A Chain Block (also known as a hand chain hoist) is a mechanism used to lift and lower heavy loads using a chain. Chain blocks contain two wheels which the chain is wound around. When the chain is pulled, it winds around the wheels and begins to lift the item that is attached to the rope or chain via a hook.
How do electric chain hoists work?
How They Work. Chain hoists function with a dual pulley system linked by a chain. This adds a mechanical advantage according to the same principle that works with a pulley. The load is prevented from slipping through a ratchet into the system.
What is the difference between chain hoist and chain block?
Differences between lever hoist and chain blocks
Lever hoist is operated using one hand by cranking the lever/ handle forward or backwards. Chain blocks are operated using hand chain. Chain blocks gives you the ability to lift very large loads up to 50,000 kg with ease by using mechanical advantage.
What is electric chain hoist?
Modern electric hoists include chain wheels or rope drums, using electricity for smooth performance. … The first functionality of an electric hoist is to turn on the hoist motor, lift the load to a height, and trigger the trolley motor to move the weight.
Is used to determine if an endless sling has been overloaded?
A tattle-tail is used to determine if an endless sling has been stretched or overloaded.
How much can a chain hoist lift?
Hand chain hoists come in a variety of capacities ranging from 1,000 lbs. to 100,000 lbs.
Can you use a chain block horizontally?
Chain blocks are designed for lifting loads vertically and should not be used for horizontal or angle hoisting.
Can you back hook a chain block?
Wrapping the main chain and back hooking is sometimes used instead of slings, but this stops the hook swivelling, which means any twists in the chain are not removed. Note: Back hooking is not permitted by the original equipment manufacturers (OEMs) of come- alongs.
How do you unlock a chain hoist?
To lift the load, pull the hand chain (15) to rotate the handwheel in clockwise direction. When pulling the hand chain in the reverse direction, the handwheel will be separated from brake seat (10), the ratchet disc (14) checked by pawl (17) will be released, and the load will be lowered down smoothly.