There are numerous things to think about when using chain slings for more complicated lifts, here's some information regarding these special applications.

CLAMPING FORCE:

Multi leg chain slings create a "clamping force" or a compressive force about the load, this increases when the  angle is enlarged. This force is also increased within the kind of sling where the hooks are threaded on a loop chain. The slinger must take note of this force and utilize it to his advantage, and avoid the hazards which it could cause. For instance, with this shape load (see diag) the clamping force is utilised to good effect making sure the hooks are clamped tightly on the load.

Various cases have arisen whereby the load has not been rigid enough to withstand the clamping pressure. The slinger should take steps to reduce the clamping force in the case of crushable loads, e.g. lightweight frames.

COMBINATION SLINGS:

Steel joists and concrete beams etc. may be lifted using a 2 leg sling in a choke hitch but when the task is  repetitive it can be more desirable to utilize 2 short reevable collar slings together with a 2 leg sling as shown. The reevable collar slings are simpler to move about under the load and are less expensive to exchange when worn.

Whenever you use combination slings they have to both have identical sized chain.The whole combination must be treated as a 2 leg sling in a choke hitch.

Large packing boxes and similar shaped loads may be handled by a double basket sling but a better way is to utilize a 4 leg sling together with 2 reevable collar slings ensuring the chain size is identical, this mix may be rated as a double basket sling.

OFF BALANCE LOADS:

There are some loads which are asymmetrical and will not balance at their centre of gravity, and so tilting takes place. If the form of the load permits the sling needs to be placed equally about the centre of gravity to ensure a safe horizontal lift. An experianced slinger will be able to estimate the centre of gravity and therefore know where to position the slings.

If An off balance load is fitted with a sling, attached in a way so that the crane hook is not directly above the centre of gravity the load will tilt until the centre of gravity is directly below the crane hook. In this instance the sling leg nearer the heavy end is going to be withstanding a bigger force than the leg at the lighter end. This situation may well become increasingly more extreme until one leg is supporting the nearly all the load while the 2nd leg is merely steadying the load.

As a result of varying shapes and sizes of loads it's impossible to provide precise guidance in lifting these loads, however the slinger should be aware that whilst handling an off balance load the leg on the tilted heavier end may be supporting up to 100% of the weight of the load, therefore the sling needs to be chosen that is capable of supporting the weight on one leg.

• Ensure the crane or hoist’s hook is suitable for the magnet and the SWL is appropriate.
• A load suspended with a lifting magnet should not be left unattended for long.
• Test / trial lifts should always be carried out to ensure the hold is secure.
• When more than one lifting magnets are used together to lift larger objects then a spreader beam should be used for stability.
• Ensure the surface of the steel is in good condition to prevent air gaps.
• Never lift or move loads whilst people are in the area of movement.
• Never magnetize the magnet lifter (by locking the handle down) without a load.
• Never de-magnetize the device (by raising the handle) until the load has been completely set down.
• If lifting round objects like pipes the lifting capacity will be reduced as full contact will not be made.
• NEVER use a magnet lifter around medical equipment, pacemakers and/or insulin pumps, as the magnetic force can cause the equipment to fail.

A lifting magnet should be inspected and serviced at least every 12 months to confirm its safety for use, however a visual check should be made by the operator prior to each use to check for defects such as cracked housing, broken handl
es, damaged suspension eyes and that it is clean and clear of dust and debris.

Here is some information regarding 2,3 & 4 leg chain slings, calculating working load limits in various hitch types and methods of use.

2 LEG SLINGS:

2 leg slings can be utilized in many different hitches, straight, choke, basket, drum and 2 leg with just one leg utilised. Here's the diagrams of how they are normally used in addition to there respective working load limit (WLL)

1, STRAIGHT LIFT; In normal circumstances the WLL is going to be as for a two leg sling.

2, CHOKE HITCH: The WLL must be not more than 80% of the WLL for a 2 leg sling.

3, BASKET HITCH: This should be rated as a 2 leg sling. The angle of any leg shouldn't exceed 45 degrees from the vertical axis. (this sort assumes the looks of a 4 leg sling however it needs to be noted that the master link will probably be suitable for 2 leg loads only and so the sling therefore, be rated as a 2 leg.)

