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Category: powerchairs

C.R.I.P.S.R.I.S.E. collab: 3D printing for Permobil chairs

As part of GOAT’s collaboration with C.R.I.P.S.R.I.S.E., I’d like to quickly show off their newest 3D printable design, a hook designed to work with the Permobil’s Unitrack mounting system. You can take a look (or print one yourself!) on Thingiverse:

https://www.thingiverse.com/thing:7150714

3d model of a bag hook mount for a powerchair

One of GOAT’s workshop participants asked for this for his chair, and would like to test different styles of hook. There are some printable designs already out there, for example, on yeggi.com: https://www.yeggi.com/q/permobil%20unitrack/

After taking a look at this and other designs, @CriptasticHacker ended up using this model as a base, improving on it, and publishing it with an explanation of his changes.

I was curious to see this printed with a strong nylon or carbon filament, but was persuaded that we should first try this PetG model before amping things up to print in tougher filament that will take many more hours of run time to complete.

We’re looking forward to installing it and giving it a good test!

 

 

 

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Small modifications to a Whill powerchair

And now for something completely different! Last week we saw some highly technical wizardry. Today I spent some time just cobbling things together with low tech “found materials” in my basement, to minorly improve and modify my powerchair.

My Whill C2 powerchair needed a cane holder and I had a section of PVC pipe set aside to make one. You can get a $100 fabric cane holder, kind of like a quiver for arrows, from Whill, but I figured why not spend a dollar to make one instead.

Here’s my short length of pipe, with holes drilled into it, ready to attach to the chair frame. I figured I could find somewhere to put it, and got out some cable ties and other material to see what might work best to fasten it on.

a two foot length of black pvc pipe, about 2.5 inches diameter

First of all, take a look with me at the seat back of the C2. It has a nice aesthetic look to it, curvy, sleek, matching the rest of the chair. It even has double slots on both sides, useful for attaching a cane holder.

curved plastic piece on top of the powerchair seat back

However, I felt that on top of this curved plastic cover, my round length of PVC pipe would stick out further than it needed to, and I also figured taking the cover off could expose a different set of slots in the actual seat back slots. The cover doesn’t do anything functional. It just hides the metal and bolts of the seat back and frame. Off it goes!!!

Here’s the seat back of the C2, naked:
metal powerchair frame with seat back bolted to it, plain and utilitarian

There are four bolts that go through the long slots in seat back and into the frame of the chair, meant to allow you to loosen the bolts and move the seat back up and down to adjust it to the height you like. This is a nice feature of the Whill design! To get the plastic cover off of the frame, I had to completely remove these bolts and the seat back, temporarily.

Already, you can see how this kind of modification goes. You have a simple idea: attach a length of tube to a wheelchair. You then realize you have to take apart more of the chair than you thought you would. Keep going back for more tools, more sizes of bolts, nuts, and washers, and so on.

To that end it is good to be extra prepared in your work area. Have a tray or bowl or two ready to hold screws and small parts. Have a sharpie and some tape to label things or even a notebook to take some notes!

It is also great if you have a secret hoard of a million different sizes of screws and bolts and little tools. Saves you having to go to the hardware store and lose all your momentum to finish a project!

Back to our hack!

Maybe I lied a little bit about the uselessness of the plastic cover: It has some little “ears” that stick up maybe half an inch, which are meant to help you hang something on the back of the chair. They aren’t big enough or tall enough to hold a substantial backpack, grocery bags, or anything real, in my opinion. I end up just looping the shoulder straps of my backpack all the way over the entire seat back.

So, as I looked at the slots in the newly naked seat back, I figured I could also add some hooks. Back to my workbench to dig around in the drawer of hooks and brackets. I had several possibilities!

an assortment of wall hooks and drawer knobs

The narrow black hooks seemed like the best fit. They came with screws to attach them to a wall. Since screws would not work well with the wheelchair frame, I had a search through my motley collection of nuts and bolts. It had to be a small bolt thin enough to fit through the hole in the coat hook, not too long so it didn’t end up poking me in the back, and I had to find a washer that would help stop the bolt from falling through the fairly wide slot.

Here is what I ended up with. M4 bolts, with hex socket heads, 15mm long. The washers aren’t quite right and don’t match each other. But they work well enough for now.

some not exactly right and not matching large washers holding the bolts on

I have a note to get better washers and also to get some rubber stuff to shove between the washers and the curved seat back, so that it won’t slip or come undone. (I have good luck going to hardware stores and just asking someone who works there to suggest an option!) Once I have some rubber rings or maybe even just a foam sheet in there, I could also add some vibra-tite or blue loc-tite to the bolt to keep it from coming loose.

