Wednesday, June 24, 2020
Where is the Drive Wheel and Why Does it Matter?
The drive wheel on a power wheelchair is the larger wheel if you are looking at your wheelchair or client’s wheelchair. The location of this drive wheel can have a large impact on how the power wheelchair drives and manoeuvres in different environments.
There are three main types of drive wheel configurations on power wheelchairs: front-wheel drive, mid-wheel drive, and rear-wheel drive. In this blog, we will focus on front-wheel drive.
The front-wheel drive power wheelchair is typically going to be good for manoeuvrability indoors and optimal for outdoor use. This is because of the larger drive wheel being the first wheel to overcome the uneven terrain versus the smaller casters. Because the front wheels are connected to the drive motors, these pull the casters over obstacles and through various terrains versus if the casters were the front wheel. In the case of the casters being in front, the casters are being pushed, the force generated is forward and downward. This would be similar to a ploughing effect and can increase the likelihood of becoming stuck in certain situations. For individuals looking to go over all terrains, the front-wheel drive wheelchair may offer the best solution.
Another benefit of front-wheel drive is the smoothness of the ride. Look at how many wheels are on the ground. In the case of front-wheel drive there are four wheels versus the six wheels with a mid-wheel drive chair. This means that as the end-user goes over a bump in a front-wheel drive chair, they would feel the force of that bump two times versus three in a mid-wheel drive. This can also be important for individuals that may easily lose their positioning when going over any uneven terrain.
We could talk about front-wheel for hours, but the final benefit to mention is the front-wheel drive chair’s smallest front turning aspect. In all the configuration options, the chair will turn on its drive wheel.
The photo below shows an example of a bathroom. In this bathroom the sink is positioned against the wall. Because the wheelchair turns on its drive wheel and the end-user can only pull themselves so close to the wall before turning, we can see the only chair to gain full access to the sink is the front-wheel drive. Does this mean that everyone should have a front-wheel drive wheelchair? No, but it does mean that it is important for clinicians, suppliers, and clients (end-users) to consider the environment that the client lives in.
Often, I hear that people stay clear of front-wheel drive because it doesn’t have as small of a turning radius as mid-wheel drive and it is harder to learn to drive. Both of those statements are true. The front-wheel drive will have a slightly larger 360 degree turning radius, but as you saw above it has the smaller front turning aspect which may be utilised more than someone turning in a full circle. Front-wheel drive may be less intuitive to learn how to drive versus mid-wheel drive, but with a little practice and a few key tips, many users find front-wheel drive to be just as easy to learn as mid-wheel.
The two key points I like to teach someone when learning to drive a front-wheel drive wheelchair is:
- Hug the corner. When going through a doorway the end-user will want to “hug” the corner or keep a tight turn.
- Turn towards the problem. For example, when positioned adjacent to a wall/barrier, turn toward the wall/barrier, then slightly reverse to allow the rear casters clearance for turning in the desired direction. This might sound complicated, but if you remember to turn into the problem you will easily manoeuvre away from the problem.
Keep in mind that not everyone will benefit from the same drive wheel configuration and it is important to ask the questions and complete an evaluation to determine which drive wheel would be best for you or your client.
Interested in learning more about drive wheel configuration? Join our Clinical Education Specialist, Rachel Maher this Thursday June 25th at 2.00pm for our free webinar.
Director of Clinical Education