Umbrella Middle Rod Elastic Element Deformation Control
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Solution Overview
Problem
The middle rod structure of automatic umbrellas is prone to tube burst due to deformation of the elastic element over time, leading to exposure during folding and unfolding processes.
Innovation Solution
Incorporating an adjustment element to adjust the length of the elastic element, which includes a movable adjustment sleeve and rod, and a second elastic element to distribute compression force, reducing deformation and pressure on the first elastic element, thereby preventing sleeve burst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long elastic element is used in the middle rod, then the automatic folding and unfolding function is achieved, but the elastic element is prone to deformation and bursts the outer sleeve after long time use
Solution Approach 1:
The patent divides the single long elastic element into multiple shorter elastic elements (first elastic element and second elastic element) arranged in parallel. This segmentation reduces the length of each individual elastic element, thereby decreasing their susceptibility to deformation and bursting while maintaining the overall automatic folding and unfolding function through the combined action of multiple elements.
Solution Approach 2:
The patent introduces an adjustment element that allows local modification of the elastic element system. By adjusting the position or configuration of the elastic elements locally, the system optimizes the distribution of compression forces and reduces stress concentration on any single element, thereby improving overall durability and resistance to deformation.
2Ease of operation
If the length of elastic element is increased, then the automatic unfolding function is achieved, but transverse deformation increases causing sleeve burst
Solution Approach 1:
The patent segments the long elastic element into multiple shorter elements, which reduces transverse deformation in each individual element while maintaining the automatic unfolding function. The multiple shorter elements work together to provide the necessary elastic force without the excessive transverse deformation that occurs in a single long element.
Solution Approach 2:
The patent changes the physical parameters of the elastic element system by reducing the length parameter and increasing the quantity of elements. This parameter change reduces the transverse deformation characteristic while preserving the functional requirement of automatic unfolding through the collective elastic response of multiple elements.
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 adjustment element reduces transverse deformation of the elastic element, preventing sleeve burst and allowing for use in umbrellas of varying sizes, while maintaining efficient automatic folding and unfolding operations.
Implementation Method 1
a first elastic element, held in the outer sleeve and capable of applying a pressure along, a longitudinal direction, to the movable sleeve abutted against a first elastic element lower end of the first elastic element when being compressed
Implementation Method 2
a second elastic element to distribute compression force, reducing deformation and pressure on the first elastic element
Data Source
AI summary
Provided is an automatic umbrella. The middle rod structure comprises an outer sleeve; a movable sleeve; a first elastic element; a locating element; an adjustment element; and a long rod comprising a long rod upper end and a long rod lower end; wherein the long rod upper end is abutted against the adjustment element, and the long rod lower end is located inside the movable sleeve for limiting the first elastic element from moving along a direction perpendicular to the longitudinal direction.