As another critical step in this process, I added spare bolts and the right size hex keys to tighten them into my portable toolkit!

a small pouch with fix it zine and tools, bolts added to a little tin that goes in that kit

Finally I am ready to add my cane holder.

Or am I ?

I looked at the slightly battered piece of black PVC pipe. It will probably get covered with stickers so maybe I don’t care how it looks. But the edges were very rough where, a while back, I used my (glorious) cordless mini-ripsaw to hack a length of pipe off of a much longer piece. I imagined my grocery bags catching and tearing on it, or someone helping me load the chair into a car scraping against the jaggedy edges. A metal file and some sandpaper helped me to smooth down the edges nicely!

Then I used two cable ties through the holes I drilled, to pull it tight to the vertical bar of the seat back frame. It felt like it needed a little extra snugness so I added two black pipe cleaners around the frame and the entire pipe rather than through the holes. Gaffer tape, duct tape, or more cable ties also would have worked fine for this stabilization but I was curious how pipe cleaners would hold up.

Here is the final look. It doesn’t look too bad! It’s at least neat and compact, the hooks are black to match the frame color, my cane fits nicely into the holder, and the hooks will carry my backpack and several grocery bags as well!

cane holder and hooks now on the back of the powerchair

I was very happy with my little modification! I even remembered to clean up my workbench to put everything away, since I got out about 100 more things than I had originally intended to.

workbench covered with tools and bolts, with drawers labelled "hooks", "sandpaper", "lockpicks" and so on.

This should be written up as kind of a recipe rather than this log of my process, but a journal of how I figured out how to do this is also useful, I think!

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Love Your Ride – wheelchair maintenance and repair workshop

GOAT is running another free workshop in San Francisco, at the Independent Living
Resource Center SF! In honor of Valentine’s Day we are calling it “Love Your Ride”. At this event we will test out our pilot Fix-It-Kits, which are small pouches of tools and materials, along with a pocket sized zine.

The zine has a workbook page to record useful information about your mobility device, and then goes through inspection, cleaning, checking vulnerable points like all bolts, screws, wheels, folding parts, and attachments. Collecting that info will help us construct a custom kit, with replacement bolts, tools for tightening bolts and screws, and so on.

a colorful zine and some tools coming out of a zippered pencil pouch

Free workshop to learn maintenance for your mobility gear
Wheelchairs, powerchairs, scooters, walkers, rollators, etc.

Time: Saturday, Feb. 22, 2:00pm – 4:00pm
Location: ILRCSF, 825 Howard Street – San Francisco

FREE TOOLKIT AND INSTRUCTION MANUAL

We will work with you to make a custom maintenance and emergency repair kit!
You will get to take home a small, portable bag with tools and materials customized for you.

There is also a workbook to fill out with information about your mobility device or devices.

We will look for service manuals and other information to give you as well!

Please register by emailing Brianna@ilrcsf.org with your name, phone number, and any particular access needs you have. Or you can call or text Vincent @ 415-609-2555 if you prefer that to email. We’d love to see you there!

A joint workshop by Grassroots Open Assistive Tech and ILRCSF
Liz Henry, liz@openassistivetech.org, https://openassistivetech.org
Vincent Lopez, vincent@ilrcsf.org, https://ilrcsf.org
Marisol Ferrante, marisol@ilrcsf.org, Nick Feldman Assistive Tech Lending Library

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Free Webinar: Power wheelchairs and Right-to-Repair law in California

MARK YOUR CALENDARS!
December 12
2:00-3:00 PM, Pacific Time

The CIL’s partners at the DONetwork are proud to put on this educational webinar explaining the ins and outs of the new Power Wheelchair Right to Repair law in California.

Please register here: https://tinyurl.com/DOnetworkSB1384

The DOnetwork will be producing a public education webinar for SB 1384, the “powered wheelchair right to repair” bill, sponsored by Sen. Dodd. This legislation becomes law on January 1, and it has impacts that will increase the ability for independent repair shops and individuals to access parts and equipment to make repairs on powered wheelchairs.

Here’s an overview of what will be covered:

  • What SB 1384 means for the community, and how it will be implemented in California?
  • How is right to repair working in other states?
  • What are the next steps for pushing this issue in California?
  • Invited panelists include State Senator Bill Dodd, Capitol Staff Ana Vazquez, a representative from NCART – the association for providers of power chairs and complex rehab technology, and a consumer.

    a whill model ci powerchair up on a jack with the front wheel removed

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    Be Seen on Halloween: a workshop for DIY lights and safety mods

    In a collaboration between GOAT and San Francisco’s Independent Living Resource Center, we held a pilot workshop in downtown SF last month, where we provided lights, reflectors, reflective tape, and other useful modifications for mobility gear.

