| 摘要 |
<p>A pressure type pool cleaner includes a head (10) propelled forwardly (34) over a surface (12). Water pumped (14, 16) to the head drives wheels (22) turbine fashion; inducts debris into a cleaner system; and is ejected via a thrust nozzle (42) onto a guide (68) and thence along a thrust line (80) to thrust the head along the line (80). A pivoted director (44) mounts the guide (68) and includes a surface member (56) exposed to the water. During forward movement, water pressure on the member (56) counteracts jet stream pressure on the guide and maintains the guide's orientation for the thrust line (80) to pass closely above a wheel rotation axis (24). When an obstacle stops forward motion, pressure on the member (56) and its counteracting stop, the guide (68) is reoriented and redirects the thrust to well below the axis (24) to pivot the head (10) about the axis to assist the wheels (22) to scale the obstacle.</p> |
