Abstract: Ventilator for roof or other wall of a vehicle in which an opening in the wall is normally closed by a closure member and the closure member is connected to the wall at each of a pair of opposite sides by a pair of spring-and-link assemblies enabling the closure member to be opened to any of five positions and yieldably held by spring force in closed and each open position. By mounting inside the spring-and-link assemblies a trim ring and coacting screen plate mounted respectively on the wall and the closure member, the ventilator is adapted to screen against entry of bugs or other foreign matter in all open positions of the closure member.

Abstract: A combined escape hatch and ventilator for a vehicle roof having a frame bounding its opening in the roof, a cover hingedly connected to the frame and normally limited in opening movement as a ventilator relative to one or more sides of the frame for ventilating an interior of the vehicle, one of the hinge connections being separable and formed of interfittable parts fixed respectively to the frame and cover and releasably connected by a latch pivotally mounted on one of the parts, the latch having a cam engageable with a lug on the other part for normally clamping the parts together and in an emergency enabling the parts of the separable connection to be disengaged and the cover swing about the connection on the opposite side of the frame for converting the roof opening to a fully openable escape hatch.