Fifth wheel
Page 46
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Following on from the TJ 3 pressed steel fifth-wheel coupling from Davies Magnet, the company has introduced a heavy-section cast main plate version. Coded the TJ3C the coupling has been designed for normal haulage operations where International Standards permit the use of a 50mm (2in) kingpin It is claimed that the twin-jaw design ensures a 360 grip about the pin with no wearing contact between the kingpin diameter and the main plate. The pressure areas of the jaws and the plunger are induction hardened to withstand high shock loadings. The coupling has integrally cast grease retaining areas with all the lubricating points situated externally at the side of the main plate which the company claims eliminates any need for disconnecting the trailer for routine lubrication of the rubbing plate.
Neoprane rubber cushioned trunnions set in heavy-section welded brackets allow free