RITE-HITE RHR-600 DOK-LOK Owner’s Manual
5
Definition and Function
The RHR-600
DOK-LOK
vehicle restraint is an electro-
mechanical, self-aligning 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 hooking the
R.I.G. with an electrically powered steel hook. 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 hook 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 no R.I.G. present, or if the
engagement is improper. In this case, the trailer must
be secured by other means (wheel chocks, etc.) prior to
servicing trailer.
Prerequisite for proper hook engagement is that the trailer is
parked firmly against a 4" (trade standard) thick dock bumper.
The activation/deactivation is solely controlled from the inside
of the building by momentarily depressing either the LOCK
(raise) button or the UNLOCK (lower) button.
The normal mode of the hook 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 hook to engage the R.I.G. As
soon as the R.I.G. is properly locked, there will be
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 completed, the dock attendant will have to depress
the UNLOCK button which then will return the hook to its lower
stored position.
A proper hook engagement is achieved when the hook raises
unobstructed to fully trap the horizontal cross member of the
R.I.G. Assembly. An improper hook 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 hook. In either case, the
lights will stay in a non-serviceable mode and a horn will
sound. At this point, the trailer must be secured by other means
(example: wheel chocks) in order to become serviceable.
Features
Refer to
Figure 2
for locations of these features:
R.I.G.
Acronym used for the Federally mandated
rear impact
guard
located on the rear of over the road trailers to
prevent accidental underride by automobiles.
Roller Track Assembly
Mounted to the loading dock wall to guide the carriage
assembly in a vertical plane and transmit the creep or pull
out force from a trailer to the loading dock wall.
Carriage Roller Assembly
Comprised of a steel roller housing, a pre-lubricated
needle bearing to allow easy movement of the carriage
assembly.
Carriage Return Springs
Bias the carriage assembly to its upward stored position
and to maintain contact with the R.I.G. while servicing a
trailer.
Lower Spring Bar
Provides a connection between the carriage assembly and
roller track assembly using carriage return springs.
Carriage Assembly
Sloped front provides self-positioning by the R.I.G. and
restrains the trailer once the hook has been activated by
the dock attendant.
Carriage Assembly Slope Extension
Allows trailers with lower R.I.G.s to be serviced by the
DOK-LOK
vehicle restraint.
Hook
Entraps R.I.G. to prevent trailer from rolling/creeping away
from the dock.
Motor Assembly
Provides means of moving the hook between its stored
and active positions.
Spring Covers with Lip Guide
Protect the springs and keep debris out of the roller track
assembly. Right hand cover has an integral lip guide which
is used to guide the lip past the roller track assembly in a
below dock end load condition.
Limit Switches, Control Harness, Control Box, Outside
Light Box, and Signage
Combination of these components is used to control the
RHR-600
DOK-LOK
vehicle restraint and provide audio/
visual communications to the dock attendant and trailer
driver.
Summary of Contents for DOK-LOK RHR-600
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