A Chain Block (also known as a hand chain hoist) is a mechanism used to lift and lower heavy loads using a chain. … 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.
What is a chain hoist?
: a tackle employing an endless chain instead of a rope and operated especially in workshops from an overhead track for hoisting heavy weights.
What is the difference between a chain hoist and a come along?
A chain hoist is operated by pulling down on a chain. … Chain blocks only move loads vertically. A come along, or lever hoist has a chain that is operated by a lever or a hand crank.
When would you use a chain pulley?
Chain Blocks are also used on construction sites where they can lift loads from the higher levels, in assembly-line factories to lift items to and from the belt and sometimes even to winch cars from treacherous terrain.
How does chain pulley work?
A chain hoist is operated by hand. An operator will pull down on one of the chain loops on one side of the chain. This will turn a pulley mechanism inside the chain hoist housing. When this pulley turns, it will lift up the end of the other chain which usually has a hook on the end.
What is the weakest part of a chain hoist Why?
What is the weakest part point of a chain hoist? Why? It will spread when overloaded. … Chain hoist should be equipped with an automatic load blank to prevent the load from dropping.
How do I choose a chain hoist?
Factors to Consider When Selecting a Hoist
- Determining Required Capacity. …
- Selecting a Suspension Type. …
- Choosing Lift, Reach & Headroom. …
- Understanding the Operation Type Needed for Your Application. …
- Determining Required Duty Class. …
- Picking Your Lifting Speed. …
- Determining a Power Supply.
Are come alongs dangerous?
Hand-operated hoists have many applications around a drilling rig. These devices are simple to use but misuse can result in sudden failure, property damage and serious injury.
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 I use a chain hoist horizontally?
(Hand) chain hoists, typically, can only be used vertically. If they are used to move the load horizontally, the chain will get jammed and gears inside can be damaged to shorten the lifespan.
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 use a chain block safely?
Secure the Chain Fall or Chain Hoist to a structure that can withstand the load. Position the hook directly above the centre of gravity. Use the chain pulley block only for vertical lifting. Use appropriate personal protective equipment during lifting operation.
How do you install a chain pulley?
Installing trolley and connecting it to the hoist
Insert suspension shaft into side plate G and lock it with suspension shaft bolt, slotted nut and split pin. Ensure to fully bend both branches of split pin. Insert fixing shaft into side plate and lock it with a split pin. Ensure to bend both branches of split pin.
How many types of chain blocks are there?
There are two different chains in chain block which are load chain and hand chain. Load chain lifts or lower the loads when the hand chain is pulled.
How do you lower chain hoist?
Pull the hoisting chain on the front side of the hoist towards yourself with long, straight movements. Keep pulling until you have hoisted the load as far as you need and slowly let go of the chain. Lower the load again by pulling the chain from the opposite direction until it has safely landed on the floor.