Fixture Set Anchor Rotation Restriction
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Solution Overview
Problem
Existing fixing devices for accessories on hollow or plate-like walls face challenges with insufficient strength, require special tools, and struggle with rotation issues when using bolt and nut systems, especially on thin or soft walls.
Innovation Solution
A fixture set comprising a bolt, anchor, and splitter with an intermediate accessory piece that restricts the splitter's rotation relative to the accessory part, allowing robust anchor expansion without special tools, using a solid connection or form-locking mechanisms to prevent anchor rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bolt and nut fixing system is used, then the fixing strength is improved, but the complexity of operation increases due to rotation issues requiring special tools
Solution Approach 1:
The patent introduces a splitter as an intermediary component between the bolt and the anchor. The splitter has a non-circular cross-section that engages with a corresponding feature in the anchor, preventing rotation of the anchor while the bolt is being tightened. This mediator component allows the bolt-nut system to achieve high fixing strength without the operational complexity of preventing anchor rotation
Solution Approach 2:
The anchor is designed with a non-circular hole or groove that matches the splitter's cross-section before the bolt is inserted. This preliminary configuration ensures that when the splitter is placed in the anchor, rotation is automatically prevented without requiring additional tools or actions during the tightening process
2Strength
If the anchor is made robust to expand on thin or soft walls, then the anchoring strength is improved, but the torque required for expansion increases
Solution Approach 1:
The anchor features radially expandable parts that can dynamically adjust their configuration. When the bolt is tightened, these parts expand radially to engage the back surface of the wall. The dynamic expansion allows the anchor to adapt to thin or soft walls without requiring excessive torque, as the expansion force is applied gradually through the threaded engagement of the bolt
Solution Approach 2:
The anchor is divided into multiple radially expandable segments or parts. This segmentation allows each part to expand independently and progressively, distributing the expansion force and reducing the peak torque required. The segmented structure enables robust anchoring on thin or soft walls by allowing controlled expansion without overwhelming the wall material
3Ease of operation
If the splitter is press-fitted into the hole, then the rotation prevention is improved, but the applicability to thin or soft walls deteriorates
Solution Approach 1:
The splitter is designed to work dynamically with the expandable anchor parts rather than relying on a static press-fit. As the bolt tightens and the anchor expands, the splitter rotates slightly to engage the non-circular features, providing rotation prevention without requiring a tight press-fit into the wall hole. This dynamic engagement maintains applicability to thin or soft walls
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 easy and secure fixation of accessories on thin or soft walls without requiring special tools, ensuring robust anchoring and simplifying the installation process by reducing the need to hold separate spanners.
Implementation Method 1
The anchor is entirely inserted in the hole in the wall and comprises at least two parts which are radially expandable by the splitter, when tightening the bolt
Implementation Method 2
Both the splitter and the anchor comprise mutually interlockable structures for substantially restricting rotation of the anchor relative to the splitter
Data Source
AI summary
A fixture set includes an accessory part, and at least one means for fixing the accessory part to a front surface of a wall of a hollow frame, through a hole provided through the wall. The fixing means includes an anchor, a bolt screwed into the anchor and a splitter arranged between the head of the bolt and the anchor. The anchor is entirely inserted in the hole and includes at least two parts which are radially expandable by the splitter, when tightening the bolt, to lock the anchor against the back surface of the wall. The splitter and the anchor include mutually interlockable structures for substantially restricting rotation of the anchor relative to the splitter. The accessory part, or an intermediate accessory piece arranged between the accessory part and the wall, includes a solid connection for substantially restricting rotation of the splitter relative to the accessory part.