Retractable Cord
March 3rd, 2007
How do retractable cords work?
how does the push of a button retract the cord? try and explain it from the inside out please.
I need to make one for my project,
oh and try and include a picture please.
What stops the cord from winding back in when you let go of pulling the cord?
That’s actually a very good question as the cord isn’t just wound up on a reel as it also needs to be connected to the inner workings of the appliance somehow. If it was just wound up around a reel with one end connected to stationary terminals then any turning of the reel would twist the cord between the reel and the terminals till it pulled out of it’s terminals. If you anchored the midpoint of the cable on the reel and wrap the slack in both directions from the midpoint up onto the reel then it would just unwind from both ends simultaneously and you would have a tangle of cord inside the machine whenever you pulled the cord out.
One way around this is to not connect the leads to anything inside the appliance but to concentric conductive circles on the reel itself, then brush or button contacts that are connected to the inner workings of the vacuum cleaner can ride on these conductors and pick up the power much as an electric train picks up power from the overhead wires or third rail. Of course having ring conductors and contacts does not always make for a reliable power connection and runs the risk of sparking so this is a less then ideal solution.
Another solution would be to have the takeup reel matched with a moving bracket. The midpoint of the cord is anchored on the reel and then wound up such that both ends play out when unreeled, by winding the slack that is to remain within the appliance on a smaller diameter section while the end being played out to the outside world on a larger diameter wheel, the amount of slack that must remain in the appliance housing is minimized and it’s wrapped back and forth across the moving bracket which moves apart to house that slack that must remain in the housing. This allows the cable to be firmly and reliably connected to terminals in the appliance but at a greater cost.
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Factory Price 3.5mm Retractable AUX Auxiliary Cable Cord for iPOD MP3 CAR $0.01 |
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Silver tone Shiny Fish RETRACTABLE PHONE CORD 7 feet $0.01 |
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Factory Price 3.5mm Retractable AUX Auxiliary Cable Cord for iPOD MP3 CAR $0.99 |
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