| 摘要 |
1,135,028. Endless conveyers. T. FUJITA. 10 Dec., 1956 [10 Dec., 1964], No. 52658/65. Heading B8A. At least two conveyers 2, 10 (Fig. 1), operating at respective different speeds are connected by at least one further conveyer 4, the speed along which progressively changes so that the further conveyer(s) 4 form a smooth transition between the two conveyers for loads which comprise load supporting plates 29 (Figs. 12, 13) each of which is adapted to be driven along by the action of frictional engagement between the plate 29 and moving surfaces of the conveyers. In Fig. 1, a pair of roller conveyers 10 are arranged to run at a speed (30 metres per minute) slow enough for passengers to board a chair 10 carried by (each plate 29) from a platform 26 (Fig. 15). Each conveyer 10 feeds, or is fed by, one of the conveyers 4. An assemblage of conveyers 2, 4, and 10 are arranged to form a closed circuit-Fig. 1 and Fig. 2 (not shown). Each conveyer 4 comprises laterally spaced rubber tyred rollers (7) (Figs. 6-8, not shown), carried by each of a longitudinally spaced series of roller drive shafts (6). The driving connection between the shafts (6) and the rollers (7) is through an over-run ratchet clutch (Fig. 9, not shown). Each shaft (6) is connected to the next downstream shaft (6) by a speed changing chain drive, the final downstream shaft (6) being connected to a drive motor. This results in a progressive increase or decrease in driving speed of the conveyer along its length. Where a conveyer section has a curve of small radius (11, Fig. 1) only the radially-outer roller (7) of each shaft (6) is driven (Fig. 10, not shown). A single endless belt may provide the conveying circuit for two side by side conveyers 2 which are intended to convey in opposite directions. In order to suitably return the belt back and forth it is twisted into a vertical plane in runs (A) (Fig. 4, not shown). Each chair 29 is pivotally mounted at 28 on its respective plate 19. A pair of rollers 31 engage rails 33 the height of which are suitably varied to keep the chair 29 in a correct attitude even on inclines. Rollers 32 mounted on a vertical axis, co-operate with rails 34 to maintain directional stability. A section of the rails 33 may be deflectable (Fig. 16, not shown) so as to enable the rollers 31 to escape therefrom. |
