Crosby IP IP10 Manual Del Usuario página 5

„ When the crane hook or attachment is too large and/or too heavy, use properly sized CrosbyIP
5000 stinger assembly or a chain sling with D-shackle of 75 cm (30 inch), with a strength that
corresponds to the W.L.L. of the clamp. This will, when setting the load down, prevent the hook
from descending to far allowing the clamp to open under the weight of the hook, or, in the case
of an unprotected crane hook, its descending from the lifting eye. When suspending the clamp
directly on the secured crane hook attention must be given to ensuring that the crane hook can
move freely in the lifting eye. Ensure that the crane hook and other material is protected.
„ Remark: when handling the load, one should ensure that the load and or clamp does not
encounter obstacles which could release the load on the clamps prematurely.
„ A clamp is a device that must be clean when used. Dirt has an adverse effect on the operation
and also on the reliability of the clamp. When cleaning the clamp care should be taken to
ensuring that moving parts are lubricated and the gripping surfaces are clean. Regular cleaning
will enhance the life and reliability of the clamps.
3. Inspections protocols
Prior to every application of the clamp it is important the clamp operator inspects the clamp for
proper functioning. Attention must be paid to the following (see illustration(s) 2 for part reference):
„ Ensure that the plate surface with which the clamp is to come into contact is free of scale,
grease, oil, paint, water, ice, moisture, dirt and coatings that might impede the contact of the
gripping surface with the plate.
„ Inspect pivot(s) (C) and camsegment (B) for wear and defects. The pivot(s) and teeth must be
sharp and free of dirt.
„ Check the body (N) and the jaw for damage, cracks or deformation (this may indicate
overloading). The clamp must open and close properly (when the operation of the clamp is stiff
or heavy, it should be removed from operation for inspection).
„ Check the lifting eye (D) and camsegment shaft (G) for readily detectable wear and/or damage.
„ Check the spring (M). Press when the latch lever (A) is closed on the lifting eye (D). There should
be clearly apparent spring tension. The clamp should, when the lifting eye is released, return to
the closed position without problems.
„ Check whether the W.L.L. and the jaw opening stamped on the body corresponds with the
load to be lifted. When this is no longer readable, remove the clamp from operation.
„ Always apply the minimum load, otherwise the load risks slipping out unintentionally.
Minimum load permitted:
5% of the W.L.L. applying to plate surface hardness up to 279 HV10.
10% of the W.L.L. applying to plate surface hardness up to 363 HV10.
For clamps IP(U)10H: 10% of the W.L.L. applying to plate surface hardness up to 472 HV10.
For clamps 0,5 IP(U)10: 5% of the W.L.L. applying to plate surface hardness up to 363 HV10.
The pivot(s) and the camsegment are the most critical parts in the clamp and require extra attention
during inspection. Ensure in any event for good light during inspection. Observe the following rules
during every inspection:
Pivot(s): Reject when the sharpness of one ring is damaged or worn for 50% or more.
Camsegment: Reject when the sharpness of one tooth is damaged or worn for 50% or more.
On the inside of the front cover illustrations have been included of damaged and worn (rejected)
pivots and camsegments:
1. One complete tooth not sharp and one damaged
2. Two teeth damaged for 50%
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