Abstract: A slide magazine for slide frames having a peripheral edge with a peripherally extending groove on the two faces thereof and a notch at at least one edge portion of the peripheral edge, comprises a base portion with longitudinally spaced pairs of transverse rib portions. The rib portions of each pair are disposed in alignment transversely to the base portion and each pair is spaced from an adjacent pair to provide a slide frame-receiving compartment. The rib portions carry retaining ribs to hold the respective slide frame in a spill-resistant manner in the slide magazine, and each rib portion further has a projection for engaging into the groove to hold the respective slide frame in its compartment. A resilient finger in the base of each compartment has a retaining nose to engage into the notch of the slide frame to hold it in position. Slide frames can thus be inserted into and removed from the slide magazine at both sides thereof.

Abstract: A slide magazine has a base portion and partitioning walls which project upwardly away from the base portion at mutual spacings to form compartments for accommodating respective slide frames. The partitioning walls are of a height which is adapted to the slide frames and at their ends remote from the base portion are connected together by a strip-shaped holding portion extending over the length of the slide magazine so each compartment can be loaded and unloaded from both sides. To prevent the slide frame in a compartment from falling out laterally, provided at each side of each compartment is at least one resilient retaining portion in the form of a resilient finger with a retaining nose arranged to engage the slide frame.

Abstract: A projection screen arrangement has a housing mounting a rotary roller for winding in and unwinding a projection screen. A rotary knob which is actuable from the outside of the housing is non-rotatably connected to the roller for tensioning the projection screen in the extended position, while a terminal bar member is provided at the end of the projection screen remote from the roller. A push member is mounted for radial movement in the housing and is adapted to be actuated against a spring loading by the terminal bar member when the projection screen is fully wound into the housing. The push member displaces a detent member which co-operates with a further detent means which is non-rotatable with respect to the rotary knob, for locking the roller in the winding-in direction, whereby the winding of the projection screen on the roller in the fully wound-in condition can be slackened, without the spring loading the roller in the winding-in direction re-tightening the projection screen wound on the roller.

Abstract: 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).