Grooved Wood Threaded Member for Glue-Assisted Timber Fastening
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Solution Overview
Problem
Existing methods for fastening metal construction components to wood components often result in damage to the wood and inadequate anchoring, particularly when using threaded members.
Innovation Solution
An elongated threaded member with longitudinal grooves along its external wood thread, designed to distribute glue evenly and minimize damage to the wood surface during installation, is used to reinforce wood structures by being screwed into blind holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a threaded member is screwed into wood to fasten metal construction components, then the fastening strength is improved, but damage to the wood surface and inadequate anchoring occur
Solution Approach 1:
The threaded member is segmented with longitudinal grooves that divide the glue application area into multiple sections, allowing even glue distribution around the threaded portion without concentrating stress or damage at single points in the wood
Solution Approach 2:
Glue is applied to the threaded member before insertion into the wood hole, ensuring that the glue is already positioned to provide optimal anchoring and minimize wood damage during the fastening process
2Stability of the object's composition
If a threaded member is used to reinforce wood structures, then structural integrity is improved, but glue distribution becomes uneven leading to inadequate anchoring
Solution Approach 1:
The longitudinal grooves segment the glue application surface, creating multiple channels that guide and distribute glue evenly around the threaded portion, ensuring uniform anchoring along the entire embedded length
Solution Approach 2:
The grooves create different local zones on the threaded member surface - some areas with glue exposure for anchoring, and some areas with thread exposure for mechanical engagement, optimizing both chemical and mechanical bonding locally
3Ease of operation
If existing fastening methods are used, then installation is simple, but excess glue cannot escape causing contamination and messy installation
Solution Approach 1:
The longitudinal grooves create dedicated pathways that extract and channel excess glue away from the critical fastening zone, allowing it to escape in a controlled manner through the grooves rather than contaminating the surrounding area
Solution Approach 2:
The grooves act as intermediary channels between the glue application point and the external environment, mediating the flow of excess glue to prevent uncontrolled spillage while maintaining clean installation
Data Source
Figure 1~3
Figure 4~6
Figure 7~9
AI summary
Presented is an elongated threaded member (1) having a central axis A-A, a shank (2), a first free end (3), a second free end (4), and an external wood thread (5) protruding from the shank (2) and extending from the second free end (4) of the elongated threaded member (1) helically along at least a part of the shank (2). The elongated threaded member (1) having at least one longitudinal groove (6) extending in a longitudinal direction of the elongated threaded member (1), wherein said at least one longitudinal groove (6) having a depth that radially extends fully through the external wood thread (5) and into the shank (2) and having a length extending for more than 50 % of the length of the external wood thread (5). Presented is also a method and a fastening arrangement utilizing the elongated threaded member (1).