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Saturday, May 22, 2010

A Rickshaw Trike: Part 3

Today was Saturday and I had a chance to work on the Cyclo cycle-rickshaw. The aim was to get the trike going with a retro-direct 2 -speed drive. (see I'd already mounted an extra clutch on the rear sprocket and the cycle already had a place to mount the pulley and I had a ball bearing mounted pulley in the shed. So it didn't take all that long to put it together.
Christine was ready for a ride in the trike by the time I'd fitted up the chain and pulley, so the first ride wasn't a blockey but a "real ride" up to a cafe / nursery and bike shop. The gears worked quite well and it was relatively easy to get used to pedalling backwards to go forwards. The trike has an inbuilt park-brake: just park it pointed up a hill and it won't go anywhere as it can't roll backwards.
I made a short, fairly crap video of the mechanism. The sound effects include the guy next door putting out the rubbish bins and I am decapitated for much of the video. See . That's Showbiz or at least my version of it!
Before I put this drive on our rickshaw I searched the internet for "retro-direct rickshaw" and came up with this site which links to a video of a delta trike rickshaw in Bangladesh with retro-direct drive . I had a brief internet conversation with the site's author.
Well I'll go on improving this trike. The bracket holding the pulley needs to be a bit more secure and be constrained from moving sideways but major improvements will only come when I increase the number of teeth on the chainwheel and clutches (reducing the forces in the chain) and get the driving ratios a bit better. For this I need to remove the several screw on clutches from bike wheels which is "difficult", so I'll see how it goes.
Steve Nurse

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