4, DRUM SLING: Must be rated as a single sling. (With this configuration the included angle needs to be maintained as close as possible to 60 degrees (30 degrees from vertical). If then drums of various lengths are lifted a shortening clutch needs to be attached so that the length of chain may be adjusted to keep this angle).

5, TWO LEG SLING; WITH ONLY ONE LEG USED: This should be rated at half the working load marked on the sling, the WLL needs to be not more than 80% if utilised in choke hitch. ( two leg slings with just one leg in use must make certain that the unused leg is hooked back out of harms way.)

 TWO SINGLE LEG SLINGS USED TOGETHER:

2 single leg slings really should not be used together to create a pair unless:

They are the identical type, grade, size and length. 

 They are both marked with the same WLL rating

   The included angle between the two legs will not exceed 90 degrees or 45 degrees from vertical

    The crane hook is big enough to comfortably receive both upper terminal fittings of the sling.

1, STRAIGHT LIFT: WLL should be rated as a 2 leg sling. The WLL, as a result will be the same as a similar 2 leg sling.

2, CHOKE HITCH: The WLL must be not more than 80% of the WLL for a 2 leg sling.

3, BASKET HITCH: Should be rated as a 2 leg sling. The WLL must be not more than the equivalent 2 leg sling.

3- LEG SLINGS:

STRAIGHT LIFT:  under ordinary conditions the WLL would be the same as for 3-leg slings.

CHOKE HITCH: The WLL must be not more than 80% of the WLL for a 3-leg sling.(Rate as indicated only in cases where the load appears to be reasonably equally distributed between all 3-legs. If 2 are supporting the majority of the load, rate at 2/3 of the marked WLL.)

4-LEG SLINGS:

STRAIGHT LIFT:  Under normal conditions the WLL is going to be as for the WLL for 4-leg slings

CHOKE HITCH: The WLL must be not more than 80% of the WLL for a 4-leg sling.

DOUBLE BASKET SLING: This should be rated like a 4-leg. ( This WLL applies to double basket slings designed as such and fitted with a master assembly strong enough for this duty. It doesn't apply to a back-hooked 2-leg sling. The maximum included angle should be 90 degrees  measured between the diagonally opposite legs or max 45 degrees from vertical.)

TWO 2-LEG SLINGS USED AS A 4-LEG: The WLL must be not more than that applicable to an equivalent 4-leg sling.

THE YLS and YFS models;

Single acting hydraulic cylinders,   low height and flat cylinders models.

Single acting with spring return, 10-100 tonnes

THE KEY FEATURES INCLUDE;

Highest operating pressure- 700 bar

Low height intended for confined working places

The cylinder and the body are produced from huge chromium molybdenum steel and  heat treated

Single acting together with spring return

Oil port thread: 3/8 NPT

Incl. Female coupler half model CFY-1

the stop ring be able to tolerate full pressure and is fitted with a dirt wiper

Model YLS-100/55 is pre-loaded with 2 lifting rings

Model YFS- 100/15 is included with a carrying handle

The applications and benefits of utilising hydraulic cylinders are as follows;

These compact hydraulic cylinders  both  low height and flat are recommended for most lifting applications and can also be used for pushing, levelling and pressing purposes especially useful in confined spaces.

They are made for lifting and positioning jobs in addition to all general maintenance operations, where low height, portability, and light weight devices are considered necessary.

These incredibly versatile cylinders are found in many industrial areas like steel, civil engineering, construction industry, power plants and off-shore industries.

Flat cylinders, owing to their short strokes, shouldn't be subjected to side loading.

A beam clamp is a device from which a load is hung;  the beam clamp is attached to the flange of a steel beam without altering the beam in any way. Beam clamps offer a safe and fast semi-permanent lifting point, they are lightweight and easy to install with a secure grip. Beam clamps are ideal for use along with manual chain blocks, lever hoists and pulling machines etc.

Beam clamps are available in a range of capacities and designs, they can be adjustable or of a fixed size, can have scissor action, screw locking or bolt clamp fixings.

