Manual And Electric Jib Cranes


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MANUAL AND ELECTRIC JIB CRANES
GBA/GBP Series CBB/MBB Series CBE/MBE Series GBR/GBL Series

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JIB CRANES
The most complete range for local handling of loads up to 10,000 kg.
The result of in-depth knowledge of the most wide ranging applications, Donati jib cranes offer the most complete range of solutions for local handling of loads up to 10,000 kg. Mass production performed with consolidated industrialised processes makes it possible to create completely reliable and technically innovative cranes with an excellent price/performance ratio. The quality of the components used, and the excellent finishing of the metal structural work, as well as the EN ISO 9001 certified quality system allows us to offer a top quality product and always in line with the most modern international standards. Donati’s expertise in designing and manufacturing jib cranes and wire rope and chain hoists, ensures perfect component integration, as well as always satisfying both standardised and special installation requests.

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MAX 10,000 KG
The complete range for local handling solutions

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CONCEPT CONSTRUCTION AND THE RANGE

Jib cranes, with manual or electric rotation in column or wall versions, are created to locally handle goods inside a plant, on a square or along with operating stations. Studied and designed also for use in difficult environmental conditions, jib cranes become full operating machines if used and integrated into production centres, machine tools or work benches. They adopt standardised parts which make it possible to create completely standardised configurations.
Jib cranes perform three operations:  they vertically lift the load in space, using the
hook of the lifting unit, generally composed of a DMK chain hoist or DRH wire rope hoist; they move the load transversally in space, with the use of a hoist-carrying trolley, either electric or manual, which moves along the radial axis of the crane arm (with the exception of cranes with articulated arm where the hoist normally does not move on the trolley since it is connected in a fixed position at the end of the arm); they rotate the load in space, around the constrained axis of the arm, through a manual push action of the load or electrically by means of a gear motor, serving the circular area below, limited by the rotation radius of the arm.

Jib cranes are mass produced for capacities starting from 63 to 10,000 kg and jibs from 2 to 10.5 m in the following executions:
Jib cranes with manual rotation, max. capacity 2,000 kg • GBA SERIES column-mounted, 300° rotation • GBP SERIES wall-mounted, 270° rotation Jib cranes with articulated arm, max. capacity 500 kg • CBB SERIES column-mounted, 360° manual rotation • MBB SERIES wall-mounted, 360° manual rotation  Jib cranes with motorised arm, max. capacity 2,000 kg • CBE SERIES column-mounted, 300° electric rotation • MBE SERIES wall-mounted, 270° electric rotation Jib cranes with continuous electric rotation, max. capacity 10,000 kg • GBR SERIES column-mounted, 360° electric rotation Jib cranes with continuous electric rotation, max. capacity 5,000 kg and max. manual capacity 2,000 kg • GBL SERIES column-mounted, 360° continuous rotation

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CONSTRUCTION CHARACTERISTICS

MODULAR COMPONENTS Thanks to the modular components all Donati jib cranes are tailor-made for customer needs in a fast and efficient way - as standardised as well as special configurations. Basic versions are always available in the warehouse. Because of their extreme compactness the base components, columns, brackets and arms, enable the maximum use of the hook run and, thanks to their minimum lateral headroom, allow the optimal use in the operating area.
COLUMN The column jib crane consists of a supporting column, made of press forged steel with a tubular structure with a polygonal section. This allows a high rigidity and stability of the crane and is fixed to the base with a base plate and a system of bolts and lug bolts. In the upper part a pair of plates support the arm and allow it to rotate.
SUPPORT BRACKET The wall-mounted jib crane consists of a bracket support structure. This is formed by a pair of plates made of press-forged steel, fixed to the wall or anchored to a pillar with staybolts or screws which act as a support to the arm and allow it to rotate.
ROTATING ARM The arm, rotating around its own axis, consists of a supporting girder for the run of the hoist-carrying trolley. Depending on the model it can be made in profile or channel version designed by Donati.
BRAKING DEVICE OF THE ARM The arm of the manually rotated jib crane is fitted in all models with a braking system. The brake, the clutch with asbestos-free friction material, allows the regulation of the force of rotation of the arm and ensures the stability of positioning.

