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  1. #11
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    Hy there

    I put an UP to this thread for I am too looking for some device to solve the unmanned hammock issue"
    I too have googled it with no result
    The only patents I found don't seem to be very efficient, because they don't consider the part of non-linearity and resonance this kind of motion involves

    ex here or here

    I guess those two devices, would quickly go to an erratic motion
    So we need some electronical part within the device that "reads" the movment...

    I assume one time the motion is initialized, the force to maintain it would be quite weak. For my part the knowing of this force would be a first step.
    So my questions :

    Is there any physic specialist to give me a clear (and easy to understand !) equation that consider the different parameters that play in a hammock swing ?

    What would be the minimal strengh we need to apply ?

    Would a 12V device be powefull enough to fullfill this ?

    Those essential questions would determinate if I go further in this Great Quest : the quest for the release of the laziest hammockers all over the world !!!

    see you

  2. #12
    Klaussinator's Avatar
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    Funny to see this post show up --- I've actually tinkered with this idea years ago. Here's what I learned:

    - The idea of a motor like the 12v wiper assembly to push/pull on the hammock only works when it's in sync with the swing of the hammock, and that's not very often! The best luck I had with this was using a bungee to connect the cam to the hammock, so that out-of-sync pulls didn't really stop the natural swinging motion. Not a winner in my opinion.

    - The ultimate solution, I believe, is a system that senses when the hammock reaches one side of its swing, and then pushes or pulls it the opposite direction. It would then wait until the hammock swings back and trips the sensor, so it can give another push or pull. This idea would allow for speed differences due to weight, swing distance, etc.

    If I was going to fab-up one of these systems (and now that you've got me thinking, I might just have to work on it ...) I'd try to build a small battery powered box that would sit on the ground beside the hammock, maybe staked down or anchored to a tree about 4 or 5' away. A line coming from the box would hook to the center of the hammock. When the hammock swings away from the box, the line gets tight, pulling on a switch that tells the motor to give a tug on the line. I think it would only need to pull the line about 6" to effectively keep up the momentum, as long as it it timed correctly. Maybe use a short piece of shock cord or bungee on one end of the line to smooth out the tug.

    Just my $.02 for what it's worth --- That and some more change will buy me a senior coffee at McD's in a few years

    -Klauss

  3. #13
    'that' guy Chenvre's Avatar
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    I am no physics expert, but I bet something can be made from an old motorized baby swing chair rocker, specifically the ones with the chair hanging from the rocker assembly from a single point. The low voltage motor and assembly looks like it can do the motions needed for rocking a hammock with minor modifications.

    I can post pics later if I haven't given a good enough description.

    Interesting to see what people here will inevitably come up with!

  4. #14
    gargoyle's Avatar
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    When our kiddos were little, they sat in one of these wind-up baby swings. No power needed, just crank up the mechanism and set the chair to a'swinging. It'd rock for probably 20 minutes, IIRC. As soon as it'd stop, they would wake and start crying.



    I dont see why the same technology cant work for hammocks....just gotta find somebody to crank it up every 20 minutes.


    Edit..Chenvre beat me to it, I didnt read all the posts.

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