Trim Strip Securing Construction for Automotive Door Flange
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Solution Overview
Problem
Existing constructions for securing trim strips to automotive doors with window frames are prone to displacement or detachment when external forces are applied, leading to unsightly appearance and potential loss of the trim strip.
Innovation Solution
A construction featuring a door flange with an outer protrusion and upper step, along with a trim strip having a fit portion, engagement portion, and lower abutting portion, which securely engage with the flange to prevent displacement and detachment, while also incorporating sealing protrusions to prevent rust and noise entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the trim strip is merely inserted into the recess of the door flange without additional securing features, then the ease of installation is improved, but the reliability of the trim strip positioning deteriorates as it can move away or come off when external force is applied
Solution Approach 1:
The door flange is segmented into multiple functional features: a recess for basic insertion, an outer protrusion for engagement, and a tip protrusion for additional securing. The trim strip correspondsingly has a recess, fit portion, and engagement portion. This segmentation allows the trim strip to be easily inserted while providing multiple levels of securing to prevent displacement or detachment when force is applied.
Solution Approach 2:
The trim strip's engagement portion is nested within the door flange's outer protrusion, creating a fitted connection. The fit portion of the trim strip is inserted into the recess of the door flange, and the engagement portion engages with the outer protrusion. This nested structure provides secure positioning while maintaining ease of installation through a straightforward insertion motion.
2Device complexity
If the tip of the door flange is merely inserted into the sealing member without securing features, then the device complexity is reduced, but the reliability of the sealing member positioning deteriorates as it can move away or come off when external force is applied
Solution Approach 1:
The tip of the door flange is pre-formed with a protrusion that engages with the sealing member before the sealing member is fully installed. This preliminary engagement feature ensures that the sealing member is securely positioned from the outset, preventing displacement or detachment when external force is applied during window glass closing operations.
3Ease of manufacture
If the trim strip is secured only at the tip of the door flange and not at the base end, then the ease of manufacture is improved, but the reliability of the trim strip positioning deteriorates as it can move away or come off when external force is applied
Solution Approach 1:
The door flange is segmented into multiple functional features: a recess for basic insertion, an outer protrusion for engagement, and a tip protrusion for additional securing. The trim strip correspondsingly has a recess, fit portion, and engagement portion. This segmentation allows the trim strip to be easily inserted while providing multiple levels of securing to prevent displacement or detachment when force is applied.
Data Source
AI summary
A door flange 11d is provided with an outer protrusion 21e and an upper step20e. A trim strip 40 includes: an exterior appearance portion 41; a fit portion 46 in which the outer protrusion 21e is inserted and fits; an engagement plate 43 engaging with the upper step 20e from above; and a lower abutting plate 44 abutting to the lower face of the door flange 11d from below.