Patent ID: 7328672

Claim:
An engine comprising: a first end wall portion; a second end wall portion spaced apart from the first end wall portion to at least partially define a pressure chamber therebetween; a first movable wall portion operably disposed between the first and second end wall portions, the first movable wall portion being pivotable about a first pivot axis and having a first surface facing at least generally toward the pressure chamber; a second movable wall portion operably disposed between the first and second end wall portions adjacent to the first movable wall portion, the second movable wall portion being pivotable about a second pivot axis and having a second surface facing at least generally toward the pressure chamber; a third movable wall portion operably disposed between the first and second end wall portions; and a synchronizing apparatus operably coupling the first movable wall portion to the second and third movable wall portions, the synchronizing apparatus causing the first and second movable wall portions to move in unison as the first movable wall portion pivots about the first pivot axis and the second movable wall portion pivots about the second pivot axis.