Curved Undercut Connector for Stable Low-Complexity Assembly
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Solution Overview
Problem
Existing connecting devices for furniture or machine parts lack a simple and stable method to connect or anchor objects, such as lighting fixtures or clothing, to parts without compromising structural integrity or requiring complex assembly.
Innovation Solution
A connecting device featuring non-self-cutting retaining projections with curved surfaces that fit into grooves with undercut surfaces, allowing for secure anchoring and movement between parts, with optional screw elements and securing devices for additional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional connecting devices are used, then connection stability is achieved, but assembly complexity and difficulty increase
Solution Approach 1:
The connecting element is divided into distinct functional segments: a curved supporting surface for insertion guidance, non-self-cutting retaining projections for secure engagement, and integration features for mounting. This segmentation allows each component to perform its specific function efficiently while simplifying the overall assembly process through modular design.
Solution Approach 2:
The curved supporting surface on the connecting element automatically guides insertion into the groove, and the non-self-cutting retaining projections self-align and engage with the undercut sections during assembly. This self-service mechanism eliminates the need for complex alignment tools or multiple assembly steps, reducing assembly complexity while maintaining connection stability.
2Ease of operation
If non-self-cutting retaining projections with curved surfaces are used, then ease of assembly is improved, but connection strength may be compromised
Solution Approach 1:
The retaining projections feature curved supporting surfaces that match the arc of the groove, enabling smooth guided insertion. The curvature distributes insertion forces evenly along the contact surface, preventing stress concentration while maintaining secure engagement in the undercut sections, thus preserving connection strength despite the simplified assembly process.
Solution Approach 2:
The non-self-cutting retaining projections are designed with asymmetric geometry where the curved supporting surface facilitates easy insertion, while the projection shape itself prevents self-cutting into the groove. This asymmetric design allows the connection to be as strong as traditional designs while enabling simpler, tool-free assembly.
3Reliability
If connecting elements with undercut engagement are used, then connection reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The design changes the engagement parameter from self-cutting (which requires precise control of material removal) to non-self-cutting retaining projections that engage with pre-formed undercut sections. This parameter change allows the groove to be manufactured with standard precision tolerances, as the retaining projections are designed to engage with the undercut geometry rather than requiring precise self-alignment during insertion.
Data Source
AI summary
A connecting device is provided including one or more connecting elements arranged on at least one connectable part. At least one connecting element includes non-self-cutting retaining projections having a curved supporting surface in the form of an arc of a circle in longitudinal section. A groove is provided in one of the connectable parts, the groove having a curved undercut surface in the form of an arc of a circle in longitudinal section and including a base section and two undercut sections which extend away from the base section in a thickness direction. The retaining projections are engageable with the undercut sections of the groove. One or more connecting elements include or are in the form of one or more screw elements, and one or more connecting elements include one or more moveable retaining elements by means of which the parts can be drawn towards and/or pressed against each other.