Hey Ray,
A couple of things from the start. Who is this invention going to help. Who will benefit from the invention, R.O.I. etc. Go to the people who will benefit and look for an angel who will be reasonable with regard to the amount they are willing to share with you.
Do you need a prototype made, very expensive, how about manufacturing, will production have to be set up or is it something you can have made by the home industry people, sewing, knitting, copying, or even light mfg. in someone's garage. How about the disabled folks, could they build it for you. To many questions to answer with so little information. That is why you need to talk to someone who will listen and give you advise without stealing your idea. Maybe SCORE will listen. Try some things. Jon. A. Holmquist