Artic coupling gets tougher • The twin-jaw Davies Magnet fifth-wheel
14th January 1993, Page 10
14th January 1993
Page 10
Page 10, 14th January 1993
— Artic coupling gets tougher • The twin-jaw Davies Magnet fifth-wheel
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coupling has been made more rigid and easier to use. Extra springs have been introduced to hold the forgedsteel jaws open, clear of the throat, after the king pin is withdrawn, preventing blocking and subsequent re-entry. When coupling the jaws only close if the pin is at the correct height.
In the process a locking block slides between the ears of the jaws, making it impossible to part them until withdrawn for uncoupling. A power release can be piped into the vehicle's compressed air system.
The steel plates have been given extra support to enhance roll control, while stiffer rubber bushes in the trunnions cushion the imposed load.