FIXING SYSTEMS OF THE CRANE Foundation frame with lug bolts. The jib cranes are generally designed to be fixed to the ground using the foundation frame with lug bolts inserted in the foundation plinth. Chemical bolts. The fixing of the column to the floor can be done using chemical bolts, also with a counterplate where necessary which allows better distribution of forces. Brackets and staybolts unit. This is used for fixing the bracket jib crane to a supporting pillar and is fitted with a pressure screw system which guarantees a better adhesion of the staybolts to the pillar.

DONATI LIFTING EQUIPMENT Safe, versatile DMK electric chain hoists are used and for higher loads the DRH electric wire rope hoists (installed only on GBR and GBL series cranes) with 1 or 2 lifting and moving speeds.

HEIGHT OF COLUMNS AND LENGTH OF ARMS The range of the jib cranes is characterised by a vast availability of standard models and made-to-measure in special models. All the cranes with a column of “base” height and also in half-metre variation, the cranes up to a top height of two metres as shown in the following table are standard models:

SERIES
GBA CBB-CBE
GBR GBL

“STANDARD” HEIGHT OF THE COLUMNS (m)

CRANE HEIGHT

DIMENSION

“BASE” HEIGHT

OTHER “STANDARD” HEIGHTS

R-S

H

3

3.5 4 4.5 5

T-U

H

3.5

4 4.5 5 5.5

V-Z

H

4

4.5 5 5.5 6

2-3-4-5-6

h

4

4.5 5 5.5 6

2-3

h

3,5

4- - -

5

h

4

4.5 - - -

All the cranes with columns of heights different from the standard ones with “made to measure” heights are made in special execution or exceeding two metres or of a lower height with respect to the “base” column. There are also special cranes with arms lengths other than the standard ones in the technical tables.

FINISHING Protection from atmospheric agents (dust, etc.) is guaranteed by a painting treatment that includes the application of a coat of yellow two component acrylic polyurethane enamel with a 50 micron thickness, after preparation of the surfaces with metallic sandblasting with SA2 grade. Drying in an oven for 15 minutes at a temperature of 45/50°C concludes the cycle.
SERVICE CLASS The structural elements of the manually or electrically rotated, column-mounted or wall-mounted, jib cranes are dimensioned in the class of service ISO A5 (according to ISO 4301-1/88).
PROTECTION AND INSULATION OF ELECTRICAL PARTS
Rotation motor: Protection IP54 (motors) IP23 (brakes); insulation class “F” (where necessary) Electrical panel: Minimum protection IP55 - Maximum voltage insulation 1500V (where necessary) Push-button panel: Protection IP65 - Maximum voltage insulation 500V (where necessary) Collector ring: Protection IP65 - Maximum voltage insulation 600V (where necessary) Rotation limit switch: Protection IP65 - Maximum voltage insulation 500V (where necessary) Connector blocks: Minimum protection IP65 - Maximum voltage insulation 1500V Cables: CEI 20/22 - Maximum power insulation 450/750V.
ELECTRIC POWER SUPPLY The electrical jib cranes are designed to be powered with alternate electric power three-phase of: 400V according to IEC38-1. The CBE series “column” and MBE “wall” electrically rotated jib cranes must be powered with alternate electrical power with three-phase power + neutral + earth (~ 3 + N + T).
ENVIRONMENTAL CONDITIONS OF USE Use temperatures: minimum - 10° C; maximum + 40°C Maximum relative humidity: 80% - Maximum altitude 1000 m above sea level. The standard crane must be installed in a ventilated environment, free from corrosive vapours (acid vapours, saline clouds, etc) and is designed for use in an indoor area (protected from bad weather). On request the crane can be supplied in the version designed for outdoor use.

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NOISE The level of acoustic pressure emitted by the hoist is always lower than 85 dB (A). The incidence of environmental characteristics such as transmission of sound by metallic structures, reflection caused by combined machines and walls, is not included in the figure shown.
Rotation stops for arms on GBA and GBP
Cantilever arm on GBA

Cantilever and overbraced arms on GBP

Overbraced arms on GBA

SPECIAL VERSIONS On request the following can be supplied for jib cranes:
Special anticorrosive paint. Protection cover for motors and control panel (GBR series). Hoist-trolley protection cover in standby position (GBA/GBP - CBE/MBE series). Gear protection guard (CBE/MBE series). Rotation motor with stainless steel brake blocks and / or tropicalisation (for electrically rotated cranes). Anti-condensation heaters. Rotation stops (GBA/GBP series). Supplementary electrical safety limit switches (for electrically rotated cranes). Power supply voltages different from the standard ones (for electrically rotated cranes). Columns with double opposite and parallel arms (GBA series). Customised column heights and arm lengths. Galvanised treatment for GBA/GBP series cranes with T and H version arm.

