6
Pub. No. 1190 — May 2014
RITE-HITE
®
VBR-500 DOK-LOK
®
Owner’s Manual
DEFINITION AND FUNCTION
The VBR-500 DOK-LOK vehicle restraint is a hydraulic, pit
stored restraint device used to secure trucks and semi-
trailers with an intact Rear Impact Guard (R.I.G.) to the
face of a loading dock. This is achieved by securing the
R.I.G. with a steel barrier. This prevents forward movement
of the truck/trailer that may create an unsafe void between
the face of the dock and the rear end of the truck/trailer as
a forklift travels from the loading dock onto the trailer; or to
create an obstruction noticeable to the truck driver, should
the driver accidentally try to pull the truck/trailer away while
it is being serviced.
The proper or improper activation of the barrier is
monitored by:
•
VISUAL CONTROL
— One set of flashing green or red lights located at the
inside of the building for the forklift operator, and one
set located outside of the building for the truck driver.
In addition to the lights, there are three instruction
signs.
• AUDIO CONTROL
— A horn will sound at the inside of the building,
warning the forklift operator if there is not R.I.G.
present, or if the engagement is improper. In this case,
the trailer must be secured by other means (wheel
chokes, etc.) prior to servicing trailer.
Prerequisite for proper barrier engagement is that the
trailer is parked firmly against a 4" (trade standard) thick
dock bumper. The activation/deactivation is solely
controlled from inside of the building by momentarily
depressing either the Lock (raise) button or the Unlock
(lower) button.
The normal mode of the barrier is in the lower STORED
position, showing a flashing red light (trailer not secured) at
the inside of the building and a flashing green light (trailer
free to move to or away from the loading dock) at the
outside of the building.
Once the trailer is parked, the dock attendant will depress
the Lock button. This will raise the barrier to engage the
R.I.G. As soon as the R.I.G. is properly locked, there will be
a simultaneous light change - the inside will change from
red to green flashing (trailer secured) and the outside will
change from green to red flashing (do not move trailer).
After the service is complete, the dock attendant will have
to depress the Unlock button which then will return the
barrier to its STORED position.
A proper barrier engagement is achieved when the barrier
raises unobstructed to secure the horizontal cross member
of the R.I.G. Assembly. An improper barrier engagement is
if the horizontal cross member of the R.I.G. is missing,
obstructed or it is bent or located so far toward the rear
axle of the trailer that it will prevent the free passage of the
barrier. At this point, the trailer must be secured by other
means (example: wheel chocks) in order to become
serviceable.
