Locking Artificial Tree Trunk Assembly Without Rotational Alignment
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Solution Overview
Problem
Artificial trees often require complex assembly due to specific rotational alignment requirements of trunk sections, which can lead to aesthetic and safety issues, particularly with pre-lit trees where internal wiring can be damaged by rotation.
Innovation Solution
The development of modular tree portions with locking trunk mechanisms that allow secure coupling in multiple rotational orientations, preventing twisting and rotation, thereby simplifying assembly and maintaining the integrity of internal wiring and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tree sections are designed with specific rotational alignment requirements to prevent twisting, then aesthetic appearance and wiring integrity are improved, but assembly difficulty increases
Solution Approach 1:
The trunk is divided into multiple modular sections with standardized interfaces. Each section has a trunk receptacle with a locking mechanism that segments the rotational constraint function, allowing independent assembly of sections while maintaining overall rotational stability when connected
Solution Approach 2:
The locking mechanism is pre-configured in the trunk receptacle with a cam surface and detent position established before assembly. When the trunk section is inserted, the cam surface automatically guides the locking member into the detent position, performing the rotational alignment action preliminarily and automatically without requiring user intervention for precise orientation
2Ease of operation
If tree sections allow universal insertion without rotational orientation requirements, then assembly ease is improved, but twisting and rotation of sections occur
Solution Approach 1:
The locking mechanism transitions from a static fixed-position constraint to a dynamic assembly process. During insertion, the mechanism allows movement and rotation freedom, then automatically locks into a stable rotational position through the cam surface and detent, providing both assembly ease and rotational stability
Solution Approach 2:
The trunk receptacle locking mechanism is self-aligning and self-locking. When trunk sections are inserted, the cam surface and detent automatically engage without requiring user alignment actions, and the mechanism self-locks to prevent rotation, making the system service itself rather than requiring continuous user intervention
3Stability of the object's composition
If a locking mechanism is added to prevent rotation of trunk sections, then rotational stability is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is merged with the trunk receptacle structure itself rather than being a separate component. The cam surface, locking member, and detent are integrated into the receptacle housing, combining the structural support function with the rotational locking function in a single unified component
Solution Approach 2:
The complex multi-component mechanical locking systems of prior art are replaced with a simplified cam-and-detent mechanism. This substitution uses basic mechanical elements (cam surface, detent position, spring-loaded member) to achieve reliable rotational locking with fewer parts and simpler assembly
Data Source
AI summary
A tree trunk system for an artificial decorative tree includes a first trunk body defining a first central axis extending from a distal end to a proximal end, the distal end having an insertable portion defining a plurality of channels, and a second trunk body having a proximal end configured to receive the insertable portion of the first trunk body and having a protuberance extending radially inward. When the trunk bodies are coupled, thereby preventing rotation of the first trunk body relative the second trunk body, about the common central axis.