You have just reasonably well described the rolling block action.
If you do a search on Remington Rolling Block you will find a lot of information on the strong American design. The European Flobert rolling block works the same way but is dinky and flimsy. Why, it might even blow open when shot with ammunition more powerful than what it was made for.
PetaW shows the Warnant design of Flobert which is an entirely different thing.