Good point, Jmiller. It sounds like he was taking a window fan and using it as an adict fan. Certainly a fan mounted in the attic. Certainly you wouldn't need three speeds for a fan way up in the attic.
I have seen this same thing happen several times with Pedistal fans. (having had to replace the switches, if the motor did not burn up) (Pedistal fans are the larger fans more for industrial use, that stand about 6' tall, or like you see in many exercise places to move the air around.)
I have seen it suck up the cords when someone attaches a light string onto the chain, it sucks in the string and then the chain. Normally, the fan has a wire surround guard that the blocks the chain from going into the fan. Air flow is insufficient to lift up the chain and suck it between the wire mesh, but add on a light string and there you go. I even had someone add on the string, had this happen, removed the string afterwards and stated it was never there. He had just thrown the string in the nearby trash can, and when I looked, there it was.
I have also seen this happen when the fan was placed into a Boxed-in frame. This helped to create more air flow immediately around the motor housing (which the chain come out of) and sucked in the chain.
And then there are those who do not test what they sell, as others have advised. Seems everywhere you turn, you find something that could have been made more user friendly with only minor changes. But with mass produced off shores junk being imported, actual testing is very limited. And any part that is heavier add a fraction of a cent to cost...
In my experience one of the biggest failures of engineers is not going down to the lab and putting there hands on the finished product. In so many companies you write some kind of test request and someone else does the test. Engineers should be right in there helping with or definitely monitoring any test results.
Another failure of young engineers is to not understand how their components or systems affect the next guy down the line.
Further, how many times do companies actually take the time to do a good design review and/or design failure mode analysis.
I think this may also be an example of the failures that can occur without proper project management. Sometimes the system just isn't set up to allow someone to take into account how everything goes together. It seems like we bog our project managers down with so many presentations to upper management and cost analysis and other non-productive stuff that they don't have time to do simple design reviews. Kind of sad. Good example of what not to do, though.
Interesting that it appears the entire ceiling fan market has issues. I wonder at what price point does the american market place start to pay more for higher quality. Will we pay more for a higher quality toothbrush. probably. Will we pay more for a higher quality car, absolutely. But when it comes to that $50-$125 price range it appears we will pay for what we get and not complain. Until we start to vote with our dollars and communicate to businesses that we will pay for qualiy, we are doomed to stay where we are.
Seems like a problem like the amount of weight on the fan pull cord is a hard thing for a company to miss. It's certainly not a matter of cutting corners. I guess it must be a matter of just not thinking.
All the ceiling fans in our house, some dating more than 20 years have split phase motors. And, to the best of my recollection all of them were manufactured either in Taiwan or mainland China, so I'm NOT talking American-made HUNTER or CASABLANCA (now defunct!) units. Yet, when I inspect the chamber where the direction switches & speed control swithes are housed, I see there is a multipole capacitor with the approx. values of 2 uf, 5 uf & 8 uf. So, one would assume that these are switched into the winding to provide the additional phase shift to change the fan motor's rotational speed.
Altair has released an update of its HyperWorks computer-aided engineering simulation suite that includes new features focusing on four key areas of product design: performance optimization, lightweight design, lead-time reduction, and new technologies.
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In a line of ultra-futuristic projects, DARPA is developing a brain microchip that will help heal the bodies and minds of soldiers. A final product is far off, but preliminary chips are already being tested.
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