Cooler Door Latch Control for Power Loss and Temperature Excursions
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Solution Overview
Problem
Refrigerated coolers and freezers face challenges in maintaining secure access and preventing spoilage due to temperature fluctuations and power outages, which existing locking mechanisms fail to address effectively.
Innovation Solution
A motor-controllable latch and strike mechanism integrated with a cooler controller that locks the door based on temperature sensors and power availability, ensuring the door remains closed during temperature excursions or power loss, while allowing controlled access through manual release, timers, and remote communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motor-controllable latch mechanism is used to automatically lock the door during temperature excursions or power outages, then the reliability of preventing spoilage is improved, but the device complexity increases
Solution Approach 1:
The latch mechanism is merged with the door assembly, where the latch body is formed as an integral part of the door structure. The strike is similarly integrated into the cabinet frame. This integration reduces the number of separate components and simplifies the overall system while maintaining the automatic locking function during temperature excursions or power outages.
Solution Approach 2:
The latch mechanism is designed to automatically engage and lock the door when the door closes, without requiring manual intervention. The spring-loaded latch finger automatically interacts with the strike to secure the door. This self-service mechanism reduces complexity by eliminating the need for complex motor controls while still providing reliable automatic locking.
2Ease of operation
If a latch mechanism with manual release is provided to allow access during power outages, then the ease of operation is improved, but the reliability of maintaining secure access may be compromised
Solution Approach 1:
The latch mechanism is pre-configured with a manual release feature that is normally engaged but can be easily activated when needed. The release mechanism is positioned and designed to allow quick manual disengagement of the latch finger from the strike, providing immediate door access during power outages or emergencies without compromising the normal secure locking function.
3Ease of operation
If the latch finger is spring-loaded to automatically engage the strike, then the ease of operation is improved, but the force required for engagement may be insufficient for secure locking
Solution Approach 1:
The spring-loaded latch finger is designed to work in conjunction with the door's closing motion and the strike geometry. The spring provides the initial engagement force, while the door's momentum and the mechanical advantage of the latch-strike interaction provide additional forcing power to ensure secure locking. The geometry of the latch finger and strike creates a mechanical leverage effect that amplifies the spring force.
Solution Approach 2:
The latch finger and strike are designed with curved or rounded surfaces that facilitate smooth engagement. The curved geometry allows the latch finger to naturally guide itself onto the strike during door closing, ensuring proper alignment and maximizing the effective latching force. The rounded surfaces also distribute the contact forces more evenly, preventing stress concentration.
Data Source
AI summary
A cooler and freezer access control system locks a cooler or freezer when occurrence of an event is detected that requires limiting access to the inside of the cooler or freezer. Examples of such events include the loss of power to the cooler or freezer for a predetermined period of time, the opening of the cooler or freezer door for longer than an allowed time, the loss of functionality of a temperature probe and others. In an embodiment, a service mode is supported wherein the door is left unlocked despite the occurrence of such an event, to allow a stocker or other personnel to leave the cooler or freezer door open while stocking the cooler or freezer with product.