Fastener Guide with Depth Adjustment and Anti-Rotation
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Solution Overview
Problem
Existing fastener insertion devices lack precision in controlling the depth and stand-off height of screws, particularly in thin materials to prevent over-insertion and material fracture, and fail to ensure uniformity in multiple screw installations.
Innovation Solution
A fastener guide with a shaft, sleeve, depth-adjustment ring, and anti-rotation ring that allows for adjustable torque transfer and precise control of screw depth and stand-off height, featuring a threaded portion, axial groove, and detent mechanism to prevent unintentional rotation and ensure consistent screw placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a simple guide device is used for fastener insertion, then the device complexity is low, but the manufacturing precision and control over fastener depth and stand-off height are insufficient
Solution Approach 1:
The guide device is divided into multiple functional components: a body defining a guide bore, a separately adjustable depth stop mechanism with threaded engagement, and a stand-off height adjustment mechanism. This segmentation allows each component to be optimized independently for its specific function while maintaining overall precision.
Solution Approach 2:
The depth stop and stand-off height mechanisms are designed to be adjustable rather than fixed. The depth stop can be positioned at different locations along the guide bore using threaded engagement, and the stand-off height can be modified by adjusting the position of the guide bore relative to the body. This dynamic adjustability enables precise control for different fastening requirements.
2Adaptability or versatility
If a fixed guide device is used, then the device complexity is low, but the adaptability to different fastener depths and stand-off heights is poor
Solution Approach 1:
The guide device incorporates dynamic adjustment capabilities through a depth stop that can be repositioned along the guide bore and a stand-off height mechanism that allows modification of the guide bore position. These dynamic elements enable the same device to adapt to various fastener depths and stand-off height requirements without requiring multiple specialized tools.
Solution Approach 2:
The device allows changing of critical parameters (fastener depth and stand-off height) through mechanical adjustment mechanisms. The depth stop position can be varied by rotating it along the threaded portion, and the stand-off height can be modified by adjusting the relative position of the guide bore, enabling parameter changes without replacing the entire device.
3Manufacturing precision
If manual fastener insertion is performed without a guide, then the operation is simple, but the consistency and uniformity of multiple screw installations cannot be ensured
Solution Approach 1:
The guide device performs preliminary positioning actions by defining a precise guide bore that predetermined the fastener insertion path and depth. The depth stop is pre-positioned at the desired depth location, and the stand-off height is pre-adjusted before fastener insertion begins. This preliminary setup ensures that subsequent fastener installations are consistent and uniform without requiring complex real-time control during operation.
Solution Approach 2:
The guide bore acts as an intermediary element between the operator and the fastener insertion process. It mediates the insertion by constraining the fastener to a precise path and depth, ensuring uniformity across multiple installations. The guide bore translates the operator's simple insertion action into precise, repeatable fastener placement.
4Strength
If the screw can be inserted deeply into the material, then the fastening strength is high, but the risk of over-insertion and material fracture increases
Solution Approach 1:
The depth stop mechanism provides preliminary anti-action by preventing the fastener from being inserted beyond the desired depth. The depth stop is positioned at the maximum safe insertion depth before fastening begins, creating a mechanical barrier that stops further insertion. This preliminary protective action ensures that the fastener achieves sufficient depth for strong fastening while preventing over-insertion that could cause material fracture or the fastener to protrude through the opposite side.
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
Enables precise and repeatable insertion of fasteners to a desired depth and stand-off height, preventing over-insertion and material damage, while ensuring uniformity in multiple screw installations, thereby enhancing operational safety and efficiency.
Implementation Method 1
a shaft having a first end for transferring torque to a fastener and a second end for receiving a torque from an external source
Implementation Method 2
a detent ring for selectively engaging the axial groove
Implementation Method 3
a depth-adjustment ring having a threaded inner surface for engaging the threaded portion of the sleeve
Implementation Method 4
an anti-rotation ring disposed between the sleeve and the depth-adjustment ring and having a locating tab disposed in the axial groove for inhibiting rotation of the anti-rotation ring
Data Source
AI summary
A fastener guide includes a shaft having a first end for transferring torque to a fastener and a second end for receiving a torque from an external source, the shaft including a threaded portion and an axial groove extending axially along the threaded portion. The fastener guide also includes a sleeve slidable axially with respect to the shaft, the sleeve having a first end proximate the first end of the shaft and a second end proximate the second end of the shaft, and a depth-adjustment ring having a threaded inner surface for engaging the threaded portion of the sleeve and a detent ring for selectively engaging the axial groove.