Spring-Loaded Shroud Bird Feeder for Squirrel Exclusion
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Solution Overview
Problem
Existing squirrel-proof bird feeders are often expensive and fail to effectively exclude all sizes of marauders, particularly squirrels, which consume a large quantity of feed, necessitating frequent refilling.
Innovation Solution
A squirrel-proof bird feeder design featuring a cylindrical seed tube with a spring assembly that can be factory-adjusted to a precise setting, ensuring a consistent weight threshold for activating a shroud to cover the feed opening, preventing access by marauders while allowing birds to access the feed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing squirrel-proof bird feeder designs are used, then some degree of squirrel prevention is achieved, but the cost is relatively high
Solution Approach 1:
The bird feeder is divided into distinct functional components: a seed container, a shroud that can move independently, a spring mechanism for providing force, and weight members for calibration. This segmentation allows each component to be optimized separately and assembled from inexpensive parts, resolving the contradiction between effectiveness and manufacturing cost.
Solution Approach 2:
The shroud acts as an intermediary element between the seed container and the external environment. It can move to either expose or cover the seed opening, providing squirrel proof protection without requiring expensive complex mechanisms. The shroud translates the spring force and weight calibration into effective squirrel deterrence.
2Manufacturing precision
If a fixed weight threshold is used in the spring assembly, then consistent activation is achieved, but adjustment for different marauder sizes is limited
Solution Approach 1:
The spring assembly is designed with dynamic adjustability through the inclusion of removable weight members that can be added or removed from the shroud. This allows the activation threshold to be dynamically calibrated for different marauder sizes while maintaining manufacturing precision through standardized weight components and a systematic calibration process.
Solution Approach 2:
The system allows changing the physical parameter of weight threshold by adding or removing standardized weight members. This enables the same basic mechanism to adapt to different marauder sizes (from small birds to large squirrels) by simply adjusting the total weight, resolving the contradiction between precision and adaptability.
3Reliability
If the shroud is designed to move downwardly when compressed, then marauder access is denied, but the mechanism complexity increases
Solution Approach 1:
The complex spring mechanism is extracted and pre-calibrated as a separate module during manufacturing. The spring assembly with weights is pre-adjusted to the correct compressive strength setting and locked in place, removing the complexity of adjustment from the user side while maintaining reliable feed access control through the simple action of adding or removing weight members.
4Manufacturing precision
If factory adjustment to precise setting is implemented, then consistent activation weight is achieved, but manufacturing process complexity increases
Solution Approach 1:
The spring assembly is pre-calibrated to the correct compressive strength setting during the manufacturing process and then locked in place. This preliminary action ensures that all feeders leave the factory with identical, precisely calibrated activation thresholds, while the field adjustability through removable weights provides ongoing adaptability without requiring complex manufacturing processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The bird feeder effectively excludes marauders of various sizes without frequent refilling, providing a cost-effective solution by maintaining a consistent compressive strength setting that ensures the shroud moves to deny access to the feed, thus reducing seed consumption.
Implementation Method 1
a spring extending about the rod, the spring having a lower end biased against a lower stopper and an upper end biased against an upper stopper
Implementation Method 2
a spring extending about the rod, the spring having a lower end biased against a lower stopper and an upper end biased against an upper stopper, the arrangement being such that a predetermined weight on the shroud will compress the spring
Data Source
AI summary
A squirrel proof bird feeder comprising a seed container having a seed tray located at the outlet so as to receive seeds from the seed container, a shroud extending about the seed tray, a cover attached to the shroud, an upper ring housing secured to an upper end of the seed container, the upper ring housing having a central portion located within the seed container, a rod located within the central portion, the rod having a first end secured to the central portion and a second end extending through the cover for hanging the bird feeder, a compression spring extending about the rod, the compression spring having a lower end biased against a lower stopper and an upper end biased against an upper stopper such that a predetermined weight on the shroud will compress the spring and cause the shroud to move downwardly.