Hardware and Fasteners - Need some type of cylinder
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wp65775
08-21-09, 01:47 AM
I’m new to these forums and am asking for some help on a personal project. I don’t know, I may be asking for something magical, but I’ll never know if I don’t ask. I need cylinder of some kind that will allow me to do the following. I want to load 25 lbs of gravel in a bin atop the cylinder, and once it reaches the 25lbs in the bin it lowers itself 12 inches where the gravel bin is immediately pulled off by hand, and the cylinder rises back to its original position. I don’t want the bin to start lowering till the bin gets 25lbs of gravel loaded in it. And like I said I want the bin to return to the original position once the bin is yanked off of it. That being said I do not want to use any electricity, and for simplicity sake forget the weight of the bin. And…I would like to be able to adjust it to operate with 50lbs of gravel on some days, so obviously I’d like it to be adjustable. I can’t think of anything else to add, so I’m just going to say thank you in advance.
chandler
08-21-09, 06:10 AM
Sounds like a school project to me. Think levers, fulcrums and counterbalances.
Pilot Dane
08-21-09, 10:27 AM
Oh, I like school projects. Especially ones that involve fire or volcanos.
I am thinking of a pneumatic piston with a spring to return it to the up/extended position. Put an adjustable blow off (pressure relief) valve on the bottom (compressed side) of the cylinder with a check valve T'd into the line. You adjust the pressure releif pressure to set the amount of weight for the cylinder to lower. Once the weight has been removed the spring pushes it back up to the extended position and the check valve allows air back into the system.
I am thinking of a pneumatic piston with a spring to return it to the up/extended position. Put an adjustable blow off (pressure relief) valve on the bottom (compressed side) of the cylinder with a check valve T'd into the line. You adjust the pressure releif pressure to set the amount of weight for the cylinder to lower. Once the weight has been removed the spring pushes it back up to the extended position and the check valve allows air back into the system.
printer-man
08-22-09, 02:48 PM
have you considered a see-saw with an attachment for
weights from a weight lifting bench to counter the
25#s of rock? i know it would take up more room
but it may be cheaper to construct.
just make sure your out of the way when it comes back up.
or a slight return spring to counter the return speed
weights from a weight lifting bench to counter the
25#s of rock? i know it would take up more room
but it may be cheaper to construct.
just make sure your out of the way when it comes back up.
or a slight return spring to counter the return speed
chandler
08-22-09, 07:05 PM
That's levers, fulcrums and counterbalances at it's best. Just depends on where you put your fulcrum.