| 摘要 |
<p>An improved plunger (10) for clearing clogged bathroom drains and the like. The plunger (10) has apertures (34) through the wall (24) of its resiliently collapsible cup (16) and a diaphragm or other occlusion member (38) on the inside surface of the cup (16) for alternately opening and partially occluding the apertures (34) in response to pressures and liquid flow. The invention allows repetitive application of downward hydraulic pressure on the clog without excessive reverse pressures during the intervening upward strokes, facilitates variation in the degree of hydraulic pressure applied, and provides several related advantages. In one preferred embodiment, the diaphragm (38) is secured to a raised portion (36) of the cup (16) inside surface. In another, the degree of maximum occlusion is adjustable by turning the occlusion member (50). In yet another, the cup (44) and diaphragm (46) are integrally formed.</p> |