Good beam clamps offer: - Robust all steel construction,   they are easy to install,      the built in suspension bar offers low headroom, making them ideal where headroom is at a premium.  Beam clamps are compact and lightweight,   they also provide a safe and secure grip due to the central threaded spindle; and super quick adjustment to any girder width within its range.

There are beam clamps available which suit various sizes of beams, and some come supplied with a shackle attached, providing an even more versatile rigging point allowing for the easy attachment of hoisting equipment such as electric hoists, and chain blocks. Most beam clamps have a locking device for additional safety, and there are various models available which have extra reinforced side plates and jaws for use in demanding conditions. Beam clamps are available in varying capacities, and the safe working load should never be exceeded.

The mobile gantry is positioned directly over the object which needs to be lifted, and made stable by locking the castors and/or applying parking jacks. Then by using a lifting device attached to the gantry's beam via a beam clamp or trolley, the load may be attached. Lifting devices frequently used are electric hoists, manual hoists, ratchet lever hoists and magnet lifters.

 Loads are often attached to the lifting device by using some form of sling,  either a chain sling or web sling depending on the size and type of load. Once the load is attached it is good practice to perform a test lift by slowly lifting the load slightly off the ground and checking that it is held securely and is well balanced, an out of balance load is dangerous and could cause the gantry to tip, likewise if you try to move a gantry whilst under load. Once you are confidant all is safe and balanced you may proceed with the complete lift.

It is most important as with all lifting gear products to check them frequently, looking for any flaws which could seriously impede its lifting capabilities and safety. You should look for cracking in welded joints, deformed or dented beams, loose bolts, debris on the runway etc. And of course you should also check other lifting devices in the same way. If there is any doubt over the safety of the device then get it inspected and tested by a competent engineer before use.

Additional safety tips to ensure safety whilst using a mobile lifting gantry include ensuring the lifting area is clear of all persons and objects, the floor should be level and clear and always apply parking brakes or jacks. The safe working load of the gantry should never be exceeded, and loads should never be dragged or swung whilst raised, also you should never climb on a gantry.

Following these simple procedures will enhance the safety of the device.

HYDRAULIC RETURN (5-200TONNE)

These tremendously tough hydraulic cylinders are particularly created for heavy duty lifting operations, in addition to industrial production and assembly jobs. The key areas of use are ship building, civil engineering, and bridge building in addition to being used as the power source in frame presses, stamping fixtures plus other industrial uses where high pushing and pulling forces are required.

Some of the main features incorporate:

Robust, double acting cylinders

High pulling & pushing forces

Hydraulic return

Rapid piston retraction speed

Long bronze piston guiding

Double bronze bearing or the hard chromium plated piston

Metric mounting threads on cylinder housing

Max. Operating pressure 700 bar

Piston and cylinder body produced from chromium-molybdenum steel and heat treated

Dirt wiper

2 female coupler halves model CFY-1

Lifting rings or carry handles are included and vary between models.

The beam clamps safety will be mainly governed by the requirements for the lifting device with which it will be utilised but the following do’s and don’ts  must always be followed.

ALWAYS;

• Store and handle with care
• Inspect prior to each use for defects
• Check the beam is adequate for the load and the clamp is fixed securely
• Ensure the beam clamp has the correct capacity rating for the load intended
• Ensure the beam clamp is directly above the loads centre of gravity.
• If 2 clamps are used together a spreader beam may be needed, to ensure that neither clamp exceeds the SWL.

NEVER;

• Use unidentifiable or uncertified clamps
• Use on distorted or damaged beams
• Exceed the safe working load
• Replace any bolts or shackles without consulting the supplier
• Obliquely load the clamp
• Force the hooks of devices into the shackle or other anchor point device
• Drop a beam clamp
• Use a defective clamp

A beam clamp is a piece of lifting gear from which a load is hung; A beam clamp is fixed on the projection/flange of the steel beam without changing the beam in any manner.

Beam clamps offer a number of safe and speedy semi-permanent lifting / rigging points, often used on our a-frames, cranes and gantry systems, and are perfect to be used  with manual chain blocks, wire rope pulling machines, lever hoists,electric hoists etc. 

Beam clamps present the following attributes; 

Sturdy  all round steel design

Simple to set up

The inbuilt suspension bar provides low headroom

Compact and lightweight.

