Door Frame Angular Profile Corrosion Protection
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Solution Overview
Problem
The lower edge of door frame angle profiles is susceptible to corrosion due to exposure to standing water and capillary-bound liquid, with existing solutions like plastic caps being brittle and visually unsightly, and complicating the attachment process.
Innovation Solution
Designing the angle profiles and foot brackets to maintain a gap of at least 2 mm to 10 mm between the lower edge and the floor, using a stepped foot angle and collar to ensure ventilation, and optionally incorporating a seal for thermal insulation and light blocking, while using corrosion-resistant materials or coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic caps are attached to the lower edge of frame side parts to prevent corrosion, then corrosion protection is improved, but the caps become brittle and visually unsightly when exposed to weather and sunlight
Solution Approach 1:
The patent removes the plastic caps entirely and instead extracts the corrosion protection function to the angular profile itself through geometric design (gap creation) and material selection (corrosion-resistant materials), eliminating the harmful visual appearance and degradation issues of plastic caps
Solution Approach 2:
The patent changes the geometric parameters of the angular profile by creating specific gaps (5-20mm from floor, 3-10mm from base angle) and modifies material parameters by using corrosion-resistant materials, thereby achieving corrosion protection without plastic caps
2Reliability
If plastic caps are used to protect the lower edge from corrosion, then corrosion protection is improved, but the attachment process becomes more difficult
Solution Approach 1:
The patent removes the plastic caps and their associated attachment complexity, replacing them with a simplified design where the angular profile's geometric features (pre-formed gaps and protrusions) directly provide corrosion protection, thereby simplifying the attachment process
Solution Approach 2:
The angular profile is pre-designed with integrated gap features and protrusions during manufacturing, so that corrosion protection is built-in before installation, eliminating the need for separate cap attachment steps
3Strength
If the lower edge of the angle profile is kept close to the floor for structural stability, then structural integrity is improved, but the lower edge becomes exposed to standing water and capillary-bound liquid causing corrosion
Solution Approach 1:
The patent optimizes the distance parameter (5-20mm from floor) and gap parameter (3-10mm from base angle) to achieve a balance between structural integrity and corrosion protection, creating sufficient ventilation space while maintaining structural stability
Solution Approach 2:
The patent applies different geometric configurations to different parts of the angular profile: the lower edge is positioned at a specific distance from the floor for ventilation, while gaps are created at specific locations relative to the base angle, providing localized corrosion protection where most needed
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
Prevents corrosion by ensuring adequate ventilation and drying of the lower edge, eliminating the need for plastic caps and costly sheathing, while maintaining structural integrity and aesthetic appeal.
Implementation Method 1
the lower edge of the angle profile fastened to the base angle is at a distance of more than 5 mm from the floor... ensures that the edge of the angle profile is always well ventilated and can dry off
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The frame has a metallic angular profile (2) comprising a front surface (3) arranged parallel to a door opening and a bracket (4) at a frame outer side. A lower edge (11) of the angular profile comprises floor-sided distance (a) of more than 5mm, and the angular profile is attached at a foot angle (8). An arm (10) of the angular profile has step shape, and the angular profile is attached at a section (12) of the arm such that a gap with width of 2mm is formed between the lower edge and vertical surfaces of the foot angle, where the section is projected outward.