REMA WF Série Mode D'emploi page 26

5.1 Features
1. The load-acting points on both the screw cap and the cam are hemispherical
(pivot-shaped). Consequently, if the suspension load moves by even a minute
amount, the clamp will rotate in synchronism with this motion and tilt in the
forward direction. This in turn will cause the teeth to cut into the suspension
load with a large force. (Refer to Fig. 1.)
2. Even if the clamp is overloaded to 120%, the cut-in depth will only be about 0.2
to 0.5 mm (differs depending upon the capacity), which is about one half that of
a general clamp. Also, the tooth profile is circular, so harmful pressure marks
are not left on the suspension load, thus ensuring peace of mind. (Refer to Fig.
2.)
3. A fine screw (automatic tightening) is used to apply a tightening force and also
prevent the screw from slackening easily. (Refer to Fig. 3.)
4. During hoisting work, even in the event that the handle strikes another
structural object, causing the screw to work loose (to 60 or less), the holding
force of the screw (stroke generated by the tilt of the teeth) will greatly exceed
the slackening of the screw, enabling you to use the clamp with peace of mind.
5. This is the world's lightest clamp. It can be used even by female workers.
6. A hemispherical W cam system is employed, causing the clamp to cut into the
load from both sides. (Refer to Fig. 1.)
7. Two suspension holes are provided, enabling the load to be suspended from
any direction. (Refer to Fig. 4.)
8. The head of the screw has a hex hole for a ratchet spanner (B = 21). This
enables you to install the clamp in a confined space without using the handle.
(Refer to Fig. 3.)
9. You can use the clamp on a load whose grip surfaces are inclined at an angle
of less than 10 with respect to each other (8 I-beam). Refer to item 8 of
"Precautions for use."
10. You can use the clamp instead of an I-plate. (Refer to Fig. 5.)
5.2 Applications
This clamp can be used for hoisting, inverting and conveying steel sheets (intended to be placed on the
ground), shaped steel (H-sections, I-beams), pipes, reinforced steel beams, pillars, shipbuilding materials
and structures, and also extracting short sheet piles.
5.3 Pre-work Check
Before commencing the day's work, carry out the following inspections and checks.
(Refer to Table 1 for the checking items of various models of clamps.)
5. Appearance and function. (damage to the
body, operating condition of the screw,
rotation and tilt of the screw cap and cam,
wear and clogging of the teeth, and so on)
Refer to Fig. 1 and item 2 of "Precautions for
use."
6. Maximum work load indication and minimum
working load. (This is 1/10 of the force
equivalent to the maximum working load. In the case of a general clamp, it is 1/5.)
7. Effective sheet thickness. (Refer to Table 1.)
8. Use clamps that are suitable for the mass of the load to be suspended.
Model Max working
load (T)
WF-0.5 0.5
WF-1 1.0
WF-2 2.0
WF-3 3.0
WF-5 5.0
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Min working Effevtive sheet
load (T) thickness (mm)
0.05 3-28
0.1 3-40
0.2 3-45
0.3 6-49
0.5 9-53