Ventilators and/or windows for vehicles

A ventilator for a vehicle comprising a frame adapted to bound an opening in a vehicle roof, a panel, two pairs of support arms, each pair supporting the panel on the frame at a respective one of two opposite ends of the frame, each support arm being pivotally connected at one end to the frame and at the other end to the panel and being provided with spring-loaded detent means at one or other of said ends for holding said arm in any one of a plurality of angularly-spaced positions, the pivotal connection at the end opposite to the detent means of each of said arms comprising a pin which projects through superimposed openings in the arm and a member to which said arm is connected, a boss in which the pin is axially movable and a spring which engages between the pin and the boss so as to clamp the member and the arm together between a formation on the pin and the adjacent end of the boss.