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PROJECT 2
STAIR CLIMBING WHEELCHAIR


This project aims at making a stair-climbing wheelchair. The basic mechanism is similar to the mechanism of scepter. However a number of improvements over the basic mechanism have also been conceptualized. One of them is, the legs will rotate in an Elliptical path (to cover a larger height in comparison to the length travelled by the legs) instead of the circular path, as it is doing in the Scepter. This modification had to be made, since the real steps are almost square and hence the scepter cannot climb them easily. Scepter is limited to rectangular stairs. Many other improvements are also being tested and will be implemented in the final model. In the final model, the weight of the person sitting on the wheelchair, will be swung to make the climb easier. Its position will continuously varied, so that the center of gravity of the wheelchair is always at safe positions. While climbing upstairs the seat will be swung forward, and while climbing down it will be swung backward, so that lesser energy is spent to roll the wheels over the stairs and to make sure that it does not topple. This is in accordance with a human climbing stairs. While climbing up we lean our body in the forward direction and while coming down, we lean in the backward direction. Two different models are presently under developement. One is a completely automatic model and another one will be manual. The automatic model will sense the stairs and their height automatically, and will take decisions itself. The models are being developed to the stage of Commercial production. Well presently the project is at hault due to loss of enthu.


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© - Subhasis Behera