Tongue-and-Groove Plastic Cladding Joint with Integrated End Cap
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Solution Overview
Problem
Existing methods for joining plastic cladding planks end-to-end are cumbersome, time-consuming, and aesthetically undesirable, as they expose the core color of the planks, leading to issues with wind and water penetration.
Innovation Solution
A method for producing elongated elements with a tongue extending outwardly and an undercut, formed by displacing a portion of the primary major surface inwardly using a press tool and machining, allowing for interengageable complementary formations that enable end-to-end joining without exposing the core material and providing a weatherproof joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known methods for joining planks end-to-end are used to protect against wind and water penetration, then weatherproofing is improved, but the joints become obtrusive and aesthetically displeasing
Solution Approach 1:
The patent combines the tongue and groove jointing mechanism with the end cap function into a single integrated structure. The end cap is formed as part of the extrusion process itself, eliminating the need for separate coupling elements while maintaining weatherproofing capabilities.
Solution Approach 2:
The extrusion process creates planks that simultaneously achieve structural formation, surface finishing, and jointing functionality. The single extrusion operation produces both the plank body and the integrated end caps, making the system multi-functional and eliminating additional joining components.
2Device complexity
If cladding planks are joined end-to-end with cut ends concealed, then aesthetic appearance is improved, but wind and water penetration protection becomes difficult to achieve
Solution Approach 1:
The patent merges the aesthetic jointing function with the weatherproofing function by forming integrated end caps as part of the plank structure. The end caps conceal the cut ends while simultaneously providing the necessary barrier against wind and water penetration.
3Productivity
If a press tool is used to displace the primary major surface inwardly to form the tongue, then manufacturing efficiency is improved, but the process complexity increases
Solution Approach 1:
The patent performs the tongue formation action during the initial extrusion process itself, rather than as a subsequent operation. The die geometry is designed to automatically displace and form the tongue structure as the material is extruded, eliminating the need for separate pressing or machining operations.
Solution Approach 2:
The extrusion die is designed to self-form the tongue and end cap structures through its geometry alone. The material flow and pressure during extrusion automatically create the desired complex shapes without requiring additional tools or operations, making the process self-sufficient.
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 method allows for efficient, aesthetically pleasing, and weatherproof joining of plastic cladding planks without the need for additional coupling elements, while concealing the core material, accommodating thermal expansion, and reducing the complexity of the joining process.
Implementation Method 1
urging a die of a press tool into engagement with the first primary major surface of the elongated member, the die extending transversely of the elongated member for displacing a portion of the first primary major surface of the elongated member out of the first primary plane inwardly into the elongated member
Implementation Method 2
forming an undercut in the elongated member from the second primary major surface adjacent the location at which the tongue is to be formed by machining a portion of the elongated member adjacent the location at which the tongue is to be formed
Data Source
Figure 1
Figure 2
Figure 3~7
AI summary
A method for sequentially producing lap planks (1) from a continuous extruded member (35) of plastics material comprises forming a tongue (30) on a first end (2) of the lap plank (1) and a groove (32) on the opposite second end (3) of the lap plank (1), so that a plurality of the lap planks (1) can be joined in end-to-end abutting relationship with the tongue (30) of each lap plank engaged in the groove (35) of an adjacent lap plank (1). The tongue (30) of each lap plank (1) is formed by an indent (34) formed in a front surface (6) of the extruded member (35) to form one surface of the tongue (30), and the other surface of the tongue (30) is formed by machining material from the rear surface (5) of the extruded member (35) adjacent the indent (34). In the sequential production of the lap planks (1), the groove (35) is formed in an end (80) of the elongated member (35) from which the just formed lap plank (1) has been severed, and the tongue of that next to be formed lap plank (1) is then formed.