I thought of that, but I don't know that this technique will prevent you from falling the one or two feet you might fall to hurt yourself on the stairs. Sure, it would keep you from tumbling all the way down the stairs, but I don't think that is enough.
But I feel obliged to tell about this, which has more than one difference from what you said. My first year in college I was
*running**up* tthe stairs, only wide enough for one person, narrower than the average basement stairs, holding on to both railings, when I missed a step and must have hung from both railings a bit, and I dislocated one shoulder. I hadn't done that before. I told myself I should learn to let go of one railing.
In the morning when joints are stiff I go down stairs backwards, also any time I'm carrying a load or are otherwise at risk. Backwards is always safer. If you do fall you don't have as far before you hit.
Here's a thought though. Handrails are usually mounted on the side, somewhere around 42 inches high. What if you added a set overhead? That might be much more secure. At least until you get to the point where a lift is the only solution.
I've never seen it done that way but it might work.
You need a chairlift. New ones start at about $7000. If you have to turn a corner then way more. Used ones are available if you look around, but the lift track must be modified to fit your stairs. There are left hand and right hand models depending on which side wall it needs to be located near. You really need someone who knows what they are doing, its not a DIY job.
I had to have one installed for my wife who was crippled in an auto accident. We got lucky and found a person who collects them from people who no longer need them or have passed away; and then sells and installs them for a modest profit. Used, it cost me $1580 installed.
They run off of constantly charged batteries, so still operate if the power goes out. The batteries will yield about 9 lifts if the power is out - so I am told.
The chair folds upward so people can walk by, however moving furniture or appliances by it is a non-starter unless your stairs are really really wide. Even folded the chair and track take about a foot of space next to the wall. So best take care of moving large items from one floor to the other before installation.
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