Telescopic Rod Friction Locking for Stable Positioning
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Solution Overview
Problem
Existing telescopic rods have complex locking mechanisms that affect the integrity and stability of the structure, particularly in applications like curtain and door curtain rods.
Innovation Solution
A telescopic rod design featuring an inner tube with a limiting portion and a positioning member connected to an elastic portion, where elastic expansion members form static friction with the outer tube, allowing for simple and stable locking and unlocking through rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism with bolts and connection locking sleeve is used, then the telescopic rod can achieve locking function, but the structure becomes complex and the external locking structure affects the integrity of the telescopic rod
Solution Approach 1:
The patent extracts the locking function from a complex external locking mechanism (bolts, connection locking sleeve) and integrates it into a simplified internal structure where the inner tube itself forms the locking mechanism through its tapered outer surface and corresponding groove, eliminating the need for separate locking components and thus reducing structural complexity while maintaining locking reliability
Solution Approach 2:
The patent merges the locking mechanism with the inner tube structure by integrating the tapered outer surface and the groove directly into the inner tube, combining the structural support function and the locking function into a single integrated component, thereby simplifying the overall structure while ensuring reliable locking
2Manufacturing precision
If excessive processing is applied to the tubes, then the locking mechanism can be more precise, but the manufacturing complexity and processing time increase
Solution Approach 1:
The patent applies local quality by providing precise machining only where necessary - specifically on the outer surface of the inner tube where the tapered locking surface and groove are located - while leaving the rest of the tubes with standard finishing, thus achieving the required locking precision without subjecting the entire structure to excessive processing
Solution Approach 2:
The patent incorporates the locking features (tapered outer surface and groove) directly into the tube manufacturing process itself, performing the precision machining as a preliminary action during tube production rather than as a separate post-processing step, which reduces overall manufacturing complexity while ensuring precise locking geometry
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
The design enables secure locking and unlocking of the telescopic rod at any position without excessive processing, ensuring a stable and noise-free operation.
Implementation Method 1
the elastic expansion members form static friction with an inner wall of the outer tube; when the inner tube and the outer tube are rotated relative to each other, the static friction between the outer tube and the elastic expansion members drives the elastic portion to move along the positioning member
Data Source
AI summary
A telescopic rod and a telescopic structure are provided. The telescopic rod includes an inner tube and an outer tube, an end portion of the inner tube extending into the outer tube is used as an extension end and is provided with a limiting portion, a bottom portion of the limiting portion is connected to the extension end, an outer diameter of an outer peripheral wall of the limiting portion gradually increases from the bottom portion to a top portion thereof, a positioning member is slidably connected with an elastic portion, the elastic portion has elastic expansion members, and the elastic expansion members form static friction with an inner wall of the outer tube, which result in a simple structure, convenient operation and very stable locking.