Buffers and chain coupler

Okay kiddo, so let's say you have a big stack of blocks that you want to move from one place to another. But if you just push them all at once, they might fall over and make a big mess. That's where buffers come in.

A buffer is like a helper block that you put in between your stack of blocks and your pushing hand. When you push the buffer, it moves a little bit, and then pushes your stack of blocks a little bit. This helps keep everything steady and prevents the blocks from falling over.

Now, let's say you have two sets of blocks that you want to move at the same time, one after the other. But if you just push them both at once, they might crash into each other and make an even bigger mess. That's where a chain coupler comes in.

A chain coupler is like a connector that links the two sets of blocks together. But it's not a rigid connector like a stick. Instead, it's like a piece of stretchy rubber that can let one set of blocks move a little bit before the other set starts moving. This way, you can move both sets of blocks without them crashing into each other.

So, to sum up: buffers help keep things steady when you're moving a stack of blocks, and chain couplers help you move multiple sets of blocks without them crashing into each other. Simple as that!