Screw Anchor Wrench Hub Geometry for Higher Installation Torque
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Solution Overview
Problem
Existing screw anchors struggle to withstand the maximum torque required to be driven into the ground, limiting their ability to meet pile capacity requirements for anchoring loads effectively.
Innovation Solution
The design of screw anchors with a wrench hub, power point, and load plate, featuring torque ribs that enhance the engagement with a drive wrench, allowing the anchors to withstand increased torque during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the anchor is designed with a simple wrench hub, then the device complexity is low, but the torque capacity is insufficient to meet pile capacity requirements
Solution Approach 1:
The patent applies local quality by adding torque ribs only at specific locations on the wrench hub where maximum stress and torque transmission are needed, rather than reinforcing the entire hub structure. This localized reinforcement increases torque capacity while minimizing additional complexity and material usage.
Solution Approach 2:
The patent transitions from a simple two-dimensional hub surface to a three-dimensional structure by adding protruding torque ribs that extend radially outward. This dimensional change creates additional engagement surfaces with the drive wrench, significantly increasing torque capacity through enhanced mechanical interlocking.
2Reliability
If the anchor is driven at a 45-degree angle to achieve proper guy wire positioning, then the anchoring effectiveness is improved, but the torque required to drive the anchor exceeds the maximum torque rating of the anchor
Solution Approach 1:
The patent changes the geometric parameters of the wrench hub by adding torque ribs with specific dimensions, spacing, and angles. These parameter changes increase the mechanical advantage and torque multiplication factor, allowing the anchor to withstand the higher torques required when driven at the optimal 45-degree angle for reliable anchoring.
3Strength
If the surface area contact between the wrench hub and drive wrench is increased, then the torque capacity is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the torque transmission function by dividing the wrench hub surface into multiple discrete torque ribs rather than creating a single large complex surface. Each rib is a simple, standardized geometric feature that can be manufactured independently, reducing overall manufacturing complexity while collectively providing large surface area contact for high torque capacity.
Data Source
AI summary
The present disclosure provides embodiments of anchors and screw anchor kits. The anchors are used to pull anchor rods used for anchoring loads to the ground. The anchors may include a wrench hub, a power point and a helical plate. The screw anchor kits may include an anchor and an anchor rod. The screw anchor kits may also include a drive wrench used to drive the anchor and anchor rod into the ground, and an eyelet that can be attached to an end of the anchor rod extending above the ground.