Troti-e (english doc)

Removable electrical assistance for wheelchair made with electric scooter
  • Difficulty : Moyen
  • Duration : 4 days
  • Budget : - 1000 euros


This tutorial describes the motorization of a wheelchair using an electric scooter.
This system is designed to offer light, practical, unmountable and low cost assistance.

Features include :
- use of commercial parts
- adaptable on any wheelchair
- easily mountable and unmountable
- adjustable flush angle for easy disengagement
- steering lock to allow the use of the assistance at the same time as the manual traction (thus without holding the handlebars).


Before tinkering with the scooter, it is IMPORTANT to disconnect the battery to avoid short circuits.
This tutorial is offered as is without any guarantees regarding the security of the device.

By understanding the designs, plans, components or assemblies related to My Human Kit prototypes, I understand and agree that any information or material indicated by anyone associated with a design team is released as is without any warranty of any kind and is intended to be shared for the purpose of replicating, modifying or improving the plan. I understand that these prototypes aim to develop alternative open source solutions for people with disabilities. I understand and agree that any person associated with My Human Kit could not be responsible for any injury or damage resulting from the manufacture or use of these prototypes.

Credits :
The first version of this prototype was designed by Jose Maria Arocena Arambur and was improved during Fabrikarium.

Team from Fabrikarium :
Jose Maria Arocena Arambur, John lejeune, Agnès Leclercq, Jérémi Calastrenc, Jean-Luc Minuzzi, Joël Douzal, Mario Zeny, Fabrice Vermande
Documentation Flossmanuals :


Step 1: Disassembling the scooter

- Disconnect the battery and the motor connector.
- Remove the battery.


Step 2: Making the fork adapter

- flat iron of 5x30mm
- adjustable stem decathlon
- two barrel screws 8 / 6X39mm

In order to connect the fork to the frame it is necessary to build an adapter piece.

Cut three pieces of flat iron and drill them according to the following plan:


Mounting the center plate and side plates

Mount the center plate on the stem with the original screws of the stem and the side plates on the scooter's fork head, with two barrel screws as shown in the pictures.


Step 3: Improve the hunting angle setting

The stem used provides an angle adjustment that can be used to adjust the tractor's hunting angle. This setting will act as a clutch, to quickly switch between manual and assisted mode.

An improvement is necessary to make this adjustment easier to set up during its use.


- adjustable stem
- a barrel screw ext 8 int 6 length 39mm
- two pen springs (or other of your choice)
- a quick coupler of saddle 50mm Decathlon (ref 374154)
- spacer (tube) about 10mm in diameter and 20mm long


Step 4: Installation of the quick couplers on the stem

Material :
- 2 saddle quick couplers 34.9mm Decathlon (ref 3640502)
- ball locks pins


Step 5: Directional locking device

Material :
- flat iron 22X1,5mm (154,5mm)
- 6mm threaded rod
- aluminum sheet 1.6mm thickness
In order to be able to run in addition to a manual propulsion, it is necessary to be able to lock the steering in the central position easily.

{This function should be developed.}


Step 6: Connecting tube

Material :
- 2 steering pivots diameter 1 1/8, length 300mm (ref xxcycles: 58055)
- 1 handlebar diameter 25.4mm, fork diameter 1 1/8, length 110, (ref xxcycle: 39680)

The fork will be fixed to the tube attached to the wheelchair.
These tubes are made with two bike steering pins (pivots) welded together at 90 °.


Step 7: Install the battery and the controller

Reinstall the battery and the controller on the fork to make it functional. The fastener must be solid and waterproof.


Step 8: Use

The whole system can be disassembled easily.