Glazing Bead with Concealed Fastening for Wooden Frames
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Solution Overview
Problem
Existing glazing bead attachment methods often result in visible screw heads, inadequate mechanical stability, and uncontrolled sealing gaps, leading to leaks and aesthetic issues, particularly with wooden frames.
Innovation Solution
A glazing bead design featuring a base with a V-shaped groove and obliquely oriented through holes, allowing screws to be concealed and providing a tilting effect for secure contact pressure, combined with additional retaining bars for enhanced stability and sealing, and a frame construction that covers the glazing bead for a clean appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws are used to fasten the glazing bead to the frame, then mechanical stability is improved, but the screw heads remain visible causing aesthetic issues
Solution Approach 1:
The screw heads are extracted from the visible exterior surface and relocated to the interior side of the frame. The glazing bead is designed with a recessed mounting area where screws are fastened from the inside, removing the aesthetic defect while preserving the mechanical fastening function.
Solution Approach 2:
A cover profile is introduced as an intermediary element that covers the screw heads and mounting area. This cover profile is clipped onto the glazing bead, creating a clean exterior appearance while allowing the screws to remain on the interior side for mechanical fastening.
2Ease of operation
If only point fastening with plastic clips is used, then ease of installation is improved, but mechanical stability becomes insufficient
Solution Approach 1:
The fastening system merges two approaches: plastic clips provide easy installation and positioning, while screws provide strong mechanical fastening. Both methods are combined in the same glazing bead design, with clips engaging from the interior and screws fastening from the interior mounting area, achieving both ease of installation and mechanical stability.
3Reliability
If expansion function of stuffing seal is used to generate contact pressure, then sealing capability is improved, but reliability decreases due to leaks
Solution Approach 1:
The glazing bead is pre-compressed during installation by the mechanical fastening system (screws and clips) before the seal is fully expanded. This preliminary compression ensures immediate contact pressure for sealing, while the seal's expansion provides additional sealing force, creating a redundant and reliable sealing system.
Solution Approach 2:
The contact pressure is generated through mechanical compression rather than relying solely on the seal's expansion. The glazing bead design includes compression elements that apply continuous mechanical pressure to the seal, maintaining optimal sealing pressure regardless of the seal's expansion state.
4Device complexity
If a single fastening web is used, then device complexity is reduced, but sealing performance deteriorates due to gaps
Solution Approach 1:
The fastening system is segmented into multiple independent fastening points (multiple clips and multiple screw locations) distributed along the glazing bead. This segmentation ensures uniform compression and sealing along the entire length of the glazing bead, preventing gaps while maintaining relatively simple individual fastening elements.
Data Source
Figure 1
Figure 2
Figure 3(A)
AI summary
The glass retaining strip (6) has a base (7), which serve as a mounting surface on the floor frame (1). The retaining strip has a glass bridge (9), for the fixation of the glazing element (2). A retaining part is arranged inside glass panel (8) and which has two stops. The glass bridge (9) is provided as a bridge for holding the inside glass panel (8). An independent claim is included for a frame design, and method to assemble a glass retaining strip.