Roll on the 20th June

[Rusty_Springs]

Hi All
I enjoyed this gate thing today and I can take it one step further and make the gate latch and unlatch by using attracting magnets like they have in kitchen latches with the steel on each side of a magnet to weaken the magnetic force, I would have two of the latches one on a post one on the gate then two repeling magnets like I said one on a post one the other side of the gate to the latch now what would happen is I pump air down the tube to open the gate, the air pressure would break the seal of the magnetic attraction of the two latches then the air pressure would push the gate until it reaches the other repelling magnets where the magnetic force would push the gate back until it reaches the attraction of the latches where it's attracted in and locks again, now not only do I have a gate that opens and shut with a little air pressure but it also latches.
Take Care All
Graham

[ramset]

SEAN that is going to be one sweet demo unit    looked at your THK link wow   your gonna have to chain that thing down   Chet PS currious to see what you do in the middle

[fletcher]

If i lived on a farm and my gate was 100 metres from the house, how would you open the gate for a visitor when it's raing without walking or drivng down to it? without modern remote controls or any cables that go up to the house, and have the gate close itself without any springs or cantelever hinge?

... snip ...

try this,

for a farm gate, an inside bowl from a washing machine, a single water dump down the chut lowering the drum/bowl against a single pulley wheel to the gate and it opens, there is a senond rope on the bowl to an overhead pulley that simply goes to a small 10kg counter weight.as the water drains through the small holes the counterweight raises the bowl and closes the gate.

or if you were an egyptian, you would simply have a small amount of water onto the end of a lever/fuclrum beam at ten to one and get the same result.

Got to replenish the water in the hopper each time, so that means a water pipe to the sieve hopper or only take visitors after the drought breaks & the hopper fills itself   

Saw this a few months ago on Nat Geo channel where they were talking about old inventions from the Middle East 1000 years bce to 800 years ace - was used in conjunction with a water wheel that lifted the water which then poured into a sloping trough servicing a series of sieve hoppers attached to offset levers that lifted a stamp to do work - then the water ran out & the lever fell again resetting the mech etc.

[b0rg13]

hi folks, i had this idea in my head last night and decided to draw it this morning..... the outer wheel turns CW, and there is a small arc of magnets pushing other magnets on a swing arm moving them to the right,( well at least id like to think so), of course i really have no idea.

[The Eskimo Quinn]

not too sure about the math on the air pressure? even 1 kilo of air pressure per metre is huge over 100 metres, to see this as a real life trial, tape 10 straws together and then into a balloon and try an blow it up. afraid you would need between ten to 20 people standing on the bellows.