| 摘要 |
The invention relates to a hatch, especially as a cover for flue gas vents in roofs, with an adjustable-height hatch cover, and proposes, in order to obtain a particularly efficient system, that the height adjustment is obtained by the longitudinal movement in oblique slide slots (8, 35) of lifting members (12, 32) on the underside of the hatch cover (6, 7 and 26, 27). The device comprises in particular two hatch covers (6, 7 and 26, 27) which can be moved up and down synchronously and in opposite directions and are allocated to the upper and lower edge of the roof vent (2 and 23) for the purpose of closing. |
