Dual-Material Doorstop Structure to Prevent Carpet Jamming
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Solution Overview
Problem
Existing doorstops installed at the lower side edge of doors hinder door movement due to high friction with carpets, leading to jamming, and they are cumbersome for storage and transport.
Innovation Solution
A doorstop design using a suede material for secure attachment via hook-and-loop fasteners at the door edge and a glossy material for reduced friction on carpets, combined with compressible filler rods sealed in a vacuum-packed package for easy storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a suede material is used for attachment to the door, then the attachment strength is improved, but the friction with the carpet increases causing door jamming
Solution Approach 1:
The doorstop is designed with different materials at different locations: the attachment surface uses suede material for high friction and strong bonding with the hook-and-loop fastener, while the carpet-contact surface uses a smooth material with low friction coefficient to reduce resistance during door movement. This local differentiation of material properties resolves the contradiction between secure attachment and smooth operation.
Solution Approach 2:
The doorstop combines multiple materials with complementary properties: suede material for attachment surfaces to maximize bonding strength, and a smooth low-friction material for carpet-contact surfaces to minimize resistance. This composite material approach allows the single doorstop component to simultaneously achieve both strong attachment and smooth door movement.
2Strength
If the doorstop is made rigid for structural stability, then the structural strength is improved, but the storage and transport volume increases
Solution Approach 1:
The doorstop incorporates a flexible or collapsible structure that can transition between an expanded rigid state during use (providing structural strength and gap-blocking functionality) and a compressed compact state for storage and transport. This dynamic transformation allows the doorstop to maintain structural integrity when needed while minimizing storage volume.
Solution Approach 2:
The doorstop design allows components to be nested or collapsed into a compact configuration for storage, similar to a nested doll structure. When deployed, the structure expands to provide the necessary rigidity and functionality, thereby resolving the contradiction between structural strength and storage compactness.
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 doorstop securely attaches to doors without jamming and allows easy door movement, while the vacuum-packed fillers reduce storage volume and enhance portability.
Implementation Method 1
a hook-and-loop fastener is arranged at the lower side edge of the door; where the groove inner surface is made of a first material, and the first material is detachably attached and secured to the hook-and-loop fastener
Implementation Method 2
a doorstop filler material can be pressurized and sealed for easy carrying and storage of the doorstop
Implementation Method 3
the at least one filler rod is compressed into a flattened shape and accommodated inside the packaging bag chamber by means of vacuum sealing
Data Source
AI summary
A doorstop includes, first and second filler rods, and a doorstop accommodating bag. First and second accommodating portions are arranged on two sides of the doorstop accommodating bag for accommodating the filler rods. A gap is provided between the first and second side accommodating portions to form a doorstop groove after the filler rods are loaded into the accommodating portions. The doorstop groove has a groove inner surface. A hook-and-loop fastener is arranged at a lower side edge of a door. The groove inner surface is made of a first material, detachably attached and secured to the hook-and-loop fastener to enable the groove inner surface to be attached and secured to the hook-and-loop fastener. A surface of a part of the doorstop accommodating bag other than the groove inner surface is made of a second material. The first material has a coefficient of friction greater than that of the second material. The doorstop is prevented from detaching in an installation state to cause jamming of the door.