Looking for help to find a book I read maybe 30 years ago.
The main thread was about robots eventually taking control over man. There is a central leader robot who comes to power. The key fact I recall is that the robots bore an emblem of a stylised cog that they had adopted as their symbol.
There are also streamlined flying robots with tendril arms.
I think the same book contained a human character who spent a part of the story in suspended animation in a spaceship in orbit (around the sun or moon?), eventually being rescued and finding how the robots had taken control in the meantime.