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  • Permobil M300 power chair modification

    Discussion in 'The main mechanical design forum' started by gstq54, Jul 26, 2020.

    1. gstq54

      gstq54 New Member

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      Hope that someone can offer design and hardware solutions.


      Ten years ago I had a stroke and lost the use of my left side. I had been a linux admin and software developer for 15 years. Always an avid DIY enthusiast I still have projects in mind. I spend most of my time in a Permobil M300 power chair and would like to mount a platform behind my seat that swings around a pivot and ends up just to the right of my chairs controller. That means rotating the platform through 270 degrees. Perhaps a couple of linear actuators could be used to achieve this?

      Thanks, Richard Wilkinson
       
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    3. dsgn2mfg

      dsgn2mfg Member

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      Richard,
      I would be glad to design and help you with this for free. I recently did a TV mount that started with a stock component that swings through to 300° and then slides our 12". It cost me under $100 but it is manual. Depending on what precision, stoke and force you need an inexpensive 12vdc linear actuators go from $40 to $400, but most likely can be done under $60. Let me know.
       
    4. Stephen Blizzard

      Stephen Blizzard New Member

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      Hi Richard,

      I don't have a lot of time to spare at the moment. I wish I did because it sounds like a rewarding project. Looks like Michael might be able to help you out. I would just like to offer a suggestion for using rotary acuators. They might save you some space in the design if rotary motion is what's desired.
      Maybe something along these lines: https://www.johnsonelectric.com/en/product-technology/motion/stepper-motors/rotary-stepper-motors
      I'm sure there are many other suppliers. This is just to give you an idea.

      Stephen.
       
    5. Stevo

      Stevo New Member

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      I agree with Stephen. Although Michael's proposal may potentially be less costly, it almost certainly will involve more parts, which could involve guarding or putting into an enclosure. The SEMI-ROTARY actuator is a self-contained piece of kit (essentially most designs comprise opposing linear actuators operating on a spline shaft, within the same housing/body). Transferring the torque from a small diameter shaft would be relatively easy.
       
    6. bw2011

      bw2011 Forum Manager

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      Hello All, I got this suggestion via email from another member:


      Dear Richard, the pivoting platform should be mounted to a vertical shaft on one corner. The shaft would be driven by a worm drive with a forward and reverse electric motor giving it a more gentle pivoting speed. Hope this will help Ian Mackay.
       
    7. gstq54

      gstq54 New Member

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      Thanks for all your suggestions, I thought perhaps a rotary actuator would work best, but not sure he to select the right device. Being on a fixed budget, the cost is always a concern. After all I am a cheap Brit who has lived in the States for the past 38 years!!
      I like to fiddle with my Raspberry pi and figure I could use that to control the actuator?
      Since my stroke, my wife has become quite the DIY gal, so I think between us, we can make this work.
      Thanks again for the input and I look forward to more suggestions.
      Cheers, Richard
       
    8. gstq54

      gstq54 New Member

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    9. gstq54

      gstq54 New Member

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      Michael, thanks so much for your offer to help with the design. I would be very interested to see what you have in mind. We live in Arizona, not that that matters and you can reach me at [email protected]. As the budget is limited I would like to get this done for about $200
      Cheers Richard
       

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