6
RATED CAPACITY:
The rated capacity of a
Campbell
®
clamp is based on a clamp in “new”
or “as new” condition. It is the maximum load
that the product may lift when used in the way
described in this manual. Wear, misuse, abuse
and other use factors may lower the rated capacity.
These factors and shock loading must be considered
when choosing a Campbell clamp for a job.
WORKING LOAD LIMIT (WLL):
The maximum load that should ever be applied to a
Campbell clamp. The Working Load Limit is forged into or stamped on the body of
every clamp (Fig. 4).
SHOCK LOAD:
A force that results from the rapid movement of a load. A shock load
force is much greater than a force of a motionless load.
GRIP RANGE:
The minimum and maximum plate thickness that a clamp can lift.
JAW OPENING:
The capacity (grip range) of a clamp in terms of plate thickness.
OPERATING TEMPERATURES:
Campbell clamps are designed for operation only
in temperatures ranging from 0 to 200 degrees Fahrenheit. This range applies to both
ambient and material temperatures.
LEVER-OPEN/ LEVER-CLOSED:
This feature makes it easier to attach and remove
the clamp. A lever-actuated spring holds the cam in contact (lever closed) or away from
(lever open) the plate.
CAM ENGAGING LEVER (Locking Lever):
A lever or chain activated spring that holds
the cam away from or in contact with the plate. This makes clamp operation easier. The
Campbell “GXL” and “E” clamps have this feature. These clamps will not lift a plate when
in the “lock open” position.
SCREW-ADJUSTED CAM:
Convex cylindrical cams attached to a special screw
which, when tightened, places and keeps the cam in contact with the plate.
SPRING-LOADED CAM:
Cam loaded by double torsional spring, which stays
engaged even under “no load” conditions.
Figure 4
WARNING!: A notice pointing out danger, informing the operator and others
that they should protect themselves.
WARNING!: Never lift a plate that is not within the grip range forged or stamped
on the clamp.
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