![](https://s3images.coroflot.com/user_files/individual_files/585147_ghunbi3aewtxt8_0nr7fvbwlc.jpg)
Isometric view of hand-cycle design with user.
![](https://s3images.coroflot.com/user_files/individual_files/585147_f4wkwfkhpqgulny4gwb6tlqvw.png)
Dimensions of the proposed hand-cycle in inches.
![](https://s3images.coroflot.com/user_files/individual_files/585147_0yrpurl3vr96gktirtcwazngr.png)
The pedaling mechanism used for this design was developed by a team at the University of Wisconsin-Madison, under the direction of Dr. Frank J. Fronczak.
![](https://s3images.coroflot.com/user_files/individual_files/585147_yazh0zpe6rxedhbowpl3ikvk2.png)
This pedaling mechanism design allows the rider to use larger muscle groups to pedal, permitting longer periods of use with more efficient energy expenditure.
![](https://s3images.coroflot.com/user_files/individual_files/585147_jpptiumhsuu6u2pfvt0fk6l4e.jpg)
The wheel configuration of the Wisconsin-Madison design had a large turning radius, which limits the mobility of the user.
![](https://s3images.coroflot.com/user_files/individual_files/585147_3njiy9r0ktmg2garj4wqehyj4.jpg)
I wanted to maximize the usability of the hand-cycle. In order to achieve this, I proposed the configuration shown here, which dramatically reduces the turning radius of the vehicle.
![](https://s3images.coroflot.com/user_files/individual_files/585147_mv4y7qekzvegtgk30bv2vmjmf.jpg)
The frame for the hand-cycle was designed from commercially available Al 6061-T6 tubing.
![](https://s3images.coroflot.com/user_files/individual_files/585147_c7bdjgtyxb4fjuigipxbe5ax_.jpg)
FEA was used to verify the integrity of the frame design.
![](https://s3images.coroflot.com/user_files/individual_files/585147__hdrxngdtquofsjzsn2tszk9m.jpg)
Steering is achieved using hydraulic actuators. These are moved using a swivel mechanism at the hand interface.
![](https://s3images.coroflot.com/user_files/individual_files/585147_xzkckplyg8t8jh3sigldbpg7b.jpg)
Actuators mounted at the steering column apply the force that is input at the hand controls.
![](https://s3images.coroflot.com/user_files/individual_files/585147_hkjmlrbp929ookncwcfxrspy6.jpg)
A rear transmission was designed to allow independent wheel engagement, and inversion of the freewheel mechanisms. This was hydraulically operated as well.
![](https://s3images.coroflot.com/user_files/individual_files/585147_cv59faunalolhg2zucwdl2na9.jpg)
![](https://s3images.coroflot.com/user_files/individual_files/585147_holq9z65elasv5antzxdqy00e.jpg)
Detail view of freewheel engagement mechanism.
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