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Posted By tal
Does anyone know where I can get advice on the use of extension forks with counterballance fork trucks.
I have looked at various British Standards and can't find an answer.
It is my understanding that the capacity of each machine is calculated on the fitting of standard forks.
Does the fork truck have to be de rated to accommodate the longer length extension forks?
Any help would be appreciated.
Tal
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Posted By alan brotherton
Check the load rating table for the FLT or consult the vehicle manufacturers and ensure operators know the new safe maximum load centres and loadings when using the extensions.
The maximimum capacity will obviously be derated by longer forks.
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Posted By Kevin Coghill
Go back to the manufacturer or supplier (if leased) and give them the specific details of the extended forks. They then should be able to make up appropriate ratings for the truck based on that initial info.
Remember that the centre of gravity of the truck will be totally different therefore there is a real need to ensure that the new rating/s are produced by a competent person/body such as the FLT supplier etc.
We have just done a similar exercise based on info obtained from our truck supplier after we furnished them with the new extension lifting beam details.
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Posted By The toecap
Now then there's a question. Somewhere on the FLT there should be a plate. On this plate it gives Inch pounds ratings (IPR). These state the loads that may be carried at varying dsistances from the heel of the normal fork. I can't quite remember of the top of my skull but a very simple calculation can be crunched to determine the IPR with the new extended forks. This will then determine wether it is safe to carry the new load. You will of course also need to know the mass of the load to be carried and its centre of gravity. Try having a browse on IPR and see what comes up. Althoug i can say i haven't tried it. Phew
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Posted By DKH
A formula that is commonly used is
Rated Capacity x Load centre Divided by New load centre.
Eg truck Rc =1500 X Lc 500
Divided by new LC 800.
as guidance only, do not forget that any attachment additional weight will also reduce the trucks original the original lifting capacity,
both accessories supplier and lift truck manufacturer should be able to advise on the plate will need derating.
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Posted By LMR
The weight of the fork extensions must be taken into account when calculating weight of lift; also fork extensions should be no more than 50% of the existing length of the fork.
Speak to either the supplier of your fork truck or a supplier of extensions and discuss with them the truck that you are using and what you are intending to do.
There are a lot of variants to be considered in addition the ability of your operator to handle the additional length of the forks; familiarisation with the kit is a must before performing lift.
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Posted By Taff
Hi,
Hope this helps.
Flt blade extensions
• The Regulations regarding selection and fitting of fork extensions have been
clarified and changed following the publication of:-
BS IS013284:2003 Fork Lift Trucks - "Fork Arm Extensions and Telescopic Fork
Arms - Technical Characteristics and Strength Requirements.
Key Changes are:-
* Minimum blade length for any fork arm to which an extension may be fitted
is 750mm
* Maximum allowable extension length is 40% of the parent fork arm blade
Examples:
Maximum fork arm extension length on a fork arm with 1000mm blade is 1400mm
Maximum fork arm extension length on a fork arm with 1255mm blade is 2134mm
Maximum fork arm extension length on a fork arm with 1800mm blade is 2520mm
The following information must be supplied with each set of new fork arms:
* Mounting instructions
* Capacity rating and limitations of use
* Periodic examination for wear or damage
The following information is to be marked in a durable and legible manner on
each set of fork arm extensions:
* Manufacturers name
* Serial number and year of manufacture
* The rated capacity and load centre distance for the fork arm extension
Taff
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Posted By Robert K Lewis
Taff
I think you have got your wording mixed up here and have ended up giving the max permitted final fork blade length with extension not the max permitted extension. Your second figure for 1250 blades looks wrong as well.
Given the 40% limit the figures come out at 400mm, 500mm and 800mm max extension( I think:-)). I am always relectant to go down this road though as abuse is so easy to do.
Bob
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Posted By Robert K Lewis
Sorry the last figure should be around 725mm I think:-) Heigh Ho thank goodness for manufacturers who should tell you this without the blink of an eye!!!!!!!!
Bob :-)
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Posted By tal
Thanks for all your responses. It has given me food for thought and I shall contact the supplier asap.
Cheers
Tal
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