Tag: manual chain hoist
From the outset please note that the manual chain hoist is also regularly referred to as a chain block, block and tackle, hand chain hoist or manual chain block.
Let us now discuss what a manual chain hoist really is and how they work; as the title suggests it is a hoisting device, used to lift heavy loads via pulling on a chain by hand. A hand chain hoist features a suspension hook at the top, this is utilised to suspend the hoist on a suitable fixing point, this is generally a lifting gantry, a Jib crane or perhaps a beam of some kind, they are the safest options, nevertheless it could be just a heavy duty eyebolt anchored to a suitable structure, or maybe a sling hung round a beam, however the structure must be capable of taking the weight and strain of the load. Once the hand chain hoist is suitably hung then the object to be lifted can be attached to the bottom hook on the end of the chain, when securely attached the operator is able to start to pull downward on 1 side of the chain this must be done slowly initially to let you check the stability of the load once it is lifted away from the ground; (an unstable load could cause harsh injuries). The chain rotates about two gears inside the casing, this multiplies the force brought on by the gear ratio to raise the load. Nearly all hand chain hoists have a braking system to hold the load securely for repair work, or manoeuvering to a different position, they might also have an overload prevention device for added protection.
The most common chain block has two falls of chain to lift and let down the load, this is the lightest and fastest to use, however chain blocks are available with various falls of chain, i.e. four; they work exactly the same although the additional falls enable the hoist to lift heavier objects however are much slower since there is extra chain that is to be pulled through more gears.
There are a number of versions of chain blocks obtainable today, every one with various lifting capacities, common optional extras incorporate chain buckets or bags to store the chain in, protecting the chain from damage and personell from possible injury. Lifting equipment specialists will be able to offer good guidance on the best model for your needs.
So what are the advantages of using a manual chain hoist and where are they mostly used; Hand chain hoists permit heavy loads to be lifted with a great deal of precision, they are simple to manoeuvre from one position to another, are cost efficient and especially useful where there isn’t any electricity supply so an electric hoist cannot be utilised, and also where using electricity may be hazardous. The flexibility of the chain block allows it to be applied in many areas, frequently in workshops, factories and many industrial areas.
Here are the essential safe use rules that must always be adopted, but there are many more to stick to, these should be supplied along with your piece of equipment, get in touch with your provider if you don’t possess these safety guidelines.
On no account; exceed the swl; use if defects are noticed or problems assumed; stand underneath a suspended load; tip the load; change the chain without consultation with the provider/maker; lift people.
DO; examine prior to each use for problems; load with centre of gravity directly under the top hook; get it inspected every six months for safety reasons; check that the bottom chain hook will reach the lowest level necessary without the chain running out completely; always pull the chain in a smooth movement, don’t jerk it.
In conclusion; a hand chain hoist offers precision lifting in a portable and cost effective way, they are simple to use and simple to inspect and repair and suitable for a lot of lifting operations; all in all the manual chain hoist is an extremely adaptable piece of lifting gear.