Safe and secure grip

Extremely fast adjustment to any girder within its range.

Below is some information on 3 of our most popular versions that we provide , if you would like any more facts or specifications,  Please get in touch with us.

YC STANDARD BEAM CLAMP capacities 1000-10000kg)

The YC clamp offers a speedy rigging place intended for your hoisting gear, pulley blocks or loads.

Tremendously versatile and flexible as a result of the wide adjustment choice.

The middle threaded spindle makes it possible for for simple attachment and a safe and secure grip.

Arrives inclusive of a locking mechanism.

YC-S BEAM CLAMP Including SHACKLE (capacities 1000-5000kg) 

The YC-S beam clamp presents a rapid and adaptable rigging point for hoisting gear, blocks or loads

The additional shackle permits for the suspension of larger hooks and slings etc.

Comes complete with a locking device.

 Adaptable function because of the wide adjustment range.

Central threaded spindle makes it possible for for straightforward attachment and a safe and secure grip.

YRC REINFORCED BEAM CLAMPS (capacities 1000-10000kg)

This is the newly designed variety of reinforced beam clamps

The YCR clamps contain all the conventional top features of the YC range of clamps

Together with the additional advantage of the reinforced side plates and jaws, ensuring the clamp is extremely robust and tough.

This design alteration makes them a  very safe attachment point even under demanding circumstances.

Can be utilized as a horizontal rigging point or else as a lifting clamp.

The Vego or CPV/F models are available in capacities ranging from 125kg up to 2000kgs.

The design of the Vego utilizes modern design and technology and provides a robust and versatile piece of lifting gear, suitable for many industrial applications. This hoist has upper and lower limit switches which considerably extends the working life of not only the slip clutch but also the gearbox and motor. The design also leads to much increased safety and reduced maintenance time.

This electric hoist has an easily removable housing cover which allows direct access to the electrical connections, the enclosed design however protects the electrical components, especially the load brake from any contamination to level IP55.

The slip clutch is adjustable externally  and has been designed to guarantee a permanent connection between the load and the brake, even in the event of extreme overload.

The helical gearing provides a very low noise level yet longer service life. The chain guide along with the load wheel are able to be disassembled easy and quick, reducing down time. There is direct access to the chain end anchor for double chain fall hoists.

This electric hoist has easy access to all wearing parts for easy maintenance and servicing, yet its cover provides high impact resistance due to its polyamide construction.

OTHER MAIN FEATURES INCLUDE

• i) Load sprocket also chain guide may be easily inspected, no disassembly of unit needed.
• ii) Mainline contactor for increased safety
• iii) Duty cycle 50% ED for single speed
• iv) Designed to FEM 1 Am
• v) Electromagnetic spring pressure brake holds load safely, even if power fails
• vi) Standard voltage of 400v, 3ph, 50Hz
• vii) Increased safety through 42v low volt control with enclosed pendant control to IP 65
• viii) There is a suspension lug as standard for reduced headroom and also easy integration into trolley operations.

OPTIONAL EXTRAS AVAILABLE ARE;

• Manual & electric trolleys
• Suspension hook
• Festooned cable system
• Stainless steel load chain
• Radio remote control
• Thermal overload
• Other operating voltages

Builders and scaffolders will almost certainly know how utilising scaffold hoist will be advantageous in many ways, if you don't know or would like to know more about these hoists then this informative article offers that information. 

A scaffold hoist, also known as a builders hoist, is an electrically powered device which can be used for raising and lowering objects, mostly up and down a scaffold tower. The hoist is often fixed to the scaffolding pole using a secure clamp, a number of designs simply hook over the pole and others could possibly be attached to a prop. This device can be easily positioned wherever needed thus a really adaptable appliance. These scaffold hoists are mainly utilised inside the building industry and related areas by builders and roofers, and tend to be obtainable with a variety of lengths of wire rope to suit the height of lift that you need. A variety of lift speeds may also be found dependent upon the version. 

The majority of building/construction work will require carrying tools and materials up to varying heights, often within a scaffold tower. Employees who carry objects up a scaffold system take great risk, scaffolds are hazardous to climb at the best of times, and are even more dangerous when carrying objects. Injuries and accidents are common, nevertheless the danger could be massively lowered by using a scaffold hoist  to speedily raise up your loads to where required.

