Frame for transparency, with two rows of perforation holes on long sides

摘要

The teeth (9) of the tooth strips (8) engage in the perforation holes (4) of the framed transparency (2). At least one tooth strip is movably arranged vertically to the row (5) of perforation holes and at least one spring is provided, under the effect of which this tooth strip is pressed outwards in relation to the framed transparency. The frame transparency is thus subjected to a lasting tractive tension perpendicular to the row of perforation holes. Both tooth strips are movably arranged vertically to the row of perforation holes and under the effect of the at least one spring both are pressed outwards in opposite directions in relation to the framed transparency.