A wheelchair for dealing with trivial tasks

As other people, disabled people have to poo and clean themself. This wheelchair is not a panacea but it goes a little further than usual.

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Disabled people are (sometimes) not super heroes, they need to defecate or have their periods and they have to clean themselves.
Folks may have very different types of disabilities. While some can transfer themselves from a bed to a chair, this is impossible for others. Some disable people can go outside, but others are confined in little space and have to rely on other people to carry them to toilets and to clean them. I do not need to go further, you can imagine by yourself what it implies and what it means for the ego.
This project designs a wheelchair that is intended for people who are not able to transfer themselves on a toilet seat. It may be unfit for other use cases.
This wheelchair can go over a toilet seat, the chair's arms motors can uplift the person on the chair to make it possible for her to:
1) Make the cushion split in two
2) Remove their clothes
3) relieve and clean herself when she is done.

The outcome may be a wooden proof of concept.

This project is to make a CAD model of an electric wheelchair that is intended for disabled adults who are not able to transfer themselves on a toilet seat.
In order to make it possible for the disabled person to defecate on the toilet seat, she position the wheelchair over the toilet seat and push a switch on the end of the wheelchair arm (left or right, it does not matter much).
The person will have put her arms over the wheelchair arms.
Activating this switch will make two hydraulic cylinders to deploy and each to push on one arm. Each wheelchair arm will in turn uplift the person by pushing one of her armpit.
Once the person is uplifted by 4 centimeters, the cushion under will split by the middle in order to make it possible for the person to defecate through it.
The person will remove her clothes as she has her hands free even if it is quite uncomfortable because of the pressure of the wheelchair's arms.
Once she is done, she switches off the uplifting mechanism, the cushion returns to the normal position and the wheelchair's arms go down.

So one important point is that there is enough place below the chair to host the toilet's seat. It means there is a void at least as 47cm high and 40cm large below the buttocks of the disable person.

Wheels must able to let the wheelchair going straight to the right without maneuvering (Rotocastor like multi-directional wheels?), and then going backward, all this without needing any room for a turning circle. Wheels must not be separated by much more than 50cm.

What is expected is to create a CAD model of this electric chair. We must take care to the mechanical characteristics, for example the battery must occupy a reasonable volume for 24 V and 20 A/h.
The wheel motors, and the cushion motor, each uses 250 W.
The overall length is 96cm, but could be reduced to 79cm, the overall width is 58cm, the usable width is 53cm, the person max weight is 150 kg.
The seat depth is 43cm, the cushion height is at least 3cm.

The CAD model is expected to be finished in mid September and it will be open source the same day if it complies with my requirements.

  • Further ideas

    Jean Pierre Le Rouzic09/02/2017 at 08:18 0 comments

    While waiting for an answer from one of the Freelancers that declared an interest in my proposed task, I thought that something is wrong in the way the wheels are usually designed.

    It seems to me that all wheelchairs are designed to go along a straight line, and that they are not designed to maneuver in cramp places. Regulations for disabled toilets ask for a width of 1.5 meters which is much larger than most toilet rooms.

    In the place where I am writing this piece, accessing toilets with a wheelchair is impossible because the short hall to the toilet room is 85cm wide, the toilets door is 80cm large and the width of the room is 85cm but a wheelchair cannot engage completely over the toilet seat.

    So wheels must enable to go straight to the right, and then go backward without needing any room for a turning circle. And because the obstacle wheels must not be separated by much more than the overall width is 50cm.

    I noticed also that my wheelchair overall length should be less than 80cm and not 96cm as I stated initially, if I want to be able to go through the toilet door in a starboard displacement.

  • Only three days left and still it is the first day of the project!

    Jean Pierre Le Rouzic09/01/2017 at 21:46 0 comments

    I searched for diagrams, sketches or CAD files for a real wheelchair and was very surprised to find none that were usable without huge work. 

    So I will ask for  a Freelancer to write a CAD file for this project. The file will be open sourced.

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Jean Pierre Le Rouzic wrote 09/03/2017 at 12:14 point

Thanks you so much Muriel.

  Are you sure? yes | no

Muriel Green wrote 09/03/2017 at 11:38 point

What an admirable project! 

  Are you sure? yes | no

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