| 摘要 |
A hinge comprises a first link having a first toothed cog-wheel at a first end and a second link having a second toothed cog-wheel at a first end. The first and second toothed cog wheels are rotatably mounted on a base unit and meshed together. The hinge supports a vent between a closed position in which it lies within a fixed frame and an open position in which it extends at an angle to the fixed frame. A vent arm is attached to the support track via the first and second links. The incorporation of toothed cog-wheels allows the hinge to move in a smooth and predictable manner. The hinge can be arranged to provide minimal obstruction when the vent is open so that a user can have an unobstructed view out of the vent opening and the vent opening can be used as an escape route in an emergency situation. |