 The accessories that can be found for use with the scaffold hoist offer immense benefits. They enable specific items to be lifted with the hoist to wherever required; the accessories comprise buckets for mortar, chutes to carry waste to a skip below, chains to lift a loaded wheelbarrow in its entirety as well as chains for lifting smaller skips. 

It's cost effectiveness is a major benefit, now we are going to reflect on how.

 Countless construction buisnesses quote jobs based on the time it should take, longer builds will cost more. Since a builder's hoist is electrically powered it will raise and lower loads pretty quick, as compared to an individual hauling loads precariously up and down a dangerous scaffold tower. Time off work for accidents and injuries are not uncommon, frequently caused by lifting heavy loads, more so when awkwardly hauling them up a scaffold; Back and knee injuries are well known amongst builders, yet the strain on the human skeleton may be minimised by the use of a builder's scaffold hoist, consequently resulting in less time off work for injuries, no reduction in manpower and consequently no time lost on the job.

 We are able to conclude from the above talked about benefits that using a scaffold hoist provides a safe, fast and so cost efficient way to lift and lower loads throughout a scaffold tower.

Manual chain hoists are also commonly known as; chain blocks, block and tackle, hand chain hoists or manual hoists.

Hand chain hoists provide an extremely versatile method of lifting heavy loads with great precision, chain blocks are portable and cost efficient and are extremely useful in areas where there isn't any electric supply,  or where using electric could possibly be hazardous, e.g. chemical plants. Manual chain hoists are frequently utilised in workshops, factories and many other types of industry.

A hand/manual chain hoist is attached to an appropriate fixing point with its top hook,usually a beam, jib crane or gantry system, the load is then attached on the lower hook, The operator will then pull down on one of the chains which then turns over 2 different sized gears, this will multiplies the force, this then raises the other side of the chain to which the load is fitted.

 Hand chain hoists usually have a brake system to then hold the load in position, whilst manoeuvring to its final resting place. Some can also have an overload prevention device fitted for extra safety, chain blocks may also be supplied with a chain bucket which can be extremely useful, as they not only keep the surplus chain out of the way, and stop people from tripping, they also protect the chain from damage.

When using hand/manual chain hoists safety is a top concern, next time we are going to discuss the primary safety aspects to think about when using these hoists.

A chain block may also be referred to as a manual chain hoist, hand chain hoist or block and tackle. They are manually activated devices to aid in lifting heavy loads.

Basically a chain block works by attaching a load, and subsequently pulling down on one of the chains, the chain runs over a gear to raise the load, this increases the mechanical work being carried out by the gear ratio inside the devices housing.

Chain blocks are available in various forms with differing lifting capacities; Lifting Gear Direct can supply various models with capacities from 500kg up to 20’000kgs. Some varieties of these chain blocks come with an integrated trolley for convenience, and there is also the popular 360 degree chain block which allows full rotation to enable the user to work in nearly all positions, even above the load.

Chain blocks have a brake system to allow the load to be held in a raised position, most also have an overload prevention system for extra safety sometimes this may be an optional extra; other extras available are chain buckets, which keep the excess chain tidy and out of the way.

A chain block provides a convenient and versatile method to lift heavy loads; they are quick to fit, portable and cost effective, they are extremely useful for finer, accurate control of the load. Chain blocks are frequently seen being utilized in many areas such as workshops, and anywhere that using an electric hoist isn’t suitable due to lack of power supply or because of hazardous environments.

Nevertheless here we have listed for you a number of essential principals in safe slinging including malpractices to  avoid, and we have also included a diagram for the restrictions on the angle of use.

EVALUATING THE LOAD

The user should take practical steps to ascertain the weight of the load, guessing just isn't satisfactory. Drawings might be available providing the weight or it might be calculable with reasonable accuracy. If the load is probably going to be lifted again the weight ought to be marked on it.

 LOAD STABILITY

Good slingers will develop the practice of assessing uncommon loads and estimating the centre of gravity after which you can attach the sling in such a way that the centre of gravity is directly below the lifting points, or else if this technique is impossible, well within them. The load needs to be slowly lifted off the ground, and if the load tilts the chain sling must be adjusted to a more even position.

