Expandable Plug-In Connecting Device for Non-Visible Separable Joints
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Solution Overview
Problem
Existing connecting devices for mechanical components often require visible holes and complex production processes, making them expensive and difficult to manufacture, especially when aiming for a separable and non-visible connection.
Innovation Solution
A connecting device with a partly hollow, flexible plug-in part and a movable fixing device that generates a uniformly distributed force, allowing for a non-visible and easily manufacturable separable connection, with optional tool-free operation and adaptable surface structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inside surface of the plug-in part is shaped to accommodate the fixing device in idle position without spreading, then the fixing device can be received entirely, but the production of the connecting device becomes more difficult and expensive
Solution Approach 1:
The plug-in part is designed with flexible walls that can dynamically change shape. In the idle position, the walls are compact to receive the fixing device. During actuation, the walls flex outward to enable expansion. This dynamic flexibility eliminates the need for complex pre-shaped internal surfaces, simplifying manufacturing while ensuring reliable fixing device reception.
Solution Approach 2:
The physical state of the plug-in part walls changes from a compact configuration in the idle position to an expanded configuration during actuation. This parameter change in wall position and shape allows the same simple internal surface to accommodate both the idle fixing device and the expanded state, avoiding complex manufacturing requirements.
2Ease of operation
If conventional connecting devices are used to achieve separable connection, then connection is possible, but visible holes are created
Solution Approach 1:
The plug-in part is designed as a flexible hollow structure with closed front end. When expanded, it creates a bulbous shape that can be concealed within furniture components or covered by decorative elements. The flexibility allows it to be inserted through small openings and then expanded to create a secure, hidden connection point.
3Strength
If the plug-in part is expanded by pushing the wall apart, then the fixing device can be secured, but complex surface adaptations are required
Solution Approach 1:
The invention uses a simple cylindrical internal surface that remains unchanged during manufacturing. The expansion is achieved by changing the radial position of the flexible walls during actuation, not by complex surface adaptations. This parameter change in wall position during operation maintains manufacturing simplicity while providing strong fixing force.
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
Simplifies production, reduces costs, and enhances static friction through uniform force distribution, enabling secure and space-efficient connections without the need for complex surface adaptations or additional tools.
Implementation Method 1
The inside surface of the plug-in part need not be adapted to the outside surface of the fixing device, the production of the connecting device is simplified and thus economical
Data Source
AI summary
A connecting device having a hollow-body-like plug-in part which is of variable outer circumference and which interacts with a fixing device which is at least partially insertable into the plug-in part, wherein the fixing device is connectable to an actuation section which projects out of the plug-in part. Here, the plug-in part, with the fixing device inserted therein and with the actuation section connected thereto, has the minimum external shape thereof in terms of the dimensions thereof when the actuation section is in a rest position. The actuation section is moved by means of axial or radial movement relative to the plug-in part into a working position in which the plug-in part has the maximum external shape thereof in terms of the dimensions thereof, wherein the plug-in part has a closed shape on its side situated opposite the insertion side of the fixing device.