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.