JIB CRANES WITH AN ARTICULATED ARM MANUALLY ROTATED

DONATI SOLLEVAMENTI S.r.l. - Via Roma, 55 - 21020 Daverio (VA) - Tel. 0332 942611 - Fax. 0332 948597
2.2.5 Noise - Vibrations
• The jib cranes with articulated arm, being manually rotated, do not create noise during the
movement of the flexing of the arm.
• The vibrations produced by the jib crane, during the manual rotation of the arm, are practically
nil and in any case not dangerous for the health of the staff who operate them.
• Excessive noise or vibration can be caused by a fault which must be immediately notified and
eliminated so as not to compromise the reliability of the jib crane.
2.2.6 Criteria of use and conditions of use
§ The necessary indispensable conditions to obtain the full functional responsiveness of the jib crane for
the service it is intended, as well as its optimal and lasting functioning, are in the correct choice of the
model of machine. This choice must be made in relation to the real service performance required as well
as the environmental conditions in which the jib crane will have to operate.
§ The parameters which must be carefully considered in the choice of jib crane are:
The lifting capacity: this must be determined by the weight of the maximum load to be lifted and must
never be.
The functional dimensions : the height of the arm which determines the hook run of the hoist and the
range must be selected so as to guarantee the functional coverage of the space to be used
considering the surrounding clearance
The nature of the load : the nature of the load determines for its positioning the choice of the speeds of
movement (lifting) suited to the task. In some cases it is indispensable to use two-speed hoists with a slow
positioning speed.
The area to be used in : the jib crane with articulated arm features in its conception intrinsic high
elasticity which becomes even more evident when it is used for moving loads close to the maximum load
and/or with prevalent localisation in the ends of the arm.
The environment to be used in : the jib cranes with articulated arm are intended for service indoors
and/or in a covered area, sheltered from bad weather and away from wind. In the case of use outdoors
adequate steps must be taken in relation to the surface treatment (sanding, varnishing) as well as a
system of stopping brake.
The frequency of use : if the use is very intense (frequent manoeuvres and/or repeated ones) with loads
close to the maximum lifting capacity, the consequent fatigue of the operator due to the manual
movements must be taken into account.
• The correct evaluation of the parameters indicated above, in the case of the
parameters being close to the upper limits, can lead to the need to use a crane with
higher performance features which, once gone beyond, can guarantee more rigidity
and fewer translating and rotating strains.
8