stertil COMBILOK, Manual

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1.8 LOCKING SYSTEM
The Combilok is a fully hydraulic vehicle locking mechanism with integrated wheel guidance, fitted with cylinders
for making a longitudinal and lateral movement. During the longitudinal movement the locking mechanism is
positioned in relation to the wheel of the vehicle.
The locking mechanism is used at loading and unloading platforms, where vehicles are loaded and unloaded with
the back facing the dock. The locking mechanism positions a block in front of the rear wheel of the vehicle so that it
is 'clamped' in between the platform and the block.
The locking device and the hydraulic unit are normally mounted at the driver's side. In the starting position, the
longitudinal guide system is extended (the hydraulic cylinder is telescoped out) so that this section also has a wheel
guide function when the vehicle reverses. The transverse movement block has been slid in, so that there are no
obstacles in the vehicle's track. The control box is positioned on the drivers side inside the building. The traffic light
is also on the drivers side but outside on the wall of the building. In order to guarantee the correct positioning of the
vehicle, a standard wheel restraint is mounted on the drivers' side.
The locking mechanism is automatically positioned in relation to the rearmost wheel of the vehicle in a longitudinal
direction. A block with a height of approximately 350 mm is pushed in front of the detected wheel by means of a
laterally extendible mechanism. The longitudinal movement pushes the block against the wheel. The vehicle is then
locked and the system must firstly be returned to its starting position before the vehicle can depart.
The functions are supported on the control box by indication lights and pictograms, and from outside by means of a
traffic light indicating that the platform is free for docking or departure. Optional an inside trafic light is available,
which is controlled by an additional print in the control box (see FIG. D).
The Combilok is fitted with a microprocessor steering mechanism which ensures that:
- the rearmost wheel is automatically localised and blocked by means of button operation.
- if required, the pressure on the wheel is monitored and corrected.
And, if combined with a hydraulic dock leveller:
- Electrical locking ensures that the dock leveller
cannot be used before the wheel of the vehicle is locked.
- Electrical locking ensures that the vehicle cannot be unlocked when the dock leveller is in operation.
The Combilok can be used as a 'stand-alone' unit. The use of this requires a certain amount of discipline (do not load
when the red indication lamp is on).
A higher level of integration can be achieved by connecting the control to that of the dock leveller. To achieve this
integration, use is made of the 'door' contact of the dock leveller (in Stertil products what is known as the 'D-D'
contact), and an extra switch is mounted on the leveller to scan the neutral position (a limit switch with N.O. contact
under the "Cross Traffic Legs").