Need to create a solidworks model of a foldable wheelchair for dogs

I am designing a wheelchair for handicap dog . I need a system allowing the cart to fold when the dog goes backward and unfold when going forward . A trigger system has to be created depending of the movement of the wheelchair So I need to see a working mechanism, a system that would work in real life taking in consideration the weight and the direction of the dog I don't need any details , just the basic line mechanic of the wheelchair in movement front ward and backward Here is a basic sample of the way it should be presented , but as a working mechanism going forward and backward [login to view URL] If the job is successful, I will need a more sophisticated 3D / CAD work so I can go into production If you apply for a fee, don't ask for more in chat