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Solution Overview
Problem
Refrigerated enclosure doors often suffer from accidental over-opening, leading to potential damage of the glass panel and safety hazards due to excessive force, and existing hold-open systems may fail under impact or misalignment, requiring complex reattachment processes.
Innovation Solution
A bracket system for refrigerated enclosure doors featuring pivotably coupled spring arms with detents that provide mechanical tactile feedback and adjustable holding forces to prevent over-opening, allowing for easy reattachment and robust operation across varying door sizes and weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hold-open system is installed to prevent over-opening, then door safety and glass protection are improved, but device complexity increases
Solution Approach 1:
The bracket system employs spring arms that are movable between engaged and disengaged states, allowing the system to dynamically adapt to door position and force conditions. The spring arms automatically engage with detents at specific angles and disengage when excessive force is applied, providing intelligent hold-open functionality without complex control systems.
Solution Approach 2:
The bracket system is self-regulating through the spring mechanism and detent geometry. When the door is opened to a safe angle, the spring arms engage with detents to hold the door open. If excessive force is applied or the door is forced beyond the safe angle, the spring arms automatically disengage, allowing the door to close without damaging the glass. No external control or monitoring is needed.
2Object-affected harmful factors
If detents are positioned to prevent over-opening, then glass damage is prevented, but ease of operation deteriorates due to mechanical feedback resistance
Solution Approach 1:
The spring arms are designed with specific mechanical properties including spring rate and arm geometry that create progressive resistance as the door approaches the hold-open angle. The detents are positioned at precise angles to provide tactile feedback before the glass damage threshold is reached, allowing users to feel the increasing resistance and stop before damaging the glass.
Solution Approach 2:
The detent mechanism provides mechanical tactile feedback to the user through the spring arms. As the door approaches the safe open angle, the spring arms engage with detents, creating noticeable mechanical stops and tactile cues. This feedback allows users to sense the door position and adjust their opening force accordingly, preventing glass damage while maintaining ease of operation within safe limits.
3Reliability
If the bracket system is designed for robust operation under impact, then reliability is improved, but ease of repair worsens due to potential failure modes
Solution Approach 1:
The bracket system is divided into separable components including the bracket body, spring arms, and detent elements. This segmentation allows individual components to be replaced or serviced independently. If a spring arm or detent fails under impact, only that specific component needs to be replaced rather than the entire bracket assembly, simplifying repair while maintaining robust overall performance.
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 bracket system enhances user safety by preventing glass damage, extends the door's lifespan, simplifies maintenance, and ensures the hold-open functionality remains effective even under impact or misalignment, reducing the risk of structural failure.
Implementation Method 1
the second pair of spring arms are configured to flex as a force is applied to the door, the force sufficient to overcome the first holding force and permit the second fastener to slide past the first detent
Data Source
AI summary
A display case including a frame with a first fastener, a door with a second fastener, and a bracket coupling the door to the frame is described. The bracket has a first end coupled a second end. The first end is pivotably coupled to the frame by the first fastener. The first end includes a first pair of spring arms having a first slot to couple to the first fastener and to allow the door to pivot between open and closed positions. The second end is slideably coupled to the door by the second fastener. The second end has detents on a second pair of spring arms and a second slot to allow the second fastener of the door to slide as the door is pivoted between open and closed positions. A first detent is positioned further from the first end of the bracket than a second detent.