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George Neville's tipping trailer
Page 53
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by Paul Brockington • The need to provide good stability and traction was the main preoccupation of Mr. George Neville when he was designing the York /Neville 31-ton gross, 20 cu.yd., all steel tipping trailer, which was completed one day before the Commercial Motor Show and can be seen in the demonstration park.
Mr. Neville designed the Neville dump trailer and recently formed a new company, Neville Truck Equipment Ltd., Kirby-in Ashfield, near Mansfield, Notts, to build a range of semi-trailers that will be marketed under a York /Neville banner through the York Trailer distributor network. Service and spares will be provided through York's eight regional service depots. It is estimated that units will be produced at a rate of four a week early in 1969.
Tipping stability is provided by mounting the trunnion housings on a tipping hinge bar that is only 12in. from the ground (6in.
below the wheel centres) and, by using a special rubber sandwich suspension having metalastik Chevron rubber springs (de signed by Mr. Neville), that deflects only lin. from unladen to fully laden. The fully articulated bogie assembly incorporates two York 10-ton axles and the load is equally distributed between the four wheels.
A simple type of pin-and-lever load indicator, linked to the suspension assembly has a leverage of 4 to 1 and enables the load on each side of the axle to be gauged within about plus or minus !cwt. by taking reading from a quadrant scale. The cost of the vehicle, £3,360; the cost of the indicator is only £4.
It is noteworthy when considering traction that the load on the trailer bogie is 3 tons 2cwt when the vehicle is unladen, whereas the load on the bogie of the Foden tractive unit (to which the Show model is coupled) is 5 tons 7cwt, the load on the front axle of the tractive unit being 3 tons 9cwt. When the vehicle is laden the loadings are 13 tons 12cwt, 14 tons 17cwt and 3 tons 9cwt respectively. The dump body is contoured to give these balanced loadings.
Operated by a three-line air system the brakes provide a total lining area of 884 sq.in. Of particular note, brake torque reaction is resisted by polyurethane pads mounted below the axles.
The mild-steel body is of 10-gauge material and is constructed of 4ft sections. Ribs are incorporated in the sections which are pressed-out in a special machine.
Also of importance to stability, the radial-arm assembly features a robust torsion tube at the point of maximum torsional deflection. The trailer is elevated by an Edbro 6SC single-ram lifting gear mounted forward of the axis of the coupling.