Top-fill hummingbird feeder with float valve base closure mechanism

1. A top-fill hummingbird feeder comprising:

a liquid container with a liquid flow opening at a lower end and a removable cap at an upper end;

a feeding basin positioned below the liquid container, said feeding basin having a cover with at least one feeding port therein sized for a hummingbird's beak; and

a sealing mechanism associated with he liquid flow opening of the liquid container and the feeding basin, said sealing mechanism including a float valve which, when the float valve is in a first position, said liquid flow opening is open allowing fluid to flow from said container into said basin and, when the float valve is in a second position, said liquid flow opening is closed to prevent fluid flow from said container into said basin;

said float valve including a float and a sealing member with substantially vertical movement of said float causing substantially vertical, movement of said sealing member, an outer edge of said float including at least one cutout or recess that aligns with the at least one feeding port in the basin cover so that the float does not obstruct a hummingbird from accessing nectar in the basin by inserting its beak through the feeding port.

2. The top-fill hummingbird feeder as set forth in claim 1 , wherein said basin cover includes a plurality of feeding ports and the outer edge of said float includes a plurality of cutouts spaced around a float perimeter to align with the plurality of feeding ports, respectively.

3. The top-fill hummingbird feeder as set forth in claim 2 , wherein said float and said sealing member are coupled to one another and move upwardly and downwardly together in response to changing fluid level in said feeding basin.

4. The top-fill hummingbird feeder as set forth in claim 1 , wherein said cap has a vent hole to subject liquid in said liquid container to atmospheric pressure during use of said feeder.

5. The top-fill hummingbird feeder as set forth in claim 2 , further comprising an upwardly extending generally cylindrical collar positioned in said feeding basin that receives the lower end of said liquid container, said float having a generally cylindrical central opening through which said collar extends, a diameter of the central opening being larger than an outer diameter of the collar, leaving a space between an inner wall of the central opening and an outer surface of the collar, said space enabling the float to move horizontally, said float also being movable up and down with respect to said collar in response to changes in nectar level in the basin.

6. The top-fill hummingbird feeder as set forth in claim 5 , wherein said float central opening is spanned across its diameter by a bridge, a wall of said collar being split on opposing sides to form a channel that receives said float bridge, a width of said bridge being less than a width of said channel to leave a gap, said gap providing the float with a degree of rotatability with respect to said collar.

7. The top-fill hummingbird feeder as set forth in claim 6 , wherein said sealing member is positioned on an upper surface of a central part of said bridge and, through upward and downward movement with said float, cooperates with a mating component positioned in said liquid container lower end to close and open the liquid flow channel, respectively.

8. The top-fill hummingbird feeder as set forth in claim 1 , further comprising an upwardly extending generally cylindrical collar positioned in said feeding basin, said float having a generally cylindrical central opening through which the collar extends, a diameter of the central opening being larger than an outer diameter of the collar, leaving a space between an inner wall of the central opening and an outer surface of the collar, said space allowing the float to move horizontally with respect to the collar.

9. The top-fill hummingbird feeder as set forth in claim 1 , wherein said sealing mechanism further includes a sealing plate positioned generally horizontally in said container lower end and having a hole therein to provide a liquid flow opening through said sealing plate.

10. The top-fill hummingbird feeder as set forth in claim 9 , wherein said sealing member is positioned below said sealing plate and is vertically movable between an upper position and a lower position relative to said sealing plate.

11. The top-fill hummingbird feeder as set forth in claim 1 , wherein said liquid container includes a bottleneck extension at said lower end and said sealing mechanism includes a bottleneck seal member having an opening therethrough smaller than said liquid flow opening to create a liquid flow channel smaller than said liquid flow opening, said sealing member of said float valve configured for sealing engagement with said bottle seal member to close said liquid flow channel.