Attic Inlet Linkage for Consistent Barn Ventilation
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Solution Overview
Problem
Existing attic inlets for livestock barns face challenges in efficient airflow management due to mechanical components like cables and counterweights that can stretch, leading to inconsistent ventilation and require complex adjustments, and existing solutions lack a simple and tool-free mechanism for lid removal and replacement.
Innovation Solution
The design features a tubular air inlet system with parallel axles, yokes, and pivot pins that allow for angular rotation of pull and connecting bars to control the lid's position, utilizing springs and counterweights for automatic closure and machine-controlled opening, and includes a removable lid locking mechanism with wings to prevent dropping, ensuring consistent airflow and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cables and counterweights are used to control the lid, then the lid can be opened and closed, but the cables can stretch leading to inconsistent ventilation and requiring complex adjustments
Solution Approach 1:
The patent replaces the cable and counterweight mechanical system with a direct mechanical linkage system consisting of connecting bars, pivot pins, and axles. This substitution eliminates the stretching problem inherent in cable-based systems while maintaining the ability to control lid position through a purely mechanical means that does not require adjustment over time.
Solution Approach 2:
Instead of using a flexible element (cable) that stretches and requires adjustment, the patent inverts the approach by using a rigid mechanical linkage system. The connecting bars and pivot pins create a fixed-geometry mechanism where the lid position is determined by the physical dimensions of the rigid components rather than by a flexible element that changes length.
2Reliability
If the lid is secured with multiple locking bars and tabs, then the lid remains stable during operation, but the lid becomes difficult to remove and replace
Solution Approach 1:
The patent divides the lid into separable components: the lid body, locking bars, and tabs. The locking bars are designed to detach from the tabs, allowing the lid to be removed in sections. This segmentation enables the lid to be stable during operation (when locked) while still being removable for maintenance when the locking mechanism is disengaged.
Solution Approach 2:
The lid locking system transitions from a static fixed state to a dynamic removable state. The locking bars can be engaged to provide stability during operation, and disengaged to allow easy removal. This dynamic capability allows the same structure to serve both functions: providing stability when needed and enabling easy maintenance when needed.
3Productivity
If the lid is lowered horizontally to provide air exchange, then airflow is enabled, but the lid may become misaligned or unstable during movement
Solution Approach 1:
The patent creates a guided movement path for the lid using the connecting bars and pivot pins that ensure the lid moves along a controlled trajectory. The mechanical linkage system maintains the lid in a consistent position relative to the inlet housing throughout the opening and closing motion, preventing misalignment by constraining the movement to a predetermined path.
Solution Approach 2:
The connecting bars and pivot pins act as intermediary elements between the lid and the fixed inlet housing. These intermediaries guide the lid's movement and maintain proper alignment during the transition from closed to open position, preventing direct contact that could cause misalignment or instability.
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
This solution provides consistent and controlled airflow management with easy lid replacement and maintenance, reducing the need for tools and ensuring reliable operation by maintaining the lid's alignment and stability during movement, while allowing for coordinated control of multiple inlets.
Implementation Method 1
pivot pins that allow for angular rotation of pull and connecting bars to control the lid's position
Implementation Method 2
utilizing springs and counterweights for automatic closure
Implementation Method 3
utilizing springs and counterweights for automatic closure and machine-controlled opening
Data Source
AI summary
An attic inlet has a square tube to communicate between an attic and a room through a substrate, with a lid permitting airflow when open, and not when closed. The lid is moved by upper pull bars and lower connecting bars attached to the lid. Upper pull bars and lower connecting bars are attached by pivot pins to yoke arms pivoting about parallel axles. Springs may urge the lid into closed default position. An axle with an associated stub arm may be rotated by cord to open the lid. Alternatively a counterweighted arm may urge the lid into closed default position, where negative pressure can open the lid. The lid is attached by tabs on the connecting bars passing through the lid, and lid locking bars engaging apertures in the tabs.