A hoist is a kind of machine that is used for lowering and lifting of heavy loads. The load is lifted using rope or wire that is looped all over the drum or the wheel. In many applications, they are generally perched overhead by means of a lug, hook or trolley. A lug or hook can be used to permanently affix it to a trolley or mount a hoist in one location. A trolley is a vehicle which travels on an overhead beam or rail, generally used for moving it and its load from one place to another.
Trolleys and hoists can be powered by electricity, air or hand and are available in different configurations and shapes. The lifting means to move and suspend the load either up or down in a hoist are generally roller chain (similar to a bicycle chain), link chain (coil chain) or wipe rope.
Since it is a force multiplier, provides you the ability to pick up extremely large loads (up to 50 tons) with ease with the help of mechanical advantage. Most of them are normally used for irregular maintenance applications where there is no need for speed. They are significantly less expensive than the powered lifts, but they need physical effort (pulling on the hand chain) for lifting the hoist. They’re not high-speed and shouldn’t be specified for continuous lifting applications, particularly when long lifts are necessary.
What parameters to consider when specifying a hand chain operated hoists?
A few parameters that must be considered while specifying them are:
- Dollars available for purchase
- Frequency of lifts
- Height of lifts
- Speed of lifts
- Weight of load
Many domestic manufacturers supply overload protection devices for hand-driven lifts, either as normal equipment, or as an additional cost option. This device is used for protecting the overhead structure, the user, and the hoist from a “too much overload condition”. Some chain hoist manufacturers make use of a clutched hub, friction type, as a part of it. When the lift on the chain is likely to slip the clutch and avoid the load from being raised, the operator automatically gets aware that the lift is overloaded.
What are its Typical Applications?
Usually in the industries, they are most often utilized as an in-plant gear for regular maintenance applications. A typical use may be for lifting generators, pumps or other heavy tools in water treatment facilities. Whether it is utilized in machine shops, construction, farms, automotive garages, private room as well as many other applications exists for chain hoist and several thousand are sold every year.