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MANUALLY ROTATED JIB CRANES
GBA “COLUMN” SERIES
MAXIMUM ROTATION FIELD 300° (290° IN THE T VERSION)
GBP “WALL” SERIES
MAXIMUM ROTATION FIELD 270° (250° IN THE T VERSION)

THE MANUALLY ROTATED JIB CRANES IN THE GBA “COLUMN” SERIES AND THE GBP “WALL” SERIES are designed for the handling of goods inside a plant, in a square or to serve operative purposes. The standard models are available for lifting capacities from 63 to 2,000 kg and jibs from 2 to 8 m. The S-T-H- versions are designed according to the three different versions of the arm.
“T” CANTILEVER VERSION FOR LIFTING CAPACITIES FROM 63 kg TO 2,000 kg AND JIBS FROM 2 TO 5 m The arm is made using a laminated double T-beam form: the hoist carrying trolley runs on the lower flange of the T-beam. The girder is self-supporting and cantilevered, so it has no support staybolts, and it is directly integral with, via suitable reinforcements, the rotation tube. This version allows the optimum use of the available space at a height due to the absence of staybolts and allows the maximum use of the hook run. The arm allows the additional of electrical or mechanical push-trolleys.

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“H” OVERBRACED VERSION FOR LIFTING CAPACITIES FROM 125 kg TO 2,000 kg AND JIBS FROM 4 TO 8 m The arm is made using a laminated double T-beam form: the hoist carrying trolley runs on the lower flange of the T-beam. The arm is fitted with one or two staybolts to support the profile which connect it to the rotation tube. This version allows the use of the jib crane for loads and jibs superior to those possible with the S and T versions. The arm allows the addition of electrical and mechanical push-trolleys.
ELECTRICAL POWER SUPPLY This is designed to power the hoist and/or electrical trolley, which run along the jib of the crane. It uses a connection box for the connection between the line and the power festoon cable, situated at the top of the column crane near the bracket support in the wall version. The column crane can be supplied, on request, with a main on / off line switch which can be padlocked. The distribution of energy takes place via a flame-retardant flat festoon cable which slides on specific trolleys or slides along the arm.

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NEW S SERIES JIB CRANES IN CHANNEL PROFILE
For capacities from 63 to 1,000 kg and jibs from 2 to 7 m, with manual rotation.
The new S series combines tradition and innovation and is characterised by the extreme lightness of movement due to the low inertia resulting from its reduced weight. The arm is made using a sheet metal section bar inside which the trolley runs characterised by high movement fluidity thanks to the high quality components used. The combination of these elements makes the S series light, simple and easy to move. Its new channel profile used to create the jib crane arm is a special cold rolled sheet metal profile, which stands out due to its smooth surface, high rigidity and its reduced weight. Special guide surfaces and slightly inclined sliding surfaces, reduce the rolling friction of the hoist trolley travel wheels. The reduction of its weights means less movement effort by the operator for manual rotation of the jib crane arm. The new trolleys have the following advantages:
Perfect sliding and maximum silence of the plastic wheels mounted on rolling bearings Connection of loads with pins, joint and without moments High vertical load capacity (horizontally up to 10% of the vertical load)

Upright Designed to permit a wider rotation angle.

Bracket unit Use to fix the wall-mounted crane. The configuration makes it possible to avoid complicated alignment operations during installation.

Column Square column designed to maximise rigidity maintaining a reduced weight.
Trolley High fluidity for a simple movement thanks to the low friction of the wheels.

Electric chain hoist DMK
Fast and suitable for all needs for capacities up to 4,000 kg.

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MAX 1,000 KG
Manual movement

Power supply line Flat cable to reduce maintenance to a minimum.

Arm Lightweight design to move the load simply and quickly.
Electric chain hoist DMK Fast and suitable for all needs for capacities up to 4,000 kg.

