Door Barricade with Low Pivot Axis and Spring Assistance
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Solution Overview
Problem
Existing door barricade devices are difficult for children, people in wheelchairs, or those crouching or lying down to operate, as they require complex manual dexterity and may not be effective in preventing intruders from entering a room in a timely manner.
Innovation Solution
A door barricade system with a pivotable stop-device and barricade arm that can be easily operated by applying minimal force, featuring a pivot axis lower than the door handle, a linkage system with a motor or spring for assistance, and a bracket that overlaps the arm in the barricade position, allowing for quick deployment and easy operation by a wide range of individuals, including those with disabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex manual operation mechanism is used (lifting, rotating, and axially moving the rod), then the barricade can be achieved, but the ease of operation deteriorates for users with limited mobility or dexterity
Solution Approach 1:
The barricade device automatically engages when the door is closed, requiring no manual operation by the user. The system self-activates through the door's closing motion, eliminating the need for users to perform complex manual steps while maintaining reliable barricade functionality
Solution Approach 2:
The patent replaces complex manual mechanical operations with an automated mechanical system that utilizes the door's closing force to activate the barricade mechanism, substituting user effort with automated mechanical engagement
2Reliability
If multiple manual steps are required to operate the barricade, then the barricade can be achieved, but the time required to barricade the door increases
Solution Approach 1:
The barricade mechanism is pre-positioned and ready to engage before the door is closed. The system performs the barricading action automatically as the door closes, eliminating the time delay associated with manual operation steps
Solution Approach 2:
The patent eliminates intermediate manual steps by implementing a direct automatic engagement mechanism that transitions the barricade from ready-to-deploy to engaged state in a single continuous motion driven by door closing, bypassing multiple discrete manual operations
3Strength
If the pivot axis is positioned higher (near door handle level), then the structural strength is improved, but the ease of operation deteriorates for children and persons in wheelchairs
Solution Approach 1:
The patent positions the pivot axis at a lower elevation (near floor level) rather than at door handle height, creating a new vertical dimension for operation that is accessible to children and persons in wheelchairs while maintaining structural integrity through alternative support configurations
4Reliability
If a manual dexterity-intensive mechanism is used, then the barricade can be achieved, but the device complexity for users increases
Solution Approach 1:
The barricade device automatically engages when the door is closed, requiring no manual operation by the user. The system self-activates through the door's closing motion, eliminating the need for users to perform complex manual steps while maintaining reliable barricade functionality
Solution Approach 2:
The patent extracts the operational complexity from the user interaction side by implementing automatic engagement, removing the need for users to manipulate complex mechanisms while preserving the sophisticated mechanical engagement system that ensures reliable barricade effectiveness
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 effective and safe barricading of doors by a variety of users, including children and those with disabilities, with minimal force required, ensuring timely prevention of intruder entry and integration with alarm systems and fire extinguisher management.
Implementation Method 1
a spring that is mechanically linked to the stop-device so as to bias the stop-device to a barricade-position
Implementation Method 2
The cam may have a cam-profiled surface that is engageable by the follower
Data Source
AI summary
Barricade devices and methods of barricading a door are disclosed. Such devices and methods may be used to barricade a door, and thereby prevent an intruder from entering a sheltering space, such as a classroom, storeroom, or hallway. The barricade-device may have a pivotable stop-device that is pivotable from a location adjacent to a door. The pivot-location may be at an elevation that is lower than a door handle on the door. The stop-device may be pivotable from a reserve-position to a stop-position. In the reserve-position, the stop-device does not barricade the door. In the barricade-position, the stop-device barricades the door. Operation of the barricade-device may require the use of one or more major muscle groups of the body, but need not require precise dexterity of the fingers or hands (e.g. such as that required to manipulate small keys, latches, and/or the grasping and turning of assemblies). As such, the barricade-device may be used properly and quickly by a wide range of people having differing physical and mental capabilities.