Countersunk Anchor Head with Projections for Flush Borehole Anchoring
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Solution Overview
Problem
Anchoring elements for hard materials like concrete require high screwing torques, leading to unevenness and potential damage or injury due to protruding countersunk heads, which is undesirable for flush anchoring and safe operation.
Innovation Solution
The anchoring element features a conical outer surface with projections that scrape the borehole edge, allowing the countersunk head to be fully sunk into the material, ensuring flush installation without excessive pressure on the borehole edge, and includes a torque transmission means integrated within the countersunk head for efficient screwing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high screwing torque is applied to anchor the element in hard material, then anchoring strength is improved, but the countersunk head protrudes from the surface creating unevenness and potential injury risk
Solution Approach 1:
The head is segmented into a countersunk portion (recessed into material) and a projection portion (remaining above surface). The projection serves as a bearing surface for torque transmission while the countersunk portion avoids surface protrusion, resolving the contradiction between needing high torque transmission and avoiding injury risk.
Solution Approach 2:
The solution moves from a traditional flat head geometry to a multi-level head structure with vertical dimensionality. The countersunk head recesses into the material surface while the projection extends above it, creating a stepped configuration that simultaneously achieves flush anchoring and adequate torque transmission surface.
2Power
If the countersunk head is made larger to transmit high torque, then torque transmission capability is improved, but the head protrudes more from the material surface
Solution Approach 1:
The head is divided into functional segments: the projection portion provides the bearing surface for torque transmission, while the countersunk portion is recessed into the material. This segmentation allows the torque-transmitting portion to be sufficiently large without causing overall head protrusion.
Solution Approach 2:
The projection acts as an intermediary element that transfers torque from the fastening tool to the anchoring element body. It serves as the interface for torque application while the countersunk head handles the anchoring function, separating these two functions spatially.
3Productivity
If excessive pressure is applied to screw in the anchoring element, then screwing speed is improved, but material spalling and borehole enlargement occur
Solution Approach 1:
The conical outer surface of the countersunk head performs preliminary action by scraping and clearing the borehole edge during insertion. This prepares the borehole geometry in advance, allowing subsequent screwing to proceed with controlled pressure and reduced risk of spalling.
Solution Approach 2:
The conical geometry of the outer surface changes the pressure distribution during insertion. The tapering shape gradually engages the material, distributing insertion forces over a longer distance and reducing peak pressures that would cause spalling, while still enabling effective screwing.
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 solution enables the anchoring element to be completely sunk into the material, avoiding surface protrusion and material spalling, while maintaining robustness and efficient torque transmission, ensuring reliable and safe anchoring without surface unevenness.
Implementation Method 1
the projection rubs against the circular borehole edge on the front side... The protruding projection scrapes off the material at the edge of the drill hole when screwing in the anchoring element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An anchoring element for anchoring in a borehole in a material comprises a cylindrical core (2) with an inlet end (3), with an outer end (4) opposite the inlet end, with a screw-in direction (5) oriented from the outer end (4) to the inlet end (3), and with a central longitudinal axis (6) oriented parallel to the screw-in direction (5); a cutting thread (7) formed integrally with the core (2) and extending from the inlet end (3) along a cutting thread section (AG) for screwing the core into the borehole; a fastening thread (19) arranged in the core (2) and open outwards opposite the screw-in direction (5) for fastening a fastener; a torque transmission means (21) arranged on the core (2) for transmitting a screw-in torque from a tool to the core (2); and a countersunk head (11) arranged at the outer end (4) whose outer surface (12) tapers conically along the screw-in direction (5). rejuvenated,and at least one projection (13) arranged on the outer surface (12).