Flow-Through Centering Sleeve for Stronger Adhesive Bolt Anchoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current centering devices for screws or bolts in holes limit the force transmission to the substrate due to their design, which prevents the resin-based adhesive from fully contacting the anchor, resulting in a weaker connection.
Innovation Solution
The centering device features multiple flow-through openings around its circumference, allowing the adhesive to contact a larger surface area of the screw or bolt, thereby enhancing the connection between the screw or bolt and the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the centering device covers the anchor at the respective section to prevent adhesive contact, then the adhesive does not get in contact with the anchor at that section, but the force transmission from the screw or bolt to the substrate is limited
Solution Approach 1:
The centering device is segmented with multiple flow-through openings distributed around its circumference, dividing the continuous wall into sections that allow adhesive passage. This segmentation enables the adhesive to contact multiple areas of the anchor while the device still provides centering function, thereby improving force transmission without sacrificing connection reliability
Solution Approach 2:
The centering device incorporates flow-through openings that create a porous structure, allowing the adhesive to penetrate through the device wall and reach the anchor surface. This porous design enables simultaneous centering and adhesive bonding functions, resolving the contradiction between preventing adhesive contact and ensuring force transmission
2Manufacturing precision
If the centering device is designed to maintain constant distance between inner and outer surfaces, then proper centering is achieved, but the adhesive contact area with the anchor is reduced
Solution Approach 1:
By segmenting the centering device wall with flow-through openings, the device maintains its constant distance geometry for accurate centering while creating multiple pathways for adhesive to reach the anchor. The segmented structure allows the adhesive to contact the anchor at multiple points around the circumference, compensating for the reduced contact area at any single point
Solution Approach 2:
The flow-through openings add a third dimension to the adhesive flow path, allowing adhesive to pass through the centering device wall from the outer surface to the inner surface. This dimensional change enables the adhesive to reach the anchor while the centering device maintains its precise constant distance geometry
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The invention is directed at a centering device for centering a screw or a bolt in a hole, defining an outer circumferential surface configured to be brought in contact with an inner circumferential surface of the hole, defining an inner circumferential surface configured to be brought in contact with an outer circumferential surface of the screw or the bolt, and a connecting portion connecting the outer surface and the inner surface, wherein the connecting portion is configured to maintain an approximately constant distance between the inner surface and the outer surface along a circumference of the centering device, wherein the centering device forms multiple flow-through openings in the inner circumferential surface and wherein the multiple flow-through openings are distributed around the circumference of the centering device. The invention is also directed at a process for attaching a screw or a bolt to an object, comprising: forming a hole in the object, the hole having a center axis and a diameter greater than a diameter of the screw or bolt, applying filling material into the hole to partly fill the hole with the filling material, attaching a centering device as described above to the screw or bolt so that an inner surface of the centering device abuts an outer circumferential surface of the screw or bolt, and inserting the screw or bolt together with the centering device into the hole in the object so that an outer surface of the at least one centering device abuts an inner circumferential surface of the hole and so that the filling material enters the flow-through openings formed in the at least one centering device.