| 摘要 |
<p>Constituted by a not too thick body (1), on the front face (2) of which there is provided one or more horizontal rows (3) (3') of equally spaced windows (20a), and in the interior there are located one or more sets of guiding rolls (13) (23) and tightening shafts (15a) (15b) which will support sliding supporting bands (12) on the external surface of which are located the graphs, figures or letters (4) (4') (21a), which will successively appear when hand moving each band through respective window. The rolls or shafts may be multiple with two intermediate tightening smooth rolls or shafts, or single with a single intermediate tightening smooth roll or shaft (16) provided with sockets with disks (14) as many as band are arranged in each set. Each of the windows of the row corresponds to only one of the sliding supporting bands so that from outside will only be visible at each window the graphs, letter or figure which has been located behind said window. The set of guiding shafts and elements and spacers allow to arrange a series of continuous or not bands as many as divisions or windows are provided at the front opening. If the bands are continuous, they have the smooth rear end shaft, two identical intermediate shafts for tightening and a front shaft on which a series of sockets (27) are located having a grooved surface constituting the hauling element independent for each band. On the internal face of the body there are located a set of upright pivots (22) which constitute guides which will prevent side displacement of the bands and at the rear shaft area there is also a set of U-shaped supports (22a) and in the cavities of which said very shaft (23) remains located. On the internal face of both sides of said body two symmetrical or not symmetrical supports (29) remains fixed provided with offsets (32) in which are housed under pressure the ends of the rear shafts (23) and tighteners (24) and (25) while at the front end it possesses identical offsets (33), so that the front shaft (26) remains socketed and locked sufficiently far away to allow positioning and rotating the grooved sockets (27) hauling the band. The window (20) (20') may be at the front part or at the rear part or at both at same time. <IMAGE> <IMAGE></p> |
