Sounds like your describing an integrated manually powered version of the Roby Stair Climber. You'll need to integrate a tilting feature on the tracks to keep the center of gravity above the track system (like shown in the Roby brochure).
http://www.savaria.com/_files/file.php?fileid=filefRyJyeSyuO&filename=file_Savaria_Roby_system.pdf Steve Tyng On Tuesday, April 22, 2014 10:48:14 PM UTC-4, Maniac08 wrote: > > Actually Neil it will be a type of medical device to help a wheel chaired > person go down the stairs in an emergency situation. We are using a track > system to enable the user to do so. We are not actually building an RC > tank. I am sorry if this forum is only for rc tanks, but I did legitimately > have questions on how you guys go about choosing your type of track system. > > Here is the low down on our project. We are building an attachment to a > wheelchair to help the wheelchair population travel down stairs during > emergency situations by themselves. All products today require the > assistance of others during emergencies and we wanted to make wheelchair > users more independent. So the track system will be engaged with the large > wheels of wheelchair by way for chain and sprocket. So as the user drives > with the big wheels the tank tracks should move with them also. We are > including a sort of bike gear system to chain and sprocket so the wheels > can be easier to turn or harder to turn depending on the speed the user > wants to go. But we had limited the max speed to 5mph for safety reasons. > Our wheelchair does not need to go up the stairs yet, we want to deal with > going down first. Maybe after securing that function we can incorporate a > motor to help user go up also. A normal wheelchair has max weight of 250lbs > and wheelchair has a weight of approximately 50lbs with the footrests. So > in turn the tracks will need to hold about 300lbs. If we are able to build > a working project. I would gladly share the images and designs with you. In > addition also mention you as an advisor in our presentation. > > The reason we wanted tracks is because we desired as much possible surface > area with the ground as possible during descent in order to stop slipping > or tipping over of user. The best way my group believed for this to happen > was a track system. I am in charge of finding a suitable track system for > our project. I came across your website and was hoping to get some tips and > opinions on the type of track we should use. We planned on using the ones > made by the rc robot war websites, but found out they were too expensive > and pushed us to find a more cost-effective solution. > > The tracks will be inside the wheelchair frame. Which is roughly 23 inches > from the back of the wheelchair to the front. Then 17 inches from large > wheel to large wheel. We were hoping to use sprockets of 2-3 inch diameter > as we have only 18 inches from bottom of seat to floor with a crossbar > being in the middle. > > > On Sunday, April 20, 2014 10:41:23 PM UTC-7, Maniac08 wrote: >> >> Hello All, >> >> I would like to ask some of you experienced rc tank builders for advise >> in a project where I will be using a tank track system. I'd just like to >> procure some research before choosing which type of track system to employ. >> I found your group through this page: >> http://www.rctankcombat.com/articles/track-systems/ . I am given a >> budget of only $400 and buying a customized track tread from the rc robot >> companies is just way out budget. I would like to use one of the systems >> found in page mentioned before. My device will need to be able to handle a >> load of 300lbs and travel down any type of staircase: cement, wooden, tile. >> It needs to be able have enough friction so that the speed of device will >> only reach 5mph and be able to stop while angled on the stairs. I'd like to >> ask you wise gentleman your opinion on which track system I should use and >> why. >> >> Appreciate all your input and expertise, >> Maniac08 >> > -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
