| 摘要 |
<p>A swimmer-propulsion unit (1) has a two-part hollow-cylindrical casing (2) with a front water-inlet (3) and a rear water-outlet (4) of a central water-flow duct. A pod (7) mounted axially of the inlet (3) houses an electric motor (12) and a container (13) for re-chargeable batteries that power the motor (12) via two switches (14). Powering of the motor (12) for direct drive to a "pusher" propeller (11) at the rear of the pod (7) within the duct, requires operation of both switches (14) by concurrent depression of spring-biased levers (9) mounted at hand-grips (8) on opposite sides of the casing (2). At the front of the pod (7) LEDs (17, 18) indicate respectively energising of the motor (12) and re-charging of the batteries via sockets (19). Radial arms (16) and vanes (20) support the pod (7) centrally within a ring (21) which is retained peripherally within an internal annular groove (22) of the casing (2), and which is assembled from two ring mouldings (23, 24) that are clamped together face-to-face and bring together front and rear parts of the pod-casing (10). Two units (1) may be joined alongside one another with common control for more power.</p> |
