초록 ▼

A selective nectar dispensing system for use with a bird feeder. The nectar dispensing system includes a pivot assembly which has a counterweight at one end and a feeding port restricting portion at another end. The pivot assembly is operable between a closed blocking position and an open feeding po

A selective nectar dispensing system for use with a bird feeder. The nectar dispensing system includes a pivot assembly which has a counterweight at one end and a feeding port restricting portion at another end. The pivot assembly is operable between a closed blocking position and an open feeding position. The counterweight normally biases the restricting portion to the closed blocking position and has a mass selected to both permit a feeding bird to move the restricting portion towards the open feeding position and to prevent movement of the restricting portion by an insect, thus providing selective access to the feeding port. The feeding port restricting portion is urged away from the feeding port against the force of the counterweight. Access to the feeding port is provided only when the feeding port restricting portion is urged away from the feeding port by the beak of a feeding bird in one embodiment and by the weight of the bird in another embodiment.

대표청구항 ▼

[ I claim:] [1.] A selective nectar dispensing system for use with a bird feeder having a base defining an interior side, a nectar reservoir, and at least one feeding port, the nectar dispensing system comprising:a pivot assembly pivotally mounted to the base having at one end a counterweight and at

[ I claim:] [1.] A selective nectar dispensing system for use with a bird feeder having a base defining an interior side, a nectar reservoir, and at least one feeding port, the nectar dispensing system comprising:a pivot assembly pivotally mounted to the base having at one end a counterweight and at a second end a feeding port restricting portion operable between a closed blocking position and an open feeding position, the counterweight normally biasing the restricting portion to the closed blocking position and having a mass selected to both permit a feeding bird to move the restricting portion towards the open feeding position and to prevent movement of the restricting portion by an insect, wherein the pivot assembly includes a joint having a pair of arms extending therefrom, each arm being integral with the joint and defining a fixed angle therebetween, with one arm terminating at the counterweight and the other arm terminating at the feeding port restricting portion.