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Please help ...Thanks a lot...
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Posted by: sporty

10/29/2010, 08:57:29

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I am trying to add some linkage bar or gear mechanism to a wheelchair which can use to rise or lift the patient to the half standing position. This is to help the patient to stand up from a wheelchair by himself witount using motor or any circuit. To rise the body weight by using hand force is it possible? Can any one provide me the draft of that mechanism design?

Thanks a lot...i am just a begineer, hoping people may share their idea to me..thanks
the person on the wheelchair is able to stand up,because they are only temporaly use the wheelchair like the people suffer from the accident or elder men or women in home, due to their leg is not able or no energy to stand directly from sitting . SO wish to lift the rear seat to make it in tilt position so they can easily stand up and use walker to walk.
I have draw the draft but i think the linkage is not good enaugh to support and lift the whole body weight by a hand push force.
the draft link,

h

And thanks for your reply , help, and your idea...i wish to make a middle complexity mechanism with small forces to rise himself or herself up








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: Please help ...Thanks a lot...
: Please help ...Thanks a lot... -- sporty
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Mechanical Engineering Forum
Posted by: rwolfejr

11/12/2010, 13:52:29

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You need to start your line of thought with the idea that you will need some mechanical advantage for certain. Then you'll need to decide on about how much advantage on what average weight. Then I picture this mechanism will need to lock at both the up and down position and then be easily unlocked to move it either way.

Drawback of any sort of mechanical advantage I can think of is the loss of motion or basically to have an advantage you have to put in more distance than you'll get by whatever factor you choose. Looking at it linear... if you want to move the butt 10 inches, you'll need to turn the crank or pull the lever 20 inches to cut load in half-ish.

Right off... I picture one or a pair of levers at the side of the seat that are forward. When you pull back (natural direction to try to lift yourself up) ...when pulled back the seat rises. Under the seat and attached to this lever you have a toggle arrangement that provides the advantage. Once up you'll need to be able to have a catch that can be latched hands free or from that same motion of the lever... and then able to release reversed.

Maybe a ratchet set up like a come-along? Pulley / pulleys at the back of the chair to raise the back of the seat with a cable running to a crank at the side etc...

Good luck...!
Hope that gave you some direction or maybe spurred some other ideas for you.
Bob








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