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Apply basic economics and ergonomic concepts to evaluate engineering applications Essay Example

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Apply basic economics and ergonomic concepts to evaluate engineering applications

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Such high costs prevent people from buying the wheel chair. Additionally, the design has no provisions for temporary storage of items by the users. It is also important to note that that the current design is not adjustable and hence limits mobility and comfort (Cooper, 2008). Conventionally, adjustability is important given that it allows wheelchair to be set-up for optimal propulsion efficiency, and hence lowers the risk of injury. Frames may be folding or rigid. Rigid frames tend to perform better when maneuvering. Folding frames are often easier to transport, although many rigid chairs can get to a very small size by removing the wheels and folding down the backrest. Based on the identified disadvantages, the paper proposes a number of modifications to make it better.The cabin will allow the wheel chairs users to temporary store items such as files which may come in handy from time to time. They can also bring them along when they move and hence not need to go back to a table to get them each time they need to use them.Using block metals instead of wire spikes increases the overall cost of wheelchair tires and hence the cost of the wheel-chair. Replacing this wire spikes, similar to those used in conventional bikes can marginally lower the overall costs of the wheel-chair.Pushing, maneuvering and handling of clients in manual wheelchairs are largely associated with musculoskeletal injuries. Multiple researchers have reported increased risk for staff when pushing bariatric wheelchairs as a result of increased size and weight of not just the wheel chair but the users as well (Fitzgerald, 2001). Some of the potential risks associated with wheel chairs include;The final proposed design is a folding cross-brace frame style measuring 18x18 in terms of seat depth and seat width. The leg rest angle is set at 60 degrees. Further, there are 15 degrees of back-rest angle adjustment from vertical position. The seat dump allows for adjustment from horizontal to 7 degrees below horizontal through change of axle position. The rear axle has 8 probable positions which range from 3.75 inches front to back and 1.5 inches upwards and downwards. The caster angle is adjustable 10 degrees from vertical position in order to keep caster stem in a direction perpendicular to ground. The footrests can be moved to 3 positions with a range of 3 inches.The materials manufacturing processes to be used in

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References

Cooper, R.A. (2008). Wheelchairs: A Guide to Selection and Configuration. Demos Medical Publishers, New York, NY

DiGiovine, M. M. (2010). User Assessment of Manual Wheelchair Ride Comfort and Ergonomics, Archives of Physical Medicine and Rehabilitation, 81, (4), pp. 490-494

Fitzgerald, S. G. (2001). Comparison of Fatigue Life for Three types of Manual Wheelchairs, Archives of Physical Medicine and Rehabilitation, 82 (10), pp. 1484-1488

International Standards Organization (2004). Committee draft ISO/CD 7176-8(E) Wheelchairs- Part 8: requirements and test methods for static, impact, and fatigue strength. Technical Committee 173, Sub-Committee 1, N 200, Zurich, Switzerland

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