Lawnmower with rotating blade housing

Inevitably when one cuts their yard there are objects that get in the way. Be it a mailbox, an umbrella, a toy the children left for dead., these objects cause cutting the yard more difficult. I propose that we give the blade housing the ability to rotate. Of course the blades would have to have the ability to rotate with the housing as well, other wise it could be messy.

I envision driving the lawnmower and running near the mailbox. Going slowly, the blade housing taps the mailbox post. This causes the whole housing section to stay stationary, but it is pinioned under the main chassis so the entire thing starts to rotate behind and under where I'm sitting (if it is the typical seated mower). I can't decide if the housing should be on a pneumatic arm that will push it back out, or get pushed to a spring to bounce it back out, or even be put on some geared device so it will make a full rotation underneath me to go back to the 'normal' position. In any event, once I have driven past the object that caused the whole process the blade goes back to the 'normal' position and I can continue cutting grass like I normally would.

This device could increase the safety of having a mower, a lot less severed limbs. It would also reduce the need to edge as much, or at least make edging a much easier job.