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The Sliding Fifth-Wheel

The Sliding Fifth-Wheel. (Left click to advance). 1.6 M (63¨ inch) kingpin. 1.6 M (63¨ inch) kingpin. .9 M (36¨ inch) kingpin. .9 M (36¨ inch) kingpin. The SFW is moved forward to accommodate a shorter pin length of 0·9 m and to close the gap as much as possible for fuel efficiency.

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The Sliding Fifth-Wheel

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  1. The Sliding Fifth-Wheel (Left click to advance) 1.6 M (63¨ inch) kingpin 1.6 M (63¨ inch) kingpin .9 M (36¨ inch) kingpin .9 M (36¨ inch) kingpin The SFW is moved forward to accommodate a shorter pin length of 0·9 m and to close the gap as much as possible for fuel efficiency If it remained in the ‘forward’ position and a 1·6 m pin length trailer was picked up, the trailer would collide with the tractor. So it is recommended that the SFW is returned to the ‘back’ position each time when uncoupling to prevent damage during the coupling-up procedure and then moved forward if necessary to the working position. 67cms or 26¨ 1.6 M (63¨) 0.9 M (36¨) (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  2. When the next trailer is coupled-up the slider can then be moved to the ‘FORWARD’ or the working position if necessary. Best Practice Recommendation – Before uncoupling a trailer the fifth-wheel must be returned to the ‘BACK’ position of the slider. F B (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  3. FACT - If the fifth-wheel is returned to the ‘BACK’ position every time when uncoupling and then moved to the ‘FORWARD’ or working position there can NEVER be any damage occurrence. It also allows for a safe working space for the driver to conduct any line connections. F B (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  4. The Sliding Fifth-Wheel (Left click to advance) 1.6 M (63¨ inch) kingpin B /F Sometimes, in the case of a 1·6 m length kingpin the ‘Back’ (fully extended) position can also be the ‘front’ (working) position without the SFW ever having to move. 1.6 M (63¨) (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  5. Two-positioned Fifth-Wheel In the case of a two-positioned fifth-wheel the ‘forward’ position is the ONLY working position – usually for a 1·6 m length kingpin and the ‘back’ position is for uncoupling / coupling-up only F B (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  6. Current Methods of Re-positioning - couple-up safely Kingpin 4 inch tolerance Trailer legs / bodywork TRAILER (Left click to advance) (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  7. Current Methods of Re-positioning – be careful of fifth-wheel location Kingpin COLLISION 4 inch tolerance Trailer legs / bodywork COLLISION TRAILER (Left click to advance) (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  8. Trailer – Articulation Check (Left click to advance)

  9. Current Methods of Re-positioning You must consider the trailer legs and the rear corner of the unit when at 45º. So once you’ve manoeuvred the combination to about 45º get out and check the clearance gap as shown. (Left click to advance) 4 inch tolerance Trailer legs / bodywork (Left click to advance) (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  10. Current Methods of Re-positioning You must also consider the front corner of the trailer and the rear of the unit when at 45º. So once you’ve manoeuvred the combination to about 45º get out and check the clearance gap as shown. (Left click to advance) Zero Datum 4 inch tolerance Trailer legs / bodywork (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  11. Current Methods of Re-positioning – be careful though, wrongly positioned slider 4 inch tolerance 4 inch tolerance Trailer legs / bodywork (Left click to advance) (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  12. Current Methods of Re-positioning – consider the collision points Zero Datum 4 inch tolerance 4 inch tolerance Trailer legs (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  13. Fuel Efficiency is Important (Left click to advance)

  14. Current Methods of Re-positioning Currently the positioning is done by guesswork. This could take several attempts and therefore too time consuming. There is also a good chance of causing damage and therefore many companies wont allow it to be done for these reasons! (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  15. Disadvantages • Too time consuming • There’s a higher risk of causing damage to the equipment • There’s a greater risk of personal injury • Increased wear and tear to the vehicle • Increased fuel usage • It is not completely accurate (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  16. Using the Stop Gap System THIS SPACE IS KNOWN AS ‘THE TRAILER GAP’. OR TO THE LEFT OF THE CENTRELINE OF KINGPIN THIS SPACE IS KNOWN AS ‘THE CAB GAP’. OR TO THE RIGHT OF THE CENTRELINE OF KINGPIN (Left click to advance)

  17. Trailer Kingpin Location 1.6 M or 63″ pin .9 M or 36″ pin (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  18. 175 209 THIS SPACE IS KNOWN AS ‘THE TRAILER GAP’. THIS SPACE IS KNOWN AS ‘THE CAB GAP’. THE TRAILER PLATE The trailer kingpin depth and the sliding fifth-wheel location is the deciding factor as to whether or not any coupling-up can be accomplished. They hold the CRUCIAL dimensions – ‘THE TRAILER GAP’ and ‘THE CAB GAP’! The trailer has two figures on the dimension plate. (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  19. TRAILER ID - - - - - - - - - - - TECHNICIAN ID - - - 209 © STOP-GAP ™ TRAILER DIMENSION PLATE TRAILER GAP CAB GAP The trailer dimension plate is found near or on the headboard giving the two figures 175 (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  20. TRAILER ID - - - - - - - - - - - TECHNICIAN ID - - - 209 © STOP-GAP ™ TRAILER DIMENSION PLATE TRAILER GAP CAB GAP The trailer dimension plate figures are then transferred onto the location rails on the tractor chassis using the left-side of the contact markers. 175 (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  21. The sliding fifth-wheel is then moved from the ‘BACK’ position on the slider to make contact with the FIRST marker. This is the OPTIMUM position. It’s that simple!! © Jim Thomson International PCT Number PCT/GB2008/050363 (Left click to advance)

  22. If you make contact with the red marker first you have the best fuel position. If you make contact with the blue marker first then you have the optimum position available before the trailer legs and tractor rear collides. (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  23. YOU MUST STOP THE SLIDER MOVEMENT WHEN YOU REACH THE NEAREST CONTACT MARKER!! Under NO CIRCUMSTANCES must any of the contact markers be to the left of the fifth-wheel centreline pointer!! This would mean that the safe figures for operation have been compromised resulting in probable damage. (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

  24. The slider locking handle is then released to lock-in the pins or in the case of an air-assisted locking device the button in the cab is then activated to lock the pins into one of the slider increments. TRAILER TRACTOR The locking pin has locked-in but slightly further away from the tractor due to a suitable increment not being available The Fifth-Wheel is held stationary by the trailer handbrake and (if being used), chocked wheels so any adjustment is done by moving the tractor TRACTOR TRACTOR (Left click to advance) (Left click to lock pins into location) The locking pin is not quite lining up. It is too short of a clean location and so this means driving the tractor forward slightly moving the S F/W away from the tractor shell until the pins lock-in to their next available position.

  25. The Benefits • The device removes any element of doubt when coupling by visually showing the driver the best place for the trailer in terms of safe clearance and, as an added benefit, the best trailer gap for optimum fuel economy. • It is simple to use. • It cuts right down on time to complete optimum position and is completely accurate. • Less wear and tear on the vehicle. • Reduces fuel being used. (Left click to advance) © Jim Thomson International PCT Number PCT/GB2008/050363

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