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THE MANUALLY ROTATED JIB CRANES WITH ARTICULATED ARM IN THE CBB “COLUMN” SERIES AND THE MBB “WALL” SERIES are designed for the handling of goods inside the plant or a building site where the presence of fixed obstacles would impede the free rotation in terms of the mobility of the arm when it is formed by one rigid element. The cranes “with an articulated arm” are fitted with an arm made of two hinged “pantographshaped” segments which allow it to avoid fixed obstacles during rotation. The standard models are available for capacities from 125 to 500 kg and jibs from 3 to 7 m.
ARTICULATED JIB The jib cranes both in wall and column versions, are fitted with an “articulated arm”, which rotates on its own axis. The articulated arm is made using two cantilevered girders, which form the two hinged segments (semi-arms). The semi-arm on the “tie” side is generally made in boxed casing, while the “cantilever” side can be made using a laminated double T-beam form. The first segment (semi-arm on the tie side) rotates around the axis situated on the column or the bracket where it is fastened. The second segment (semi-arm on the cantilever side) rotates on the ends of the first segment and is fitted with a planarity regulation system. The two semi-arms can be of different lengths and are able to rotate independently of each other. Reciprocal mobility, thanks to the “pantograph” effect, allows the lifting equipment to reach any point in the area to be served, thus avoiding any obstacles to the rotation as well as increasing the surface area served behind the column or the fixing pillar of the bracket. The entire articulated arm is directly integral with, via suitable reinforcements, the rotation tube. The two-rotation arms, rotating on their own rotation axes via bearings, allow the optimal use of the available space at a height due to the absence of staybolts.
ELECTRICAL POWER SUPPLY This powers the hoist and for the connection between the line and the power cable has: Terminal box near the support bracket in the MBB wall version. A main on / off line switch which can be padlocked on the column in the CBB version. The distribution of energy takes place via the fire retardant cable. Electrical line with round multipolar flexible cable inserted on a channel welded under the flange of the jib. Push-button panel hanging from the hoist.

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JIB CRANES WITH ARTICULATED ARM
CBB SERIES
“COLUMN WITH ARTICULATED ARM” SERIES MAXIMUM ROTATION FIELD 360°
MBB SERIES
“WALL WITH ARTICULATED ARM” MAXIMUM ROTATION FIELD 360°

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JIB CRANES WITH MOTORISED ARM
CBE “COLUMN” SERIES
MAXIMUM ROTATION FIELD 300° (290° IN THE T VERSION)
MBE “WALL” SERIES
MAXIMUM ROTATION FIELD 270° (250° IN THE T VERSION)

THE ELECTRICALLY ROTATED JIB CRANES WITH MOTORISED ARM IN THE CBE “COLUMN” SERIES AND THE MBE “WALL” SERIES are designed for handling goods in areas which are difficult to reach, where the presence of fixed obstacles would impede the practicability of the working area. They are used also when the frequency of manoeuvres, the entity of the load and the push forces, could cause excessive wear and tear if carried out manually. Available in standard versions for lifting capacities from 250 to 2,000 kg and jibs from 2 to 8 m. The T and H versions are designed according to the different layouts of the arm.
“T” CANTILEVER VERSION FOR LOADS FROM 500 KG TO 2,000 KG AND JIBS FROM 3 TO 6 M Made using a rolled steel I-beam form: the hoist carrying trolley runs on the lower flanges of the T-beam. The girder is self-supporting and cantilevered, so it has no support staybolts, and it is directly integral with, via suitable reinforcements, the rotation tube. This version allows the optimal use of the available space at a height due to the absence of staybolts and allows the maximum use of the hook run. The arm allows the additional of electrical or mechanical push-trolleys.
“H” OVERBRACED VERSION FOR LIFTING CAPACITIES FROM 250 KG TO 2,000 KG AND JIBS FROM 4 TO 8 M Made using a laminated double T-beam form: the hoist carrying trolley runs on the lower flange of the T-beam. The arm is fitted with one or two staybolts to support the profile which connect it to the rotation tube. This version allows the use of the jib crane for lifting capacities and ranges superior to those of the T version. The arm allows the additional of electrical or mechanical push-trolleys.
ROTATING ARM The arm, rotating around its own axis on rolling bearings, consists of a supporting girder for the run of the hoist carrying trolley.
THE ROTATION MECHANISM Formed by a motor reducer fixed vertically in the lower part of the support bracket, made with a reducer of epicyclical type, with gears in a thermally treated oil bath and self-braking conical brake motor. The drive sprocket of the motor reducer fits together with the toothed crown integral with the arm which it powers. The progressive starting up and braking are ensured by a frequency variator (inverter) powered by alternate monophase 230V voltage. A three phase inverter is needed to supply cranes other than 400 V.

