| 摘要 |
<p>The invention relates to a projection screen assembly comprising a stand (1) in relation to which a housing (5) receiving a screen (6) coated on both sides can be turned out of a vertical inoperative position into a horizontal operative position, two different operative positions being provided, in each of which an outlet slot (7) in the housing (5) is disposed at the top and one of the two projection surfaces can be pulled out of the housing (5) to be directed away from the stand (1). In order that the housing (5) of such an assembly can be brought into the correct one of the two horizontal operative positions and thereby avoid damage to the cloth (6) forming the screen, the invention proposes that the mounting (4) consists of two parts (12, 13) which are connected by a hinge permitting pivotal movement about a pivot pin (15) parallel to the longitudinal axis of the housing (5) and of which the first part (12) is fixed to the housing at the side (11) thereof opposite to the slot (7) and the second part (13) is pivoted to the stand (1) about a horizontal axis (9) transverse to the pivot pin (15), that the slot (7) in the housing (5) in the vertical inoperative position thereof is disposed diametrally opposite to the stand in substantially one vertical plane with the longitudinal edge of the housing (5) and the stand (1), and that the two parts (12, 13) of the mounting (4) are operatively coupled by a drive (19, 20) which, on rotation of the housing (5) out of the vertical inoperative position (FIG. 1) into one of the horizontal operative positions (FIGS. 2, 3), necessarily causes the first part (12) to pivot to a position in which the slot (7) in the housing (5) is at the top.</p> |
