| 摘要 |
The invention concerns an apparatus in a slide projector with a vertically movable lens holder, extending through a vertical longitudinal opening in the projector casing. The invention is characterised by a frame (1) forming an opening (2) corresponding to the longitudinal opening in the casing's elevation, a main slat (3) fitted with an opening (4), corresponding to the lens holder's outer diameter, but somewhat larger, and at least two slats (6-10) arranged adjustably between the frame (1) and the main slat (3). The first of these slats, seen from the main slat (3), has an opening vertically longer than the main slat's (3) opening (4) but smaller than the main slat's elevation and with an elevation greater than the main slat's, and the second slat, which is situated between the first slat and the frame (1), has an opening vertically longer than the first slat's opening but smaller than the first slat's elevation and with an elevation greater than the first slat's elevation and greater than the frame's (1) opening. The slats (6-10) have upper and lower edges (16) bent over at essentially right angles towards the slat in such a way that the second slat's edges clamp over and under the first slat's edges, which in turn clamp over the main slat's (3) edges.<IMAGE> |
