We have a relatively small kitchen and having appliances like the microwave on the benchtop takes up space all the time when they're not being used. What I'd like to do is build some pull-down shelves that normally sit high up but can be pulled down and locked when in use, preferably with a spring, pneumatic or similar mechanism so they will return to the high position when unlocked.
I've tried searching online but only found pull-down-and-out shelves that are designed to be mounted inside a cupboard (e.g. Rev-A-Shelf). Can anyone recommend any alternatives, either complete systems or parts that I could use?