nrose fifth wheel
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'FEW fifth-wheel coupling has been announced by Primrose Group Sales, The unit, of robust design and incorporating pie jaw-locking device, is fabricated from 0.25in, mild steel and it offers, by virtue of its large bearing surfaces, much wear rates.
e plate of the unit is liberally reinforced by both transversed )ngitudinal webs and incorporates a 0.5in.-thick saddle which s the trunnion mountings. The jaw lock comprises a narrow d block which is spring loaded against the locking face of the When released the block allows the jaws to pivot away from ailer king-pin, so releasing it from the fifth wheel.
re-coupling the trailer, the kingpin strikes the centres of the pushing them forward and pivoting them round their mounting When they arc snug around the kingpin the locking aperture ened wide enough for the locking block to be sprung into on. The unit is then in the running position. .
e plate is 36in. wide and has two circular depressions formed surface which act as grease reservoirs.
100-ton alloy steel is used to manufacture the jaw mechanism: ; a tougher material than that normally used for the manufac)f semi-trailer kingpins.
. by: Primrose Group Sales, Ewood, Blackburn, Lancs.