Modular Table Frame Conical Joint for Play-Free Assembly
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Solution Overview
Problem
Existing connection methods for table frame profiles lack a reliable, play-free connection that is not dependent on the outer shape or tolerances of the profiles, and do not allow for easy assembly and adjustment.
Innovation Solution
A connecting device featuring cone-shaped projections that initially fit into complementary recesses for form-fitting assembly, transitioning into a force-fitting press fit when tightened, allowing for a wide range of inclination angles and enabling both positive and non-positive connections, with features like openings or blind holes for additional stability and adjustability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional connection methods are used, then assembly is relatively simple, but the connection has play and is dependent on profile shape and tolerances
Solution Approach 1:
The connecting device is divided into multiple components: a first component with a conical projection, a second component with a complementary conical recess, and connecting elements (screws/bolts). This segmentation allows each part to have a specific function - the conical surfaces provide form-fitting alignment while the connecting elements provide force-fitting clamping, resolving the contradiction between assembly simplicity and connection stability.
Solution Approach 2:
The connection transitions from a form-fitting state (during initial assembly) to a force-fitting state (when connecting elements are tightened). This parameter change in the connection mode eliminates play and makes the connection independent of profile tolerances, while the modular design keeps assembly simple.
2Ease of operation
If form-fitting connection is used, then assembly is easy, but the connection has play and is not stable
Solution Approach 1:
The conical projections and recesses are designed to provide preliminary form-fitting alignment during assembly, guiding the components into correct position. This preliminary action simplifies assembly, while the subsequent tightening of connecting elements eliminates play and provides stable force-fitting connection.
Solution Approach 2:
The connection transitions dynamically from a form-fitting state (easy assembly) to a force-fitting state (stable connection). The conical surfaces enable easy initial insertion, while the connecting elements provide the clamping force needed to eliminate play and achieve stability.
3Reliability
If connecting elements are exposed, then connection is secure, but visual appearance is compromised
Solution Approach 1:
The connecting elements (screws/bolts) are nested within the components - they pass through openings in the first component and engage with threaded holes or nuts in the second component. This nesting conceals the fastening elements within the structure of the connecting device itself, maintaining visual appearance while ensuring secure connection.
Solution Approach 2:
The conical components act as intermediaries that conceal the connecting elements. The first and second components with their conical surfaces and openings serve as mediators between the visible profile surfaces and the hidden fastening mechanism, allowing secure connection without exposed hardware.
Data Source
AI summary
The device has multiple component parts (3) with an outside surface (4), an inside surface (5) and side surfaces (6). A projection (7) is arranged at the inside surface. The projection of the component part is formed as cone-shaped. The cone-shaped projection has an end connected with the component parts and a free end. The cone-shaped projection is tapered in the direction of the free end. An independent claim is also included for a modular structural unit has profile and connecting device.