Door Safety Bumper With Hinged Blocking Member
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Solution Overview
Problem
Conventional door safety devices are ineffective in preventing finger injuries from being caught between closing doors, particularly on the latch side and for sliding doors without knobs, as they fail to adequately absorb the crushing force of the door.
Innovation Solution
A door safety device with a blocking member that is movable about a hinge axis, configured to prevent complete closure of the door by angling with respect to the door jamb, utilizing resilient materials like elastomers or foam, and attachment mechanisms such as clips, adhesive, or hook-and-loop fasteners to secure to the door, allowing for absorption and dissipation of impact forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional guards are used to prevent fingers from entering the gap between the door and jamb, then finger protection is improved, but the device fails to prevent crushing of fingers on the latch side and does not work for sliding doors
Solution Approach 1:
The door safety device is designed with a universal mounting system that can be attached to various door types including hinged doors and sliding doors. The blocking member can be positioned at different locations (top, bottom, or side of the door) and angled to create effective barriers for different door configurations, making the device adaptable to multiple door types while maintaining finger protection functionality
2Reliability
If the blocking member is made rigid to effectively prevent door closure, then blocking effectiveness is improved, but detachment forces during impact increase and may cause the device to detach from the door
Solution Approach 1:
The blocking member is designed to be movable relative to the mounting member, allowing it to dynamically adjust its position and orientation during door closure and impact. This mobility enables the blocking member to absorb impact forces through movement rather than rigid resistance, reducing detachment forces while maintaining effective door closure prevention
Solution Approach 2:
The device utilizes resilient materials for the blocking member that can deform under impact, changing physical parameters such as shape and position temporarily to absorb impact energy. This parameter change allows the blocking member to maintain blocking effectiveness while reducing the transmission of detachment forces to the mounting mechanism
3Reliability
If the blocking member is fixed in position to maintain consistent protection, then protection reliability is improved, but the device prevents complete door closure even when not needed
Solution Approach 1:
The blocking member is designed to be movable between a blocking configuration that prevents door closure and a retracted configuration that allows complete closure. This dynamic positioning enables the device to provide protection when needed while allowing normal door operation when the blocking function is not required
Solution Approach 2:
The device allows the blocking member to be positioned in advance in either a blocking or non-blocking configuration based on anticipated needs. Users can pre-position the blocking member to prevent door closure if finger injury risk is anticipated, or allow complete closure when no risk exists, providing proactive control over door safety
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 device effectively prevents finger injuries by maintaining a gap between the door and jamb, reducing the risk of crushing injuries and allowing complete closure when not in use, while minimizing detachment forces during impact.
Implementation Method 1
the blocking member comprises a resilient member
Implementation Method 2
configured to receive the impact of a door frame or door jamb during an attempted closure of the door and to prevent complete closure of the door
Implementation Method 3
a remedial member configured to enable the blocking member to move about an axis extending in a direction parallel to a surface of the door and parallel to an edge of the door
Implementation Method 4
the blocking member is movable about the first hinge axis relative to the surface of the door
Data Source
AI summary
A door safety device generally includes a mounting member for coupling the device to a door and a blocking member for preventing complete closure of the door when the mounting member is attached to the door and the device is in a blocking configuration. The device can also include an intermediate member coupled between the mounting member and the blocking member. The intermediate member defines a first hinge axis extending in a direction parallel to the surface of the door and parallel to an edge of the door. The blocking member is movable (e.g., rotatable or revolvable) about the first hinge axis, at least when the mounting member is coupled to the door and the device is in a blocking configuration, so as to inhibit the transfer of detachment forces from the blocking member to the mounting member upon impact.