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Can some one please teach me how to make this.

Whenever you see the word 'patent', head over to Google:


Unfortunately this is only a design patent, so the details are missing. A
design patent isn't a 'real' patent, but anyway.

You need to look closely, but there are a few hints. The big one is the
ring is in two halves, on the picture you can see the line where the left
half is pressed on.

The holes in the gears are countersunk, so the shafts are flared (or
flanged) to stop them coming out (like wood screws). The trick is where the
shafts poke out under the gears they have a hole drilled though them.
There's a pin used to lock the shafts on.

I'm guessing the groove on top of the shafts is used to align them during
assembly, this would be needed if the left half & pins were one piece. Or
it's just decorative.

So make the right half, drill to hold the shafts (but not through the ring),
drop the gears on, slide in the locking pins, and press the left half on.

My initial thought was the gears were bevelled, and the rack was also in the
opposite direction just enough to stop them falling out. I found this:
but it's wrong - it doesn't match
the patent drawings.

That's quite a fiddly build. Good luck!

Tony