Adjustable Bird Feeder Spring-Loaded Shroud Mechanism
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Solution Overview
Problem
Existing bird feeders fail to effectively prevent larger, undesirable birds and squirrels from accessing seeds, as current deterrents are often outsmarted by these marauders.
Innovation Solution
An adjustably selective bird feeder with a movable shroud that blocks access when weight is applied, utilizing a spring-loaded mechanism and a shroud design that moves to deny access to the seed container when unwanted intruders attempt to feed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed shroud is used to block access openings, then larger birds and squirrels are prevented from accessing seeds, but desired birds cannot access the feed either
Solution Approach 1:
The shroud is made movable rather than fixed, allowing it to shift position based on the weight of the bird attempting to access the feeder. Desired birds can lift the shroud to access feed, while heavier squirrels and large birds cannot overcome the spring force to move it, dynamically adapting the access control to different users.
Solution Approach 2:
The system changes the physical state of the shroud from a static barrier to a weight-responsive component. The spring mechanism allows the shroud's position parameter to vary based on applied weight, creating different access conditions for different bird types without requiring multiple feeders or complex mechanisms.
2Ease of operation
If a movable shroud is used to allow bird access, then desired birds can feed, but squirrels and large birds can also access the seeds
Solution Approach 1:
The spring mechanism provides an opposing force (counterweight) that balances the weight of birds attempting to access the feeder. The spring force is calibrated to be overcome by small desired birds but remains sufficient to prevent movement when heavier squirrels or large birds attempt to access the feed, using weight differential as the selection criterion.
3Object-affected harmful factors
If covers and baffles are used to deter squirrels, then some protection is provided, but squirrels overcome these devices through ingenuity
Solution Approach 1:
The feeder uses the weight of the intruder itself as the deterrent mechanism. Rather than relying on external barriers that squirrels can bypass, the system automatically responds to each attempt by using the spring-loaded shroud to block access based on the intruder's own weight, creating a self-regulating protection system that adapts to each interaction.
4Object-affected harmful factors
If selective bird feeders are designed for specific bird sizes, then access control is achieved, but adaptability to different bird types is limited
Solution Approach 1:
The spring-weight mechanism provides a universal selection principle that can accommodate multiple bird types by adjusting spring tension rather than requiring different feeder designs for each bird species. The same basic structure can selectively serve different bird types (e.g., cardinals, finches, sparrows) by simply changing the spring calibration, making the feeder adaptable to various applications.
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
Effectively prevents larger birds and squirrels from accessing seeds by using a weight-activated shroud mechanism, ensuring that only desired birds can feed while allowing seed egress and airflow.
Implementation Method 1
utilizing a spring-loaded mechanism and a shroud design that moves to deny access to the seed container when unwanted intruders attempt to feed
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A bird feeder (10) comprising a seed container (32), a seed tray situated below the seed container, a shroud extending about the seed tray and having an opening therein to permit access thereto, a perch (136) proximate the opening, a center tube (44) mounted internally of the feed container and a non rotatable nut mounted within the center tube, a post being screwthreadedly engaged with the non rotatable nut to adjust spring tension, a cover (12) about an upper end of the feed container, the arrangement being such that pressure from an animal such as a squirrel on either the cover or perch will cause the shroud to block the opening and deny access to the seed.