Wall Bead With Hooking Teeth For Plasterboard Fixation
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Solution Overview
Problem
Existing corner beads face difficulties in secure attachment and repositioning due to hard or soft underlying wall materials, and adhesive methods require setting time and risk damage upon removal.
Innovation Solution
A wall bead design featuring flanges with longitudinally extending teeth or blades that 'hook' onto plasterboards, allowing easy attachment and repositioning without damaging the underlying material, and additional apertures for further fixation with screws or nails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nails or screws are used to attach corner beads, then secure fixation is achieved, but the process becomes difficult and time-consuming when wall material is too hard or soft
Solution Approach 1:
The patent replaces the traditional mechanical fastening system (nails or screws requiring penetration and manipulation) with a mechanical interlocking system using barbs that engage with pre-formed recesses in the wall material. This substitution eliminates the difficulty of driving fasteners into hard or soft materials while maintaining secure fixation through the interlocking geometry of barbs and recesses.
Solution Approach 2:
The corner bead design incorporates self-fixing barbs that automatically engage with the wall material's recesses upon application. The barbs are configured to passively lock into place without requiring additional tools or manual fastening actions, allowing the bead to secure itself to the wall surface through its own structural features.
2Ease of operation
If adhesive is used to attach corner beads, then attachment becomes easier, but the bead must be held in place during setting and cannot be repositioned
Solution Approach 1:
The patent creates a dynamic attachment system where the barbs can be inserted into and removed from the wall recesses. During installation, the barbs engage with the recesses to hold the bead in position, but if repositioning is needed before final plastering, the bead can be removed and reattached without permanent bonding, providing flexibility similar to adhesive but with repositioning capability.
Solution Approach 2:
The wall material is pre-formed with recesses that anticipate the barb structure of the corner bead. This preliminary preparation allows the bead to be quickly attached by simply pressing the barbs into the pre-configured recesses, eliminating the need for adhesive setting time while maintaining easy installation.
3Reliability
If barbs extend perpendicular to the bead for securing, then fixation is achieved, but removal or repositioning damages the underlying plasterboard
Solution Approach 1:
The patent concentrates the fixing function at specific localized points where barbs engage with pre-formed recesses in the plasterboard. Rather than having barbs extend perpendicular to the bead surface, the barbs are oriented to engage with recesses that are locally prepared in the wall material, distributing the mechanical stress and allowing removal without damaging the overall plasterboard structure.
Solution Approach 2:
The pre-formed recesses in the plasterboard act as an intermediary between the corner bead barbs and the plasterboard substrate. These recesses provide a dedicated engagement zone that protects the surrounding plasterboard material from damage during attachment or removal, as the barbs interact only with the recess structure rather than directly with the solid plasterboard.
Data Source
Figure 1(a)~1(c)
Figure 2(a)~2(c)
Figure 3(a)~3(c)
AI summary
A wall bead (10) comprising a central longitudinally extending portion (13), a first elongate flange (11), and second elongate flange (12) which extend longitudinally of the bead, and which separately comprise a front and rear surface. The wall bead (10) further comprises a plurality of teeth (16) disposed upon the first and second flange at longitudinal positions thereon,wherein the teeth are directed away from the respective flange, substantially forwardly of the respective flange, along a common direction that is along the wall bead.