 SHOCK LOADING

Crane drivers and slingers need to be conscious of shock loading. High acceleration forces, or shock loads, could be brought on by sudden operation of the crane by not taking up the slack before beginning to lift, or else by abrupt collision of falling objects. Shock loads may break a chain despite the fact that the weight of the load is well under the working load limit for that chain. Lifting and lowering must always be done slowly.

 LANDING THE LOAD

Before a load is lifted, an area needs to be arranged where it is to be put down. The majority of loads will be lowered onto wood battens, so that the chain sling may be easily removed. The load must on no account be landed directly onto the chain.

 TIP LIFTING OF HOOKS

Hooks are intended to support the load within the bowl of the hook never on its tip. Users must always guarantee that the hook of a sling engages freely in the lifting point so the weight of the load is supported inside the bowl. Forcing or wedging the hook tip into the lifting points leads to the hook being stressed which can result in failure. 

 KNOTTING, TWISTING AND TRANVERSE BENDING OF CHAIN

Chain that is twisted, or even worse, knotted , can't develop its full strength and will  surely fail. Chain is intended to support the load in a straight line of force running directly through the crowns of each link. Therefore twists must be removed prior to use and knotted chain must on no account be used. Chain that is bent under tension across a sharp corner is stressed in such a way that it isn't designed for. Timber or other suitable packing material needs to be used to avoid this kind of stressing.

 MISUSE OF SHORTENING CLUTCHES

The chain which carries the load must ALWAYS lead from the underside of the clutch. If ever the direction is reversed so that the load carrying chain leads from the top of the clutch, the front portion of the clutch could possibly be pulled off and the load released, causing possible injury.

 BATTENING DOWN

On occasion it can be alleged that a choke hitch may be made secure by striking the hook, link or adjacent chain in an effort to force the bight into closer contact with the load. This technique is serious malpractice (referred to as battening down) and is dangerous, the bight must be allowed to take on its natural angle which will be approximately 120 degrees.

 TAG LINES

When elongated loads  are to be lifted, particularly in confined places, slingers should fasten a rope or tag line to at least one or both ends of the load in order that any rotational movement may be controlled and corrected quickly.

 HOOKING BACK UNUSED LEGS

In the case of multi-leg chain slings when not all legs are in use, the unused leg must always be hooked back by means of engaging the hook within the master link or the master assembly.

 CODE OF SIGNALS

Slingers and drivers must always use an agreed code of signals prior to lifting any load. An agreement must be made in order that just one slinger is in command of giving the signals, all other signals will be ignored except for the emergency stop signal which must always be acted upon.

SLINGERS DUTY OF PROTECTION

Slingers ought to wear appropriate garments, and at the instant the strain is taken on the chain sling, the slingers hands and feet must be away from the load, after which position himself to ensure that he doesn't risk injury if the load was to fail and fall.

   SLING STOWAGE

Chain slings ought to be removed from crane hooks and stored in an appropriately designed rack, they should in no way be left lying on the floor where they could suffer damage.

CHAIN SLINGS.......RESTRICTIONS ON THE ANGLE OF USE:

All multi-leg chain slings apply a horizontal component of force, that  raises as the angle from the vertical gets greater.

NO chain sling should be used if ever the angle from the vertical is greater than 60 degrees, since beyond this point the forces in the legs drastically increases.

Angles of lower than 15 degrees must be avoided since these can lead to the load becoming unstable.

DO NOT USE MULTI-LEG CHAIN SLINGS AT ANGLES WITHIN THE SHADED AREA OF THE DIAGRAM BELOW.

A lifting gantry is used to assist in the lifting and moving of loads which are too heavy or cumbersome for individuals alone. The gantry is a framework of steel, typically 2 "A" shaped end frames with a "H" beam across the top, it is to this beam that additional lifting devices are attached; typically a beam clamp or trolley for attaching and/or moving the lifting device and load across the beam; the lifting devices often used are an electric hoist or chain block, these are the devices that actually lift the load, the lifting gantry itself is merely the supporting system.

