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148 
Lockable Drawbar for Independent Trailer
Page 55
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rAA NOVEL form of drawbar assembly has been developed for use with independent trailers by Carrimore Six Wheelers. Ltd., London, N.12. Locking stays are incorporated whereby not only can the drawbar be locked in a horizontal position. but the front turntable is rigidly held in the straight-ahead position.
The arrangement is embodied in four 15-ton trailers being built by Carrimore to special order. The trailers will be solely engaged on internal works transport in conjunction with two Fordson Power Major oil-engined industrial tractors.
Because of a difficult approach to the loading dock, the customers specified that the front wheels of the trailers must be capable of being lifted free of the ground, so that all the front-end weight of the trailer was carried by the towing-pin attachment at the rear of the tractor. Thus, the tractor-trailer combination could be reversed more easily into the loading-bay opening than would be the case if the trailer were a conventional independent unit. The locking arrangement is intended to be used only when the trailers arc empty: after loading in the bay they will be towed out forwards with all wheels on the ground in the conventional manner.
The locking mechanism consists of a triangulated locking-stay assembly which is pivoted to the front of the trailer main frame.. When the towing drawbar is used normally, the locking stay is secured to the steel headboard in a vertical position. To lock the drawbar and turntable, the stay is lowered and pinned to a lug at the front of the drawbar. With the pin in position, the drawbar is held rigid.
When the drawbar is locked, the towing eye slides up a short ramp at the back of the tractor, adjacent to the towing pin, and as the eye rises up the ramp so the front wheels are lifted clear of the ground and the unit becomes, in effect, articulated.
The trailer hand-brake lever is 'atthe front of the drawbar, so that the tractor driver may control coupling and uncoupling operations without leaving his seat.
The Carrimore trailers have 22-ft. by 7-ft. 5-in, decks with flush rave rails, so that pallet-loading methods may be employed. All wheels carry 8.25-15-in. (14-ply) twin tyres, which give sufficient load capacity for the slow speeds at which
the trailers will be worked. Vacuumoperated brakes are employed at both axles, consequently the tractors are equipped with vacuum exhausters, and the turntable has a full-diameter doublerow ball bearing.