on most standard types of issis in the 5-7-ton range. The aipment weighs about 3 tons and ; time for mounting on a prepared assis is about six hours.
Outstanding features of the crane Jude a derricking jib that can be
slewed through an arc of 300 degrees and lowered to a position at the side of the astradome in the cab roof. If required, the mounting block of the crane. can be equipped with wheels and a drawbar for use in conjunction with an agricultural or industrial tractor. '
Hoisting, derricking and slewing are performed by hydraulically actuated rams controlled from the back of the cab.
Maximum Side Projection 5 in.
Maximum projection of the counterweight over the side of the chassis is only 5 in.
A 16 ft. jib gives a radius.. of 6 ft. 9 in. for a load of 2 tons, whilst 12 cwt. can be lifted at a radius of 15 ft. 6 in. With a 26-ft. jib. I ton
can be lifted at a radius of 80 ft. and 4 cwt. at a radius of 25 ft. 6 in. The crane is 20 ft. long and 7 ft. 1 in. wide and when mounted on a normal type of lorry its overall height in the lowered position is 9 ft. 6 in.
Apart from equipping the cab with an astradome, operator seat and controls, chassis modifications comprise the fitting of chassis brackets to locate the base block and the use of spring locks at the rear.
On Thames Chassis A Tunny crane mounted on a Ford Thames 5-ton chassis is used by Morton's (Coventry), Ltd., Binley Road, Coventry for the transfer of cars from road vehicles to rail trucks, the handling of cased tractor parts, and the loading of complete tractors. In a 40-hour week 424 1-ton cars were loaded.
Another on Bedford
Another Coventry operator, Sheppards (Coal and Metal), Ltd., Lewis Road, Coventry, employs a Tunny crane mounted on a Bedford normal-control 5-ton chassis to load scrap metal throughout the Coventry area.
The crane may also be used in conjunction with a four-wheeled trailer to dispense with the need for a separate road vehicle to transport loads from a number of sites to a central depot. If the equipment is mounted on a long-wheelbase vehicle, platform space can be provided for direct loading.