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ELECTRICAL POWER SUPPLY To power the hoist and trolley, which run along the jib of the crane as well as the rotation motor reducerThe power supply includes two electrical control panels, one for the control of the lifting and travel unit of the hoist, while the rotation control equipment is integrated with the motor reducer. Inside the panels the contactors for the control of all of the movements of the crane are positioned. The control circuits are low voltage (48V) obtained via a transformer protected by fuses. An easy-to-use connection terminal box, with numbered terminals, ensures simplicity and safety of the wiring of the cables related to all the external functions making any inspections easy to perform. The power line to power the trolley-hoist formed by flexible flat fire-retardant multipolar cables festooned on the sliding trolleys on the lower flange of the beam. The push-button control panel, suspended on the hoist, with a shockproof thermoplastic case, supported by a round multipolar cable and suspended with specific ropes. When necessary it is fitted with a rapid socket with obliged polarity to make it easier to assemble and replace. On request an independent, sliding, pushbutton panel can be installed along the jib of the crane, via cable-carrying trolleys inside a channel profile via multipolar cable with festoons. Acoustic alarm, when included, controlled by an “alarm” button serves the function of acoustic warning to indicate any dangerous situations during handling. Electric safety limit switch on the rotation movements, installed as standard to delineate the rotation field of the arm of the crane. Working on the auxiliary circuits at low voltage, two thresholds of intervention both in right rotation and left, also carry out the emergency function in safety if there is any fault or malfunctioning of the first threshold of intervention. For the connections to the line, there are:
a main on/off switch on the jib crane which can be padlocked a connector block on the bracket crane. Powered by alternate electric power with three-phase voltage + neutral + earth (~ 3+N+T).

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360° ELECTRICALLY ROTATED JIB CRANES GBR “COLUMN” SERIES

GBR “COLUMN” SERIES
ROTATION FIELD 360° CONTINUOUS ROTATION

THE GBR SERIES ELECTRICALLY ROTATED JIB CRANES Are used to handle loads whose mass (high or bulky) does not allow manual handling. They are also used when fixed obstacles impede the practicability of the working surface. They are the ideal solution for handling:
in outdoor squares and deposits on harfs, to load and unload materials for watercraft on harfs to haul boats on loading ramps, for handling materials for lorries for services of big operating units or assembling machines Available as standard for lifting loads from 1,000 to 10,000 Kg and jibs from 4 to 10.5 m.
COLUMN Made of press-forged steel sheet welded to the tubular structure with octagonal section it allows a high rigidity and stability; it is fixed with a base plate and a system of bolts or lug bolts. The upper part is fitted with a flange for fixing the rotation thrust bearing.
ROTATING ARM This is formed by a supporting girder and, in relation to the lifting capacity and/or the jib length, can be made rolled steel I-beam form or box beam designed to guarantee the maximum flexotorsional stability. In the construction of the supporting box beam high quality section steel is used and welded carried out with continuous line procedure to ensure optimal safety conditions and operative reliability of the crane. It is fitted with a flange with holes for the application of the thrust bearing to which it is fixed using high resistance bolts. The rotation of the arm of the crane, which is mounted on a rotating thrust bearing, is ensured via

a motoreducer. The circular area served by the arm can, according to necessity, be limited by electrical limit switches, or allow continual rotations, without end, of the arm itself in both directions by a collector ring.
ROTATION MECHANISMS Base bearing or thrust bearing, able to support both axial pushes, due to vertical forces and the tilting momentum due to the movement.
MOTOREDUCER fitted on the arm, fitted with a selfbraking motor with progressive start-up and braking where the sprocket, keyed on the slow shaft, fits together with the internal toothing of the thrust bearing to which it gives movement.
FIXING SYSTEM The foundation frame with lug bolts is supplied, on request, for fixing the column to the base (foundation plinth).
ELECTRICAL POWER SUPPLY Made for powering the hoist and trolley which run along the arm of the crane as well as to power the rotation motoreducer and includes two electrical control panels, one to control lifting and movement unit on the trolley/hoist, while the control apparatus of the rotation motoreducer is integral with the arm. Inside the panels there are the contactors for the control of all of the movements, as well as protection fuses against short circuits. The control circuits are low voltage obtained via a transformer protected by fuses. A connection terminal box, with numbered terminals, ensures simplicity and safety of the wiring of the cables relative to all the external functions making any inspection

easy to perform. Alternatively, on request, the crane can be supplied with one electrical panel only made of press-forged sheet, which contains the contactors and the timers to control all the movements of the crane, as well as protection fuses against short circuits. The control circuits are low voltage. A connection terminal box ensures simplicity and safety of the wiring of the cables related to all the external functions making any inspections easy to perform. The electrical line to power the trolley-hoist formed by flexible flat fireretardant multipolar cables festooned on the trolleys which slide inside a channel section. A hanging pushbutton control panel, with shockproof thermoplastic casing, sliding, along the crane girder, via trolleys inside a channel section using festooned flexible multipolar cable. It is supported by a round multipolar cable and

