防撞设计

Wheelchair Handle Deterrent

2024-04-29 23:55:19

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Summary

Wheelchair Handle Deterrent

This is a 3D-printable device that you can attach to the handles of a wheelchair.
It prevents/deters people from grabbing the handles without your permission/consent.

If you don't care about customization and/or your handles are either 7/8" or 5/8",
there are pre-built STLs in thebuild/directory.

Authoritative links

Git repo
- This is the "canonical" source. I'll try to make sure Thingiverse matches, but it's a manual process.
Thingiverse thing

Manufacturing

This is intended to be FDM printed without supports.
0.2 mm layers with 15% infill and 2 walls should be enough. (If they break, they only become more effective.)
If you intend to leave these somewhere very hot, like in your car during the summer,
it's best to print these in a plastic with a higher glass transition temperature like ASA, polycarbonate, or ABS.
You may need to add tabs to the spikes, if you have trouble with them peeling off the bed.
It's not going to hurt the function of the part if the spikesdopeel, it will just be a cosmetic defect.

What if I don't have access to a 3D printer?

That's okay! Many libraries, universities, schools, maker spaces, and hacker spaces offer cheap 3D printing services.
A few internet searches should turn one up.
If that's not an option either, you can use an online manufacturing broker (list of examples below).
Just upload the.stlfile and select the material, quantity, delivery address, etc.

Make sure the units are correct and the part is the right size! (STLs don't contain unit/scale information.)
By default, this.scadfile takes input parameters in inches and outputs in millimeters.
So, unless you've changedscaleFactor, that should still be the case.

Instant-quote Manufacturing Brokers

Hubs(This is the one I typically use, but they have a high minimum order price.)
Craftcloud3d(cheap and no minimum order price)
Xometry
Protolabs
Fictiv
Rapid Direct
PCBWay
Fathom
Jaws Tec

Customization

The model is fully parameterized, so you can customize it however you like.
Realistically,ringIDis the only thing that may need tweaking.

Thingiverse

If running OpenSCAD isn't an option, you can customize the model online via
Thingiverse.

Currently, the Thingiverse customizer is broken by this design!
I'll try to fix it later. For now, you'll have to just use OpenSCAD.
Fortunately, that process is relatively painless (see below).

OpenSCAD

To customize on your local machine:

InstallOpenSCAD(available on all major desktop OSes).
DownloadwheelchairHandleDeterrent.scad
OpenwheelchairHandleDeterrent.scadin OpenSCAD.
Click "Window" anduncheck"Hide Customizer".
In the customizer, click the dropdown that says "design default values" and select your preference.
1. Alternatively, you can tweak each parameter individually, using one of the presets as a starting point.
Click "Design" then "Render" and wait for the render to finish. (This should only take a second or two.)
Click "File", then "Export", then "Export as STL".
1. This is the file you'll either upload to one of the instant-quote sites (see above) or open in your slicer.

Print Settings

Rafts:
Doesn't Matter
Supports:
Doesn't Matter
Resolution:
0.2 mm
Infill:
20%
Filament brand:
doesn't matter
Filament material:
ASA, PC, or ABS

How I Designed This

One of my Tumblr mutuals posted about someone who was selling a similar item, and how glad they were that it was available. However, they were unhappy about the lack of customization. I also noticed that they were heavily marked up, especially for a part that should require no post-processing. A quick search online didn't revealed one model, but it was just a raw STL with no way to customize it.

My hope is that these files will make this kind of device cheaper and more available to people with wheelchairs that have unusual handle diameters.

Custom Section

Please let me know if you end up using this, as it would make me very happy! Suggestions for improvements are always welcome. I haven't tried this on any wheelchairs. So, you may need to tweak theringIDto get just the right fit.