| 摘要 |
PURPOSE:To obtain a better operational feeling by constituting aggregate sheet air guiding members so that condition of contacts between individual sheets is kept unchanged by keeping the space distance where the said sheets are sandwitched unchanged regardless of the direction of an operation member. CONSTITUTION:In accordance with vertical, lateral and oblique movements of an operation knob 17, a driving pin 19 swings about a center of a support hole of a fixed sheet 13. With this movement, air flow guiding members 12A and 12B placed respectively in front of and at the rear of the fixed sheet 13 swing relative to a fixed plane of the fixed sheet 13, and individual sheet 3 shifts so that air flow guiding openings A are directed to a specified direction. At this time, a back retainer 14, though it moves laterally, does not move in back-and-forth directions. Therefore, the distance occupied by the air flow guiding members 12A and 12B as well as the fixed sheet 13 (or the distance between a planar grill 16 and the back retainer 14) remains unchanged so that the aggregate sheet bodies 12A and 12B are not squeezed when the operation knob 17 is tilted.
|
