Mechanical Dock Leveler – M and FMC Group 03, Section 01, Page 7
Issue Date: 10/01/01, Rev. 0 (Part #038-550E)
DETAIL OF COMPONENT FUNCTIONS – cont’d
In this picture you can see the
working components of the hold
down system.
They are:
–Handle Assembly
– Rewind Wheel
– Coil Spring
– Wear Strip
– Counter Weight
– Knurled Lock Roller
– Cable, etc.
The hold down mechanism is
designed to work as a one-way
direction check for the cable.
As you can see here, the rewind spring is always trying to pull the cable
towards the hold down box. The rewind spring only has enough power
to rewind the cable as the deck moves downward.
The cable can always move toward the box when the deck is moving
downward however, because of the braking action applied to the cable
by the hold down box, the cable can not move outward until the brake is
released by pulling the operating chain.
This devices makes sure that the dock leveler always maintains a
positive downward force – through the lip when it is engaged with the
truck floor.
Since the brake creates a positive downward action to keep the lip
engaged with the truck floor, it is necessary to provide for and allow
movement of the deck and lip in an upward direction. This would occur
as a truck is being unloaded. As the load on the truck lightens, the
suspension tends to raise the truck bed.
As you can see here – this non-positive cushioned action is provided
through the cable by the float spring.
To Next Page
Loading...
