Lock Box Tool Detection Using Load Cell and Shape Sensors
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Solution Overview
Problem
Conventional lock boxes lack a mechanism to confirm whether a property access tool, such as a key or access card, has been returned to the storage area after a showing, leading to potential unauthorized access or loss of the tool.
Innovation Solution
Incorporating a load cell sensor or an object shape detection sensor within the lock box to detect the physical properties (weight or shape) of the property access tool before and after a showing, and activating an alert if the tool is not present or if an incorrect tool is placed in the storage area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lock boxes are used without detection mechanisms, then the device complexity is low and ease of operation is maintained, but the reliability of tool return confirmation is insufficient
Solution Approach 1:
The patent replaces manual verification of tool return with automated sensor-based detection. Load cell sensors detect the weight of the property access tool when placed in the storage area, and object shape detection sensors verify the tool's physical characteristics. This substitution of mechanical/manual verification with electronic sensing mechanisms resolves the contradiction by achieving reliable automated confirmation without requiring complex mechanical interlocking systems.
Solution Approach 2:
The lock box system performs self-verification of tool return through integrated sensors and controllers. The load cell and object shape detection sensors automatically detect and verify the presence of the correct tool, with the controller comparing detected properties against stored reference data. This self-service capability eliminates the need for external verification processes while maintaining high reliability.
2Reliability
If sensor-based detection is added to confirm tool presence, then the reliability of property access tool return is improved, but the device complexity increases
Solution Approach 1:
The lock box integrates multiple functions into a single system: the load cell sensor serves both as a weight detection device and as a trigger for the object shape detection sensor activation. The controller consolidates multiple verification functions (weight comparison, shape pattern matching, and tool identity confirmation) into a single processing unit. This multi-functionality approach reduces overall system complexity while maintaining comprehensive detection capabilities.
Solution Approach 2:
The system performs preliminary detection of the property access tool's weight and physical shape before final verification. The load cell sensor detects weight first, and only if the weight matches the expected value does the object shape detection sensor activate to verify the tool's physical characteristics. This staged verification approach reduces complexity by avoiding unnecessary sensor activations and comparisons.
3Productivity
If manual verification of tool return is used, then the device complexity remains low, but the loss of time for verification increases
Solution Approach 1:
The lock box system provides immediate feedback to users about tool return status. The controller compares the detected weight and shape properties against stored reference data and provides real-time confirmation or alert messages. This feedback mechanism eliminates the need for manual verification time while maintaining low complexity by using simple comparison logic and user interface notifications.
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
Ensures that the correct property access tool is returned to the lock box after a showing, preventing unauthorized access and ensuring the security and accountability of the tool.
Implementation Method 1
detecting, using at least one of: a load cell sensor or an object shape detection sensor, a physical property of a property access tool within the storage area
Implementation Method 2
detecting, using at least one of: a load cell sensor or an object shape detection sensor, a physical property of a property access tool within the storage area
Data Source
AI summary
A method of monitoring a storage area within a lock box including: detecting, using at least one of: a load cell sensor or an object shape detection sensor, a physical property of a property access tool within the storage area prior to a showing of a property, the physical property of the property access tool including at least one of a weight of the property access tool or a shape of the property access tool; saving the physical property of the property access tool; detecting an end of the showing of the property; detecting, after the end of the showing, that the property access tool is not present in the storage area; and activating, using a controller, an alert in response to detecting that the property access tool is not present in the storage area.