Rubber Doorstop Bulb Head Notched Tail Design
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Solution Overview
Problem
Existing door stops often require permanent or semi-permanent attachment, which can cause damage and do not effectively prevent rapid door closure, posing a safety risk, especially for infants and small children.
Innovation Solution
A portable door stop made from a single piece of non-toxic rubber that fits between the door jamb and spine, using a bulb-shaped head to prevent full closure and a notched tail for secure placement and easy storage, without causing damage to surrounding surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If permanent or semi-permanent attachment methods are used, then door stop reliability is improved, but damage to door and surrounding surfaces occurs
Solution Approach 1:
The door stop uses a flexible rubber bulb that can be inserted through the gap between door jamb and door spine without permanent attachment. The rubber material provides flexibility to conform to the door structure while preventing damage through its compliant nature, resolving the contradiction between reliable door stopping and avoiding surface damage.
Solution Approach 2:
The door stop acts as an intermediary element inserted between the door assembly and the closing force. It provides a non-damaging medium that absorbs and redirects the door closure force, preventing direct contact between the door and potentially damaging surfaces while maintaining effective door position control.
2Ease of operation
If traditional latches are used to prevent door closure, then door position control is improved, but complexity of installation and tooling increases
Solution Approach 1:
The invention extracts the essential door position control function from complex latch mechanisms and implements it through a simple rubber bulb inserted through an existing gap in the door structure. This eliminates the need for additional hardware, tooling, and complex installation procedures while maintaining effective door position control.
Solution Approach 2:
The door stop is designed to be self-installing by utilizing the pre-existing gap between door jamb and door spine. The flexible rubber bulb naturally conforms to the door structure upon insertion, requiring no tools, adjustment, or complex assembly procedures, thereby achieving ease of operation with minimal device complexity.
3Speed
If rapid door closure is allowed, then door operation speed is improved, but safety risk to children increases
Solution Approach 1:
The door stop provides preliminary anti-action by being pre-positioned in the door structure to automatically engage and prevent rapid closure before it can occur. The rubber bulb is strategically located to intercept the door's closing motion, providing a safety mechanism that acts in advance to prevent harmful rapid closure while allowing normal door operation.
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 solution provides a safe, damage-free, and portable means to prevent door closure, ensuring safety for children and withstanding external forces like wind, while allowing for easy storage and installation without altering door hardware.
Implementation Method 1
The rubber 'bulb' acts as a 'brake' to stop the door from full closure
Implementation Method 2
Made of one solid piece of non-toxic rubber, the door stop is placed through the space between the door jamb and door spine
Data Source
AI summary
A doorstop includes a bulb-shaped head portion, a tail portion, and a notch formed in a distal end of the tail portion. The doorstop is a one-piece apparatus molded from non-toxic rubber and adapted to be positioned in a gap above a hinge between a doorframe and a door to prevent the door from full closure. For storage of the doorstop, the tail portion can wrap around a door knob and insert into the notch to retain the doorstop in place.