Patent ID: 7163037

Claim:
A refueling closure assembly for use in a capless filler tube with a nozzle receiving aperture for a fuel tank comprising: (a) support structure with portions thereof defining a first and second set of spaced guide surfaces; (b) a closure door with a seating portion configured for closing on said aperture and with a first and a second set of spaced follower surfaces engaging said first and second set of guide surfaces, wherein said first and second set of guide surfaces are configured such that, upon progressive insertion of a refueling nozzle through the nozzle aperture said door is caused to first move in translation away from said aperture then rotate and move to an open position substantially not obstructing said aperture; and, (c) spring structure operative, upon insertion of said assembly in said filler tube, for biasing said door in a direction toward closing on said aperture.