    This is a photo heavy post! Here’s me smiling to welcome you to this workshop:
    white non binary person with glasses and purple hair, smiling, wearing tshirt with wheelchair user with symbolic flames trailing behind them

    We hosted at ILRCSF, where Vince Lopez runs a free wheelchair repair program. There, SF residents can get maintenance and repair done on their tech – and if you get stuck at home or on the street with a broken chair, Vince will come out, fix the chair or get you to a safe place and take the chair for repairs. You can even borrow a loaner powerchair, scooter, or manual chair. Also from ILRCSF, Marisol Ferrante joined us, to show off the Nick Feldman assistive tech lending library, another great free resource.

    Vince displaying a walker with spiral LEDs:
    Vince, smiling latino man with a flat cap, holding a lit up walker

    We laid out all the gear that we bought to try out for the event, including reflectors and headlamps made for bicycles, reflective tape, and various kinds of LED strips; mounting clamps, straps, cable ties, gaffer tape, and portable usb battery packs.

    an array of small gadgets laid out on a tablecloth

    None of this is very “high tech” but having it all there together made a great introduction to thinking about ways to modify mobility gear. When you set out to do this, you have several issues in play:

    * DURABILITY: The mods need to be very durable for heavy use, or easily replaceable.
    * PINCH POINTS: You need to be aware of how your chair, scooter, walker, etc. fold or are put into storage or, say, a car trunk, so you avoid putting any fragile components onto “pinch points”.
    * ATTACHMENT POINTS: You need to consider ways to attach things to your gear. That may mean velcro or cable ties to a metal tube frame, or some other method of attachment. Clamps meant for motorcycles, bikes, or camera tripods often work well, but every wheelchair is different, and people also have different use patterns for them.
    * POWER: If you are dealing with electronics, as we were with light strips, you need a power source. I like external battery packs, because they are easy to attach to a frame, or put into a small pouch.
    * COST: Often, cheaper is better! It can be a tradeoff between durability and cost, though.
    * DIY-ability: You may need easy do-it-yourself solutions. Ideally we would have the resources of an auto body shop, and be able to cut and weld metal, but that isn’t always realistic!

    We had a blast setting people up with gear. Everyone had a try at installing their own equipment or working with people who came with them to get lights on their walkers and wheelchairs.

    Judy worked with me and her daughter to line the bottoms of her foot rest plates with twinkly christmas-light style LEDs. The LEDs also had a remote control so she could change their color. She also asked for two headlights pointing downwards from the footplate so that it would be easier for her to see curbs or bumps in the sidewalk.

    Part of the fun of working with other wheelchair users for me is always seeing how they have come up with their own solutions. Judy’s main hack was that she had dozens of rubber bands of all sizes around her powerchair arm. She used these to keep her phone in place on the wide arm, and then set up the remote control for the lights on the other arm of the chair. I am adding the deceptively simple (and cheap!) “plain old rubber bands” solution to my tool box!

    While we installed the lights I also noticed Judy’s foam insulation tape added to the rim of her footplates. If you have been in a powerchair user’s house you may have noticed some dents in the walls! And things like protective strips along corners that stick out, because a powerchair packs a lot of force even at low speeds. The easily replaceable, cheap foam strips are a great idea to save wear and tear on your walls and other people’s shins! But, Judy’s daughter mentioned they peel off and look kind of bad as well. I suggested narrow black gaffer tape wrapped around the foam and foot plates. It isn’t perfect, it won’t last forever, but it will look nicer and will make the foam last for a year or two instead of a month. To refresh it — just add more tape! Gaffer tape is more expensive than duct tape, but is flexible and will last much longer.


    Video description: an asian american lady in a powerchair, waving, and her daughter, posing with smiles as the lights under the chair’s footrests blink and glow.

    Deniz came with a travelscoot and a walker, and her own pit crew who were very enthusiastic helpers! They went for the lights, and installed COB (chip on board) LED strips along with a cable splitter and a battery pack on each device. The Y splitter means you can symmetrically install two light strips and plug them into one centrally located battery pack. Their install job was flawless!

