| 摘要 |
<p>A device for permitting controlled emission of a volatile substance, in particular an air-conditioning agent. The device comprises a container (1) having an annular ledge (2) with two recesses (3) on opposite sides and a frustro hemispherical hood (4) open at the top, that fits on to the container (1). The hood (4) has two studs (5) protruding on opposite sides of its inner wall and inside the hood (4), is situated two shutters (6) that are moveable in relation to each other on relative rotation between the container (1) and the hood (4) by means of slots (7), which are moved by the studs (5), to close or open the opening to an infinitely variable degree.</p> |
