Anchor Bolt Anti-Rotation Sleeve and Fitting Design
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Solution Overview
Problem
Existing anchor bolts often experience rotation issues when a nut is tightened, requiring manual effort to prevent the shaft and sleeve from rotating together, which is cumbersome and inefficient.
Innovation Solution
An anchor bolt design featuring a hollow sleeve with an expandable portion and a ring that contacts the mounting hole's inner wall, preventing rotation by friction, and a fitting piece that connects the shaft and sleeve, ensuring they remain fixed during nut rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sleeve is frictionally contacted with the mounting hole to prevent rotation, then the shaft and sleeve can be held stationary, but the friction force varies due to hole diameter variation causing the sleeve to rotate with the shaft
Solution Approach 1:
The invention divides the anti-rotation function into two independent components: the ring that contacts the mounting hole to prevent sleeve rotation, and the fitting piece that connects the shaft and sleeve to prevent relative rotation between them. This segmentation ensures that each component performs its specific function independently, eliminating the need for manual intervention.
Solution Approach 2:
The ring acts as an intermediary element between the sleeve and the mounting hole, providing a reliable friction-based connection that prevents sleeve rotation. The fitting piece serves as an intermediary connector between the shaft and sleeve, ensuring they remain fixed relative to each other during nut rotation.
2Productivity
If the nut is rotated to tighten the component, then the component can be mounted on the wall, but the shaft and sleeve rotate together with the nut requiring manual holding
Solution Approach 1:
The invention segments the rotation prevention function into two parts: the ring preventing sleeve rotation against the mounting hole, and the fitting piece preventing relative rotation between shaft and sleeve. This allows the nut to be rotated freely without requiring manual holding of the bolt, improving tightening efficiency.
Solution Approach 2:
The ring and fitting piece automatically prevent rotation during the tightening process without requiring external manual intervention. The system serves itself by design, eliminating the need for the operator to simultaneously rotate the nut and hold the bolt with another tool.
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
This design prevents the shaft and sleeve from rotating with the nut, enhancing work efficiency by eliminating the need to manually hold the bolt to prevent rotation, thus simplifying the tightening process.
Implementation Method 1
The outer peripheral surface of the sleeve fitted to the shaft of the anchor bolt is in contact with the inner peripheral surface of the mounting hole. The shaft and the sleeve are frictionally in contact with each other, and the sleeve is fixed to the inner peripheral surface of the mounting hole.
Implementation Method 2
the sleeve including an expandable portion formed at its distal end, the expandable portion being configured to bend outwardly to be in an expanded state
Data Source
AI summary
An anchor bolt inserted in a mounting hole includes: a shaft including an expanded diameter portion formed on its distal end, the expanded diameter portion having a tapered outer peripheral surface; a sleeve, into which the shaft is inserted from the proximal end side of the shaft, such that the sleeve covers an outer peripheral surface of the shaft, the sleeve including an expandable portion, which is configured to bend outwardly along the expanded diameter portion when pushed from an insertion complete state of the shaft; and a fitting piece connecting the shaft and the sleeve. A first recessed groove is formed in a peripheral surface of the sleeve. A ring, which contacts an inner peripheral wall of the mounting hole, is fitted in the first recessed groove.