Grain Bin Latch Bar Limit Stop for Injury Prevention
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Solution Overview
Problem
Existing latching apparatuses for bulk storage structures, such as grain bins, often cause injuries due to uncontrolled latch bar rotation and are complex to manufacture and operate, failing to provide a safe and efficient means to open and close the cover.
Innovation Solution
A latching apparatus featuring a pair of latch members with a J or L-shaped configuration, where the latch bar is pivotally mounted, includes an outwardly extending portion that prevents further rotation and provides a mechanical advantage for opening the cover, reducing the risk of injury and simplifying the operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the latch bar is allowed to rotate freely to open the cover, then the opening operation is simple, but the user's knuckles can become pinched causing injury
Solution Approach 1:
The patent applies preliminary anti-action by providing a limit stop that prevents the latch bar from rotating too far and pinching the user's knuckles. The limit stop is positioned to make contact with the user's hand before dangerous pinching can occur, thereby preemptively eliminating the harmful effect while allowing sufficient rotation for cover opening.
2Force
If a cam surface is added to provide mechanical advantage for opening the cover, then the opening force is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the limit stop function with the existing latch bar structure by providing a protrusion on the latch bar that acts as the limit stop. This integration eliminates the need for separate complex cam mechanisms while still providing mechanical advantage through the controlled rotation path and leverage provided by the latch bar's geometry.
3Object-affected harmful factors
If multiple movements are required to open the cover, then the risk of injury is reduced, but the operation becomes complex
Solution Approach 1:
The patent extracts the essential safety function (preventing excessive rotation) from complex multi-movement mechanisms and implements it through a simple limit stop protrusion. This allows the latch bar to rotate in a single continuous motion to open the cover, maintaining operational simplicity while eliminating the harmful effect of uncontrolled rotation through the extracted safety feature.
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 solution effectively reduces the risk of injury and simplifies the operation of opening and closing the cover, while being easier to manufacture, thus enhancing safety and usability in bulk storage structures.
Implementation Method 1
the latch bar is pivotally mounted to the cover member and includes an outwardly extending portion that prevents further rotation of the latch bar and provides a mechanical advantage for opening the cover
Data Source
AI summary
A latch apparatus for releasably securing a cover member over an access opening in a bulk storage structure. The latch apparatus is pivotally mounted to a cover member and includes a pair of latch members and a latch bar connected to and extending between the latch members. The latch members have a receptacle that receives a catch member and an extension that extends away from the latch member opposite the receptacle. The extension engages the cover member when the latch member is moved from a locked position to an unlocked position to prevent injury to a user.