Q&A | MANUAL CHAIN HOISTS
PS: Generally speaking, they’re lighter too, size for size. You’ve not got a big, heavy electric motor in there. Obviously, you don’t need power, so that makes them more versatile – you haven’t got to plug them in anywhere or rely on a power supply.
Andrew Williams: It’s a versatile hoist because it’s lightweight. It’s something you can move from A to B very, very quickly.
AI: [They are] easier for the operator to manoeuvre and position, which can be an important factor in the planning and implementation phase for a lifting operation.
PS: You can also ‘fleet’ with them. So, with certain models, you can transfer loads from one hoist to another, effectively bringing the load out at an angle to meet another hoist. You generally can’t do that with electric hoists. You’d normally see that maybe in
R Manual chain hoists are a cost-effective alternative to other solutions.
a ship, where they’re lifting something in a boiler room, and they will transfer it from one end to the other by using this ‘fleeting’ operation.
AI: Tiger Lifting’s Professional range of manual hoists are perfect for projects where fleeting loads is critical, whether that be in tight headroom spaces or open ground where a power supply is not available. These hoists have our patent protected Quad Cam brake system and have undergone a full and comprehensive testing regime that was drawn up by industry specialists and Tiger’s mechanical engineers to provide evidence that these units can be safely used for fleeting and cross-hauling applications up to 45° without de-rating [operating at less than its rated maximum capability].
AW: One of the key elements to a chain block [another name for a manual chain hoist] that is not focused on these days is it’s precision. From a lifting point of view, where you are using an electric hoist and pressing a button, you’re relying on waiting for that motor to cut out. Now it takes a millisecond or whatever for the motor to stop, but that can [equate to] a couple of millimetres going down, and if you’re trying to land a load on a precise place – maybe over a shaft or over some fixing bolts – the manual hoist, because it’s slower and you’ve got more control over it, is more precise in lowering the load down, rather than with a clunk, if you will, that an electric hoist can potentially give you. On some of the more expensive electric hoists, mainly used with overhead cranes, you can buy items that are controlled and precise, but [when looking at the rental market], a manual chain will be much more precise.
Q A lever hoist is a type of manual chain hoist (© Rigmax)
www.hoistmagazine.com | April 2023 | 33
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