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• The Government-backed National Research Development Corporation, believing that present
Page 63
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anti-skid devices are too expensive for widespread adoption, is backing a new anti-jackknife device designed by a Bristol draughtsman, Mr. Reginald Goold.
Illustrated here, the device is clamped to the trailer kingpin and has two flat sides which locate it relative to the fifth-wheel plate. As the tractor and trailer couple, the device is automatically joined to a linkage for the steering gear. Driven from the steering is a two-lobe cam, controlling the positions of four wedges which are constrained to move radially. The roughly quadrant-shaped wedges are tapered radially upwards away from the axis of the device, and circumferentially away from the fore/aft centre-line.
The kingpin is machined to mesh in with the wedges so that its rotation relative to the fifthwheel plate must follow the rotation of the steeringcontrolled cam, or the kingpin will be joined by the wedges, locking the vehicle in the tractor/trailer angle it occupies at that time.
NRDC is now sponsoring a test programme; bench tests of over-size models at the new Centre for Industrial Innovation of the University of Strathclyde will be followed by vehicle road tests of prototypes. NRDC hopes to have an assessment of its worth by the end of the year.