Hands-Free Stall Door Automation with Proximity Sensors
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Solution Overview
Problem
Existing technologies have not successfully enabled hands-free operation, locking, and indication of occupancy for bathroom stall doors, which are lighter and require different space and functionality compared to traditional doors, and lack effective automation for opening, closing, and locking mechanisms.
Innovation Solution
A hands-free apparatus using two proximity sensor arrays with LED displays and actuators on either side of the stall door, allowing patrons to open, close, lock, and unlock the door by hand motion, with sensors detecting occupancy and controlling the door mechanisms, and a controller managing sequences for operation and display updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional manual locking mechanism is used, then the door can be locked securely, but the patron must contact the lever and bolt the door manually
Solution Approach 1:
The patent replaces the manual mechanical locking system with an automated electromechanical system. A proximity sensor detects hand motion and triggers an actuator that automatically engages the locking mechanism, eliminating the need for manual contact with the lever or bolt while maintaining secure locking functionality.
Solution Approach 2:
The door locking system performs the locking action autonomously by detecting the patron's presence and motion through the proximity sensor. The system self-activates the actuator to engage the lock without requiring the patron to manually operate any controls, achieving hands-free operation.
2Ease of operation
If automated door opening apparatus is installed, then hands-free opening is enabled, but the apparatus requires significant physical space and is not adapted for lighter stall doors
Solution Approach 1:
The patent extracts only the essential sensing and actuation components needed for hands-free operation, eliminating the bulky mechanical structures of traditional automated door openers. The proximity sensor and small actuator are mounted directly on the stall door frame, requiring minimal space while achieving the desired functionality.
Solution Approach 2:
The patent uses a proximity sensor as an intermediary device that detects hand motion without physical contact and translates it into automated door operation. This intermediary approach enables hands-free control with minimal hardware, avoiding the need for large mechanical actuators or complex linkages.
3Loss of information
If occupancy detection is implemented, then waiting patrons are informed of stall status, but additional sensors and control mechanisms are required
Solution Approach 1:
The proximity sensor serves multiple functions: it detects hand motion for triggering door operation, determines patron presence for occupancy status, and controls the locking mechanism. This multi-functional approach eliminates the need for separate sensors and control systems, achieving occupancy information and automated control with a single device.
Solution Approach 2:
The patent combines the occupancy detection function with the door operation control function into a single integrated system. The same proximity sensor that triggers the door opener also provides occupancy status information, and the same actuator controls both door opening and locking, reducing overall system complexity.
4Extent of automation
If existing stall door automation attempts are made, then some functions are automated, but locking and hands-free operation are not successfully achieved
Solution Approach 1:
The patent replaces manual mechanical locking with an automated electromechanical locking system controlled by a proximity sensor. The actuator automatically engages the locking mechanism based on detected hand motion, providing reliable automated locking without requiring manual intervention while maintaining the mechanical reliability of the locking function.
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
Enables hands-free operation of bathroom stall doors with low power consumption, easy installation, and accessibility for disabled patrons, while informing waiting individuals of occupancy status through LED indicators.
Implementation Method 1
a first proximity sensor array comprising three linearly disposed sensors... a second proximity sensor array comprising three linearly disposed sensors
Implementation Method 2
each sensor further including a light-emitting-diode display device consisting of at least two colors, for example red and green
Data Source
AI summary
A first proximity sensor array arranged on a first side of a stall-door comprises three linearly aligned sensors whereby left-to-right movement of a patron's hand within the sensing zone causes a bathroom stall door to open. A second proximity sensor array arranged on a second side of the stall door comprises three linearly aligned sensors whereby right-to-left movement of a patron's hand within the sensing zone causes the door to close. A second right-to-left movement across the same second sensor array causes the stall door to lock and a first display array arranged on the first side of the door and a second display array arranged on the second side of the door alight, indicating the stall is occupied and locked. A left-to-right movement across the second sensor array causes the stall door to unlock and open, and the display arrays indicate the stall is available.