Elderly people with Alzheimer’s Disease or dementia sometimes forget to use the manual brakes on their wheelchairs, which then fall out from under them when they try to stand or sit. When this was brought to the attention of crop farmer Jerry Ford, he decided to do something about it. His invention is a rather clever automatic brake system for manual wheelchairs. It’s even designed in a way that still allows the wheelchair to fold up for transport.

This portrait is just one from a series of videos and photographs about inventors by photographer David Friedman.