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Hi @mossycow and @Mr_Ry
Thank you for your replies its much appreciated.
I am a new thread maker however I work closely with Alex who I believe has posted a similar thread with has been really insightful for us. However the reason why I have posted another thread is because I wish to learn more about some of things you have highlighted mossycow. Particularly how we could tackle how to reduce upper body pain and gain more efficiency of arm energy to chair movement.
I have read through several research papers on the short and long term physical effects of using a self propelled wheelchair and the disadvantages of using a push rim. Through my research I have found several ways people have tried to tackle these problems using a lever propulsion system (http://www.mobilitycare.net.au/buy/nudrive-air/) which is designed to spread the energy needed to the back and chest muscles, a much larger muscle group then the arm muscles.
However this brings me onto the next point with is cost. These lever propulsion systems cost several thousand pounds which is just an extortionate amount. I believe cost shouldn't be a barrier in helping people feel more comfortable in a wheelchair which is why I wish to design something which can be open source and free for anyone to download the plans off the internet.
3D printing over the past few years has become a lot more accessible allowing people to send files to local workshops to build parts at a much lower cost. Taking this into consideration I believe it is very possible to design a lever system with a 3D printer friendly mechanism with doesn't use a complicated ratchet like the thousand pound products out there. Meaning the final designed product would be low cost, accessible for all and help distribute the work load across the upper body relieving pain and making the user feel more comfortable.
I have thought of several ways to achieve this which is why I would love for the community to help me with this project. I have drawn up some designs and would be very grateful if anyone would wish to meet up and have a discussion about the project, helping me highlight areas I would need to look at to create a successful design.
I currently live in Kings Cross London so would be happy travel to you or pay for your expenses to Kings Cross
If you both have any questions or if anyone else does please don't hesitate to ask.
Many thanks again
Tom
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