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suspended by specific ropes. It is generally fitted with a rapid socket with obliged polarity to make it easier to assemble and replace. Acoustic alarm, when included, controlled by an “alarm” button serves the function of acoustic warning to indicate any dangerous situations during handling. Rotating collector ring installed when the arm of the crane is free from obstacles in every point of its rotation and the arm itself is required to rotate continuously in both directions. Electric safety limit switch on the rotation movements, installed to delineate the rotation field of the arm of the crane. Acting on the auxiliary circuits at low voltage, two thresholds of intervention both in right rotation and left, also carry out the emergency function in safety if there is any fault or malfunctioning of the first threshold of intervention.

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ELECTRICALLY AND MANUALLY ROTATED JIB CRANES 360°
GBL “COLUMN” SERIES
360° ROTATION WITH CONTINUOUS ROTATION

THE GBL SERIES ELECTRICALLY OR MANUALLY ROTATED JIB CRANES Are the ideal solution for handling loads in internal environments. Available as standard for lifting loads from itself 1,000 to 5,000 kg and jibs from 4 to 8 m with electrical rotation and up to 2,000 kg with manual rotation.
COLUMN Made of press-forged steel sheet welded to the tubular structure with octagonal section it allows a high rigidity and stability; it is fixed with a base plate and a system of lug bolts. The upper part is equipped with a flange for fixing the sprocket (for electrical rotation of the arm) and ball bearing for centring and rotation of the arm on the column and a rolling track.
ROTATING ARM This is formed by a supporting girder made in rolled steel I-beam, a centring pin on the vertical axis of the column and a reaction arm with roller box which slide on the rolling track of the column. The electrical rotation of the crane arm is ensured by a motoreducer which is connected to the arm. The circular area served by the arm can, according to necessity, be limited by electrical limit switches, or allows continual rotations in both directions through the use of a rotating collector ring.
ROTATION MECHANISMS Composed of a motoreducer fitted on the arm, fitted with a self-braking motor with progressive start-up and braking where the sprocket, keyed on the slow shaft, fits together with the external toothing of the crown attached to the column.
FIXING SYSTEM The foundation frame with lug bolts is supplied, on request, for fixing the column to the base (foundation plinth). For cranes with capacity up to 2,000 kg and jig up to 8 m, the fixing may also be done with the use of chemical bolts and specific counterplate.

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ELECTRICAL POWER SUPPLY Made for powering the hoist and trolley which run along the arm of the crane as well as to power the rotation motoreducer and includes two electrical control panels, one to control lifting and movement unit on the hoist/trolley, while the control apparatus of the rotation motoreducer is integral with the arm. Inside the panels there are the contactors for the control of all of the movements, as well as protection fuses against short circuits. The control circuits are low voltage obtained via a transformer protected by fuses. A connection terminal box, with numbered terminals, ensures simplicity and safety of the wiring of the cables related to all the external functions making any inspections easy to perform. The electrical line to power the trolley-hoist formed by flexible flat fire-retardant multipolar cables festooned on the trolleys which slide inside a channel section. Push-button panel hanging from the hoist/ trolley control equipment. It is supported by a round multipolar cable and suspended by specific ropes. Remote control when requested as an alternative to the traditional push-button panel, in cases of bulky loads in order to remotely control all movements. Acoustic alarm, controlled by an “alarm” button serves the function of acoustic warning to indicate any dangerous situations during handling. Rotating collector ring installed when the arm of the crane is free from obstacles in every point of its rotation and the arm itself is required to rotate continuously in both directions. Electric safety limit switch on the rotation movements, when requested, installed to delineate the rotation field of the arm of the crane. Acting on the low voltage auxiliary circuits, it has two thresholds of intervention both in right rotation and left, also carry out the emergency function in safety if there is any fault or malfunctioning of the first threshold of intervention.

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Manual And Electric Jib Cranes