The new forums will be named Coin Return (based on the most recent vote)! You can check on the status and timeline of the transition to the new forums here.
The Guiding Principles and New Rules document is now in effect.
Trying to figure out how a retractable pull out screen (like a banner stand) works.
Derrick
Registered User regular
Registered User regular
Today at work, I accidentally disassembled a banner stand. Oops! As I was fixing it, I got really curious about how it actually works.
For those not familiar, a banner stand is basically a pull down projection screen most class rooms have, but upside down. The theory is the same, I think.
Anyway, the I know (from experience today) that in order to build the tension needed, you can manually crank the rod running through the roll that the banner or screen attaches to. That's all well and good, but rod has a mechanism itself that, while I'm use it utilizes springs, I can't work out how. My googling attempts have been futile. Everyone just wants to sell me the damn things and not give me a diagram of how it works :-p
Any help is appreciated!
Oh, a video showing what I'm talking about (but nothing about how it actually works, sadly):
http://www.youtube.com/watch?v=6oNLGiSE2ZM
For those not familiar, a banner stand is basically a pull down projection screen most class rooms have, but upside down. The theory is the same, I think.
Anyway, the I know (from experience today) that in order to build the tension needed, you can manually crank the rod running through the roll that the banner or screen attaches to. That's all well and good, but rod has a mechanism itself that, while I'm use it utilizes springs, I can't work out how. My googling attempts have been futile. Everyone just wants to sell me the damn things and not give me a diagram of how it works :-p
Any help is appreciated!
Oh, a video showing what I'm talking about (but nothing about how it actually works, sadly):
http://www.youtube.com/watch?v=6oNLGiSE2ZM Steam and CFN: Enexemander
Derrick on
0