    A smiling woman with a halloween party hat, sitting on a travelscoot, with two guys doing thumbs up behind her

    Bill tried out some lights of various kinds, including spoke reflectors for a manual chair. These spoke covers are small and fiddly and annoying to install, but they are also cheap and last a good long time. They also may pop off occasionally and need replacing, but I prefer that to having peeling or scraped up reflector tape making my spokes look all tattered. Bill did a few and got help with more, and then took a pack home to keep working on the project. I would like to find longer covers – they seem to come in this standard size of 3 inches and so you need multiple tubes per spoke. How much easier if they were longer! Let me know if you find a good source for these.

    manual chair wheel with small reflector tubes that pop on over each spoke

    A lady I met at the season opener for Philhamonia Baroque took my flyer and, fabulously, showed up with her husband and her very snazzy European style walker. She did a great job installing an LED strip set, and got a tuneup and some bolts replaced on her walker by Vince. I think that was true for others as well at the workshop.

    A lady smiling proudly as she shows off her newly illuminated walker with spiral light strips attached.

    Of course, one of the goals of our workshop was to let people know they can use ILRCSF’s free repair program! Marisol also led several people on tours of the Nick Feldman Lending Library where you can borrow all kinds of useful gear, try it out to see if you like it, or just keep it while you need it and return when your circumstances change. I have used this program in the past and it was incredibly helpful.

    We had so much lively discussion during the workshop. Gear reviews, complaints about what doesn’t make sense about either the DME industry, health issues and health care of course, Right to Repair laws now in play in California, and plain old brainstorming about future events. I was so pleased that everyone wanted MORE hands on, DIY events in the future!

    The whole event was a lot of fun. We had planned for 2 hours, but ended up staying for over 3 hours. I think next time we will try to get more helpers – because modding any assistive tech is so individual and needs individual attention, brainstorming, experimentation, and so on! And, we could try for an entire afternoon or spanning late afternoon and early evening.

    Some participants want to volunteer for our next event! That may be in December or January and will likely add some other category of modification — I’m thinking about pouches and cup holders as our next focus. They are simple, and everyone wants them, but figuring out what exactly will work for a person and their device is a complex process. It may end up being clamps like the motorcyle and bike ones we had for our Halloween workshop, or it can be something like fabric, leather, canvas, or even duct and gaffer tape along with velcro. Leather working tools can also be super useful in creating custom pouches and bags to attach to a chair!

    We will also be looking in future to host similar workshops in the East Bay jointly with the CIL and other organizations! Stay tuned!

    Here’s a few more photos:

    Me and Deniz in conversation,
    smling woman with halloween party hat, liz grinning, with wheelchair in flames tshirt

    Walker DIY in progress,
    walker diy in progress, a seated lady with silver hair bending over her walker and its light strips with cable ties in hand

    Judy and daughter,
    Two asian american women smiling, one seated in powerchair with lights attached

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    California Right to Repair – SB 1384 Power wheelchairs – repair

    California SB 1384 passed and was just signed into law by the governor. This right to repair legislation is about powered wheelchairs in particular. In short:

    – The criteria have been broadened, or relaxed, for who qualifies as an independent repair shop for power wheelchairs;
    – “documentation, parts, embedded software, firmware, and tools used to inspect, diagnose, maintain, and repair the wheelchair” must be provided to “an owner or an independent repair provider for the purposes of providing service on the equipment”

    This is great news. It should be helpful for us (the disabled powerchair owners) to fix, or get our chairs, fixed as quickly as possible! Thanks to all the advocates out there who worked so hard to get this made into law.

    Honestly, it should also be great news for the wheelchair manufacturers. They now have extra incentives to plan and design for maintainability of their equipment. I hope they have been following along with the legislation and are prepared to do that. The result will be that their customers will be a lot happier!

    And I am loving the details in this bill about firmware and diagnostic tools – two things that I’d like to have for my own chair that have previously been refused to me by the manufacturer. It may be a battle over what they will hold back as a trade secret, but at least we have a starting point for that battle.

    It also includes:
    (1)Batteries.
    (2)Battery chargers.
    (3)Nonprogrammable joysticks.
    (4)Joystick housings or brackets.
    (5)Wheel assembly.
    (6)Nonpositioning accessories.
    (7)Antitip devices.
    (8)Armrests, excluding positioning components designed for adjustment by a therapist or assistive technology professional.
    (9)Caster spheres.
    (10)Cosmetic shrouding.
    (11)Floor mats.
    (12)Floor plates.
    (13)Nonpowered leg lowerers.

    Here’s the text of the bill: https://digitaldemocracy.calmatters.org/bills/ca_202320240sb1384

    And here is a PDF with some extra analysis from earlier this year: https://apcp.assembly.ca.gov/system/files/2024-06/sb-1384-dodd-apcp-analysis.pdf

    motor controller diagram for action arrow wheelchair
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