A lifting gantry is a versatile piece of lifting gear due to the fact that it is moveable, unlike a fixed overhead crane; this enables smaller working areas to have that extra lifting capability that simply wouldn't have the room or necessity for a fixed crane. The mobile lifting gantry can be easily positioned where necessary, due to its castors, 2 of which should be lockable to provide stability.

It should be noted that a mobile lifting gantry should never be moved whilst under load.

The YCH model incorporates hydraulic return, and is available from 33-140 tonne

These double acting cylinders are normally used, where the piston  is needed to be retracted rapidly e.g. with high-cycle pulling operations.

The fundamental operations are identical as #for the# single acting cylinders shown before, but regarding the double acting models the piston return is done hydraulically by the use of another oil port.

THE CORE FEATURES OF THE ych DOUBLE ACTING CYLINDER ARE:

operating pressure max. 700 bar

double acting with hydraulic return

large centre diameter hole

cylinder body and piston made from immense chromium-molybdenum steel as well as heat treated

hard chromium plated piston plus replaceable / interchangeable hardened heat treated saddle

stop ring to avert over-travel of piston

inner and outer dirt wipers

oil port thread 3/8 npt

incl. 2 female coupler halves model cfy-1

all with carry handle 9from ych 62/250 with 2 lifting rings)

metric mounting threads

Nevertheless here we have listed for you a number of essential principals in safe slinging including malpractices to  avoid, and we have also included a diagram for the restrictions on the angle of use.

EVALUATING THE LOAD

The user should take practical steps to ascertain the weight of the load, guessing just isn't satisfactory. Drawings might be available providing the weight or it might be calculable with reasonable accuracy. If the load is probably going to be lifted again the weight ought to be marked on it.

 LOAD STABILITY

Good slingers will develop the practice of assessing uncommon loads and estimating the centre of gravity after which you can attach the sling in such a way that the centre of gravity is directly below the lifting points, or else if this technique is impossible, well within them. The load needs to be slowly lifted off the ground, and if the load tilts the chain sling must be adjusted to a more even position.

 SHOCK LOADING

Crane drivers and slingers need to be conscious of shock loading. High acceleration forces, or shock loads, could be brought on by sudden operation of the crane by not taking up the slack before beginning to lift, or else by abrupt collision of falling objects. Shock loads may break a chain despite the fact that the weight of the load is well under the working load limit for that chain. Lifting and lowering must always be done slowly.

 LANDING THE LOAD

Before a load is lifted, an area needs to be arranged where it is to be put down. The majority of loads will be lowered onto wood battens, so that the chain sling may be easily removed. The load must on no account be landed directly onto the chain.

 TIP LIFTING OF HOOKS

Hooks are intended to support the load within the bowl of the hook never on its tip. Users must always guarantee that the hook of a sling engages freely in the lifting point so the weight of the load is supported inside the bowl. Forcing or wedging the hook tip into the lifting points leads to the hook being stressed which can result in failure. 

 KNOTTING, TWISTING AND TRANVERSE BENDING OF CHAIN

Chain that is twisted, or even worse, knotted , can't develop its full strength and will  surely fail. Chain is intended to support the load in a straight line of force running directly through the crowns of each link. Therefore twists must be removed prior to use and knotted chain must on no account be used. Chain that is bent under tension across a sharp corner is stressed in such a way that it isn't designed for. Timber or other suitable packing material needs to be used to avoid this kind of stressing.

 MISUSE OF SHORTENING CLUTCHES

The chain which carries the load must ALWAYS lead from the underside of the clutch. If ever the direction is reversed so that the load carrying chain leads from the top of the clutch, the front portion of the clutch could possibly be pulled off and the load released, causing possible injury.

 BATTENING DOWN

On occasion it can be alleged that a choke hitch may be made secure by striking the hook, link or adjacent chain in an effort to force the bight into closer contact with the load. This technique is serious malpractice (referred to as battening down) and is dangerous, the bight must be allowed to take on its natural angle which will be approximately 120 degrees.

 TAG LINES

When elongated loads  are to be lifted, particularly in confined places, slingers should fasten a rope or tag line to at least one or both ends of the load in order that any rotational movement may be controlled and corrected quickly.

