| 摘要 |
<p>A no spill training cup (10) includes a cup (12) and cover (14) with a drinking spout (18) in the cover (14). The cover (14) also has a vent opening (19) for maintaining the ambient pressure in the cup (10) with the vent opening (19) being covered by a hydrophobic membrane (38) that allows the flow of air into the cup (10) but prevents liquid from flowing out of the cup (10) through the vent opening (19). A valve housing (40a) is attached to the cover (14) on the inlet side of the spout (18). The valve includes a diaphragm (66a) supported in the housing (40) and biased to engage a valve seat (64a) in the housing (40a) to prevent flow of liquid from the cup (10) to the spout (18). When a child sucks on the spout (18), the pressure on the outlet side of the diaphragm (66a) causes it to disengage the valve seat (64a) and allow the liquid to flow out of the cup (10) through the spout (18). When the child stops sucking on the spout (18), the valve immediately returns to its closed position on the seat (64a) so as to prohibit the flow of liquid from the cup (10) through the spout (18).</p> |
