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madman
03-23-2005, 12:29 PM
I am trying to come up with a device that is foot operated and can lift about 5 to 9 pounds on demand. I was thinking a sealed air type cylinder with a foot bellows type connected by a simple air hose. The device should allow a slow controlled rate of descent so nothing goes clunk. But i really dont have a clue. Please any ideas guys, Thanx

Bill Cook
03-23-2005, 12:37 PM
Air might be too bouncy for enough control to keep it from going clunk.
Hydraulics with high enough pressure/(small enough cylinders) that seal break away friction won't be a problem

bc

ERBenoit
03-23-2005, 12:41 PM
Knowing nothing of of the "how to's" of pneumatic engineering, only seeinig pneumatically operated devices, possibly a lifting cylinder with a regulated exhaust?

I got a laugh to myself when I first opened the post. "Foot operated lift device", I immediately thought of the device, (boot) on my foot that I once used to "lift" a mangy, stray cat from my porch. I think they weigh in about 5 to 9 pounds.

3 Phase Lightbulb
03-23-2005, 12:55 PM
I think a simple electric water pump connected to your sealed cylinder would be fine for lifting 5-9 pounds.... Reverse the polariy on your electric water pump to go back down... simple.


Here is a simple 12v Electric fuel pump that already has an OFF/FILL/EMPTY switch and it can pump glow fuel which has oil and it's only costs $13:

http://www.hobbico.com/fieldequip/hcap3105.jpg

Connect this little guy up to a sealed cylinder and you've got yourself a mini hydrolic lift.

use standard solicon fuel tubing like this (3 feet for a couple bucks).

http://www2.gpmd.com/image/g/gpmq4131.jpg


-3Ph


[This message has been edited by 3 Phase Lightbulb (edited 03-23-2005).]

precisionworks
03-23-2005, 03:30 PM
Would a tool balancer work?

http://www.hubbell-gleason.com/PreEng/Balancers/Balancr.pdf

Mike Burdick
03-23-2005, 03:38 PM
3 Phase Lightbulb,

That's a clever idea!

darryl
03-23-2005, 09:14 PM
5 to 9 lbs by foot- how about a cable operated device, maybe a stirrup of sorts for your foot and a pully or two for the cable- ?

ibewgypsie
03-23-2005, 09:28 PM
I have built robotics, air over oil, you can meter the oil into a cylinder with a adjustable orifice. Use just a tank full of oil, add air to move cylinder. I converted a old freon tank the last time I tinkered with this.

It removes all the bounce. Use vegetable oil it works and is cheap.

David