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Leyland/Carrimore Export Timber Carrier
Page 91
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ONE of the latest outfits to be completed by Carrirnore Six Wheelers Ltd., of Finchley, North London, is this unusual pole wagon. It has been produced for the Ashanti Gold Mining Co. of Ghana, West Africa.
The outfit has a 4 x 4 tractive unit specially converted by Scammell Lorries Ltd. This started life as a Leyland Comet and has been equipped with a transfer box and driven front axle. The semi-trailer is unusual in that it can be loaded from the ground by means of a series of pulleys and rollers around which wire ropes are run and wound in by a double winch which is also mounted on the tractive unit In the standard method used for many years by the logging companies, where logs are winched on to the bolsters of the pole trailer by a wire rope payed out from the winch of either a crawler employed on site or, in the case of the pole trailer being of the drawbar type, by the road tractor. This articulated vehicle can load itself without the need to uncouple from its semi-trailer. The winch gear was made by the Guildford company of Martin Harper, the actual winches being made by its associate company, Whin Engineering Co. Ltd.
Driven by a power-take-off mounted on the offside of the gearbox, a roller-chain drive is taken to a pair of reversible gearboxes having ratios of 1 to 1 in one direction and 0.667 to 1 in the other. From the output side of these units a second roller-chain drive is taken to each individual winch unit. These incorporate worm-and-wheel drive with a ratio of 33 to 1 and the effort produced at the drum surface—that is to say on the first layer of the cable—is 10,000 lb. straight pull.
Controls are positioned at both sides of the tractive unit and consist of two levers linked to the clutch units of the reversing gearboxes, giving single-lever control of each winch. In order that they can be used separately if required, the winches are also fitted with a dog clutch on the drum spindle.
The front, or turntable bolster, is fabricated from rolled steel-channel and carries the rubbing plate for the fifth wheel. The box formed by the two main-members of the bolster, carries within it pulley wheels over which the cable is led to carry it from the winch drums to either end of the bolster.
Provision is made at both ends for the fitting of a removable jockey wheel and there are also positions for other jockeywheels in the top of the bolster. A toothed anti-slip plate is welded to each end of the bolster and against this a small diameter log is laid to form a ramp up which the logs to be loaded are winched.
The bolster on the rear bogie is made up in exactly the same manner except that in this case it carries the sub-frame for the running gear instead of the fifth-wheel upper plate. Both bolsters are 8 ft. 6 in. wide.
Running gear is of the single-axle type and is fitted with 15.25 in. by 5 in. 2LS cam-operated brakes, powered by compressed air through single-diaphragm chambers and equipped with a wheel-andscrew parking arrangement.
A Leyland front axle and a Scammell transfer box have been used in the conversion and to secure the necessary increase in the chassis height, Scammell rear spring hangers have also been used. Both the front and rear axles incorporate reduction hubs and an overall ratio of 6.933 to 1 is used. The wheelbase of the tractor is 9 ft. 10 in. and the maximum length between centres on the bolsters is 23 ft. 3 in.
The outfit is equipped with 9.00-20 12 ply on/off road type tyres, all wheels being interchangeable. The unladen weight of the tractive unit is 5 tons 13 cwt. 2 qtr. and the outfit complete weighs 7 ton 10 cwt. 3 qtr. The machine has a capacity of 12 tons, and logs of up to 4 tons dead weight can be lifted.