Segmented Umbrella Rib Linkage for Wind Resistance
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Solution Overview
Problem
Conventional umbrellas are prone to flipping inside out in windy conditions due to the large size of the canopy, rendering them ineffective in windy and rainy weather.
Innovation Solution
The design incorporates a shaft with pivotably connected rib units, including first, second, and third ribs, and a link unit with a joint and positioning member to distribute wind force, preventing deformation of the ribs and enhancing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the canopy is made large to provide adequate coverage, then the protective function is improved, but the umbrella becomes prone to flipping inside out in windy conditions
Solution Approach 1:
The rib structure is divided into multiple segments (first rib, second rib, third rib) connected by joints, allowing each segment to move independently to distribute wind force and prevent canopy inversion
Solution Approach 2:
The rib joints are designed to be movable rather than fixed, enabling the rib structure to dynamically adjust and flex under wind load, preventing the rigid structure from flipping inside out
2Strength
If the rib structure is made rigid to maintain shape, then the structural strength is improved, but the ribs become prone to deformation under strong wind force
Solution Approach 1:
The rib joints are designed as movable connections that allow the rib structure to flex and adapt under wind load, preventing deformation while maintaining overall structural integrity
Solution Approach 2:
The joint acts as an intermediary element between rib segments, absorbing and distributing wind force to prevent direct stress concentration that would cause rib deformation
Data Source
AI summary
An umbrella includes a shaft, a top cap and a runner. Multiple rib units and multiple stretchers are pivotably connected to the top cap and the runner. The rib units each have a first rib, a second rib and a third rib. The first, second and third ribs are pivotably connected in sequence. A canopy is mounted to the rib units. The second ribs each have a first connection portion on one end thereof, and the first connection portion has a seat which is connected to a link unit. The link unit has a joint which is connected to the third rib. The third rib has a positioning member to position the joint. The third rib and the joint are connected with each other to bear wind force applied to the second rib and the third rib, such that the second and third ribs do not deform.