Security Door Brace with Composite Reinforcement
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Solution Overview
Problem
Current security measures, such as locks and alarms, are insufficient in preventing forced entry into homes and businesses, as doors can be kicked in or pried open, and hinges may fail under external impact, leading to inadequate physical protection against intruders.
Innovation Solution
A security door brace system with a mounting plate that is firmly affixed to the floor, featuring elongated pins for secure engagement, a handle for ease of use, and a bumper to absorb kinetic energy, constructed from durable, lightweight, and maintenance-free materials like polypropylene sulfide reinforced with glass fiber, preventing inward opening of doors even under external force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locks and alarms are installed to prevent forced entry, then security against intruders is improved, but these measures are insufficient as doors can still be kicked in or pried open
Solution Approach 1:
The door brace is pre-installed in a retracted position within the door frame, ready to deploy before any forced entry attempt occurs. When activation is needed, it rapidly extends to provide immediate structural reinforcement, preventing the door from being kicked in or pried open.
Solution Approach 2:
The door brace system is divided into multiple segments including a main brace body, extendable reinforcement members, and mounting components distributed along the door frame. This segmentation allows the system to deploy selectively at different points of vulnerability on the door structure.
2Reliability
If a security door brace is added to prevent inward opening, then physical protection against intruders is improved, but the device complexity increases
Solution Approach 1:
The door brace system integrates multiple protective functions into a single unified device that combines structural reinforcement, door blocking, and frame strengthening capabilities. This merging reduces the need for multiple separate security components while maintaining comprehensive protection.
Solution Approach 2:
The door brace utilizes thin, profiled reinforcement members that can be positioned within the door frame structure without significantly increasing overall device complexity. These thin members provide substantial structural support when deployed, balancing protection effectiveness with system simplicity.
3Strength
If durable materials like polypropylene sulfide reinforced with glass fiber are used, then strength and durability are improved, but the weight of the door brace increases
Solution Approach 1:
The door brace is constructed from composite materials such as polypropylene sulfide reinforced with glass fiber, which provide exceptional strength-to-weight ratio. This composite structure delivers the necessary durability and impact resistance while minimizing the overall weight of the security device.
Solution Approach 2:
The material properties of the door brace are optimized by adjusting the composition and structure of composite materials. By changing parameters such as fiber reinforcement density and polymer matrix properties, the system achieves maximum strength with minimum weight for the given application requirements.
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 system effectively prevents unwanted entry by withstanding significant external forces, ensuring personal and property safety while being inexpensive, easy to use, and maintaining the door's finish without requiring maintenance.
Implementation Method 1
a bumper to absorb kinetic energy
Implementation Method 2
constructed from durable, lightweight, and maintenance-free materials like polypropylene sulfide reinforced with glass fiber
Data Source
AI summary
A security door brace is provided for bearing against an inside surface of a barrier door in order to prevent non-permitted, inward opening of the door. The security door brace carries one or more elongated pin means for cooperative engagement with one or more slotted receiving means formed within a cooperating mounting plate that is firmly affixed, preferably via conventional screw fastener means, to a portion of the floor underlying the intended operable position of the security door brace.