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Making of wheelchair ramps: Permanent galvanized and portable aluminum by Rory H. Hawkins

Wheelchair ramps have proved to be of great benefit to the wheelchair users for their easy accessibility of moving the wheelchair from one height to another. To shape the move in the finest possible way, the wheelchair ramp companies have really come up with a range of innovations in the designing of the ramps.

One way of dividing the wheelchair ramps is by the category of its usage. More specifically the designing is done taking into prior condition how the ramp will be used. Is it only for a manual wheelchair to move within the limits of a household or is it also for an electric wheelchair to be moved from place to place? For the former one, a threshold wheelchair ramp is enough but for the latter you will need a track wheelchair ramp.

There is also a different way to look at the whole thing. This is more concerned with the making of wheelchairs or in other words the raw materials used to manufacture the wheelchairs. But this is in no way alienated from the purpose because whatever way the wheelchair ramp is made of, it must be able to cater the need of the users. The prominent divisions are galvanized wheelchair ramps and aluminum wheelchair ramps.

Permanent and hardy are galvanized wheelchair ramps

This particular type of ramp for the wheelchairs is generally installed in permanent positions where the wheelchairs are made into large use. One prominent example can be the hospital or any home for the disabled. In these places temporary ramps used and then removed are pretty difficult to be handled. Who will do it every time? Therefore you have to go for a stable and permanent solution and that can only be provided by the galvanized ramps.

Galvanized ramps begin with the capacity of carrying 1500 pounds at a time. The minimum width is around 37.5†and that can be at ease stretchable to 48-50 inches. For the convenience of movement and to give support to the larger width, handrails are fixed from both sides. Therefore there is hardly any chance for an accident to take place.

Aluminum wheelchair ramps for easy moves and transportation

An aluminum ramp is more like a little instrument you can carry anywhere and everywhere and use it whenever you need. Aluminum ramps can be expanded and folded and moreover the parts can be altered. Most of the wheelchair ramps that are portable in nature are made of aluminum. The single folded, the double folded, the modular ramps †all are made of this metal.

These ramps have specific foot sections such as six foot or eight foot. As the metal is a light element the ramp is also not at all weighty but it is quite efficient to carry weight on it. If not heavier as 1500 pounds carried by a galvanized ramp, the aluminum ramp is enough to carry one wheelchair easily at a time. This is exclusively designed for individual purpose. Do you still seek something more?

Rory H. Hawkins writes about on Making of wheelchair ramps: Permanent galvanized and portable aluminum to visit :- wheelchair stair lift, seat lift electric wheelchair and wheelchair lift vans

Article Source: http://www.earticlesonline.com/Article/Making-of-wheelchair-ramps--Permanent-galvanized-and-portable-aluminum/80589

An aluminum wheelchair with rider has a mass m=130kg and is half way up a ramp that is tilted at an angle of 2?

4.Which forces are acting on the wheelchair with rider.
a.Weight
b.Tension
c.Normal
d.Spring
e.Friction
f.Air Drag
g.Magnetic

I think the forces are weight, normal, and friction.

5.Draw a free body diagram.

6.What is the magnitude of the gravitational force component ALONG the ramp (i.e., NOT horizontal, NOT vertical, but along the path of the chair.)

7.What is the magnitude of the gravitational force component NORMAL to the ramp (i.e., NOT horizontal, NOT vertical, but pushing the chair INTO the ramp.)

8.What is the NET force on the chair? (Magnitude and direction)

9.What is the minimum the coefficient of static friction (wheel to ramp) needed if the chair is not moving because of that friction?

The forces seem ok.

Remember to draw the friction force as acting UP along the ramp.

Gravity force component down along the ramp is mg sin ø

where ø is the angle you have called "2"...... somewhat unlikely.

Gravity force into the ramp = mg cos ø

The chair is not changing velocity so the net force on it must be zero.

Friction force = µ . mg cos ø

Friction force = downslope gravity force

µ . mg cos ø = mg sin ø

µ = tan ø

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This entry was posted on Tuesday, October 21st, 2008 at 12:50 pm and is filed under Medical, Mobility and Special Needs. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.