 HOOKING BACK UNUSED LEGS

In the case of multi-leg chain slings when not all legs are in use, the unused leg must always be hooked back by means of engaging the hook within the master link or the master assembly.

 CODE OF SIGNALS

Slingers and drivers must always use an agreed code of signals prior to lifting any load. An agreement must be made in order that just one slinger is in command of giving the signals, all other signals will be ignored except for the emergency stop signal which must always be acted upon.

SLINGERS DUTY OF PROTECTION

Slingers ought to wear appropriate garments, and at the instant the strain is taken on the chain sling, the slingers hands and feet must be away from the load, after which position himself to ensure that he doesn't risk injury if the load was to fail and fall.

   SLING STOWAGE

Chain slings ought to be removed from crane hooks and stored in an appropriately designed rack, they should in no way be left lying on the floor where they could suffer damage.

CHAIN SLINGS.......RESTRICTIONS ON THE ANGLE OF USE:

All multi-leg chain slings apply a horizontal component of force, that  raises as the angle from the vertical gets greater.

NO chain sling should be used if ever the angle from the vertical is greater than 60 degrees, since beyond this point the forces in the legs drastically increases.

Angles of lower than 15 degrees must be avoided since these can lead to the load becoming unstable.

DO NOT USE MULTI-LEG CHAIN SLINGS AT ANGLES WITHIN THE SHADED AREA OF THE DIAGRAM BELOW.

A beam clamp does exactly what its name implies, it is a clamp which fixes onto a beam, generally on a crane of some form. They clamp onto the flange or projection of the beam and are easily fitted.

The beam clamp offers a semi-permanent fixed suspension point from which to suspend additional lifting devices, such as an electric hoist or chain block. They are typically adjustable to fit the beam width however there are different models available to suit various steel beam sizes. There are different variations available and can have a scissor action, screw lock or bolt fixings. They come supplied with a shackle already attached to provide an instant anchoring point; some have extra reinforced side plates and jaws for extra demanding applications, most beam clamps will have a locking device for additional safety. Beam clamps are also available in varying capacities.

In conclusion then, a beam clamp offers a robust, lightweight, semi-permanent and safe anchoring/lifting point on a steel beam which are very easy to install.

WE AT LIFTING GEAR DIRECT ARE ABLE TO OFFER  TOTAL INSPECTION AND MAINTENANCE CONTRACTS, AS WELL AS A FULL 24 HOUR BREAKDOWN SERVICE, TO ASSIST IN KEEPING YOUR JIB CRANE WORKING SAFELY AT ALL TIMES. 

SERVICE AND MAINTENANCE:-

It's essential to frequently examine the Jib crane for the following defects, and if any are detected, or you are uncertain regarding any aspect it is tremendously important to refer the jib crane to a competent person for an intensive examination.

• Any damage
• Distorted or cracked welds
• Structural flaws
• Movable or absent bolts
• Damaged or absent runway end stops
• Trouble in manouvering the trolley
• Trolley moves on it?s own
• Difficulty in slewing the jib arm
• Jib arm moves on it?s own
• Any other evident or suspected problems or operational difficulties.
• The maintenance requirements can be combined with the ones from the lifting device.
• Lubricate the pivot points plus bearings frequently
• Where the slewing action is provided by manual gears or a powered drive, the gear wheels and drives need to be kept in excellent order and well lubricated.
• Bolts and fixings must be frequently checked to make sure they are firm, also wherever needed they must be re-tightened.
• The running surface of the track needs to be clean and free of debris. 

USING YOUR JIB CRANE SAFELY:- 

On no account employ a faulty jib crane, block or accessories

Never utilize the jib arm or device to drag the load

Place the jib arm cautiously

Prior to moving the jib arm or suspended loads make sure you  possess a clear view of the travel path and that it is free of obstructions.

The block should be directly over the centre of gravity of the load

Avoid swinging loads, push as opposed to pull on suspended loads

You should not let trolleys smash into into travel stops because the load may whip outwards and thus increasing the effective radius and so the resultant loads imposed on the mechanisms and structure

Take the load gently and avoid shock loads

Similar care needs to be taken whilst lowering loads because loading/unloading may cause the jib arm to whip.