MANUAL CHAIN HOIST
will be the same as a regular chain hoist. But when the hoist is unloaded, an automatic speed transmission senses that fact and enables the hoist to travel five times faster than normal when not under load. It is available for capacities from 3.2t up to 50t.
A 30t manual hoist from William Hackett under load at the company’s dynamic test bed.
Tiger Lifting make manual hoists for maritime and offshore, and also for the entertainment industry – another application where portability and ease of installation on temporary structures (such as sound stages at festivals) are required – and where again power supplies are not necessarily available. Loads are usually not excessive. For scenery, sound and lighting equipment, in such scenarios a powered hoist would generally be overkill – heavy and inconvenient to put into place and requiring trailing power cables presenting safety hazards. For entertainment applications, Tiger make their products available in a matt black finish to prevent unwanted reflections from lighting rigs reaching the auditorium and detracting from the spectacle.
Chain blocks, lever hoists and combination block and trolley units are available, and the units are light in weight to make life easier for the assembly crews. For hazardous or potentially explosive atmospheres, Tiger have ATEX-compliant Category II spark resistant chain-blocks and lever hoists. The chain-blocks have stainless steel hand chains and a special corrosion- protected body; the brake chamber is protected from contamination and encloses marine-specification friction discs. Suspension and load hooks, load chain guides, grip rings and hand wheels are all copper plated as a further preventative measure against sparks. The chain is also available as an option in stainless steel (though note that in any capacity over one-tonne, deration – such as lessened safe loading weights – will apply). These are based on Tiger SS19 or SS20 units – SS standing for sub-sea, in which application for manual hoists Tiger also specialise. From all of that, we may deduce that the manual chain hoist has not yet had its day. Its electric-powered brother may offer power on demand, but by comparison is heavy, complex, expensive and suitable for permanent installations only. For portability and convenience, and light loads at least, the human arm still has the upper hand.
The Tiger SS 19 lever hoist with overload protection.
24 | June 2025 |
www.hoistmagazine.com
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