What is Snowplow? Is it Useful?

 
Chain Blocks or Come Alongs?How do them work?
Chain blocks are portable devices used to manually lift or lower a load. A hand-operated chain hoist is usually smaller and more compact compared to an electric hoist of the same size. Chain blocks are able to lift in a vertical position only. If they are side loaded or used horizontally it is possible for the mechanism to jam.
A come along (also called a wire rope hand ratchet puller) is a manual device that can make moving heavy loads by hand possible.
A chain block is operated manually, made from a combination of internal geared pulleys fitted with chain. The user will pull down on the hand chain, this will turn a pulley mechanism inside the hoist to move the load. There is a hook on the end of the load chain for ease of attachment to the load and a hook on top to secure the chain hoist to a suitable support.
A wire rope puller operates very similarly to a lever block except with wire rope instead of chain. To release the cable... [More Information]