Stop Apparatus Blade Dynamics for Reduced Resistance
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Solution Overview
Problem
Existing stop apparatuses with multiple blades face increased resistance and potential damage during operation due to tight superposition of blades, especially when transitioning to smaller opening diameters, and existing solutions either require multiple blade sets or complex bending mechanisms, which increase costs and complexity.
Innovation Solution
A stop apparatus with a combination of close and non-close blades, where close blades drive towards closing and non-close blades drive towards opening, reducing mutual superposition and resistance, and utilizing specific cam shapes to manage blade movement and minimize friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the number of stop blades is increased to approximate the stop opening shape to a circle, then the stop opening shape quality is improved, but the resistance against opening/closing operations is augmented
Solution Approach 1:
The patent applies dynamics by dividing stop blades into two functional groups: close blades that rotate to close the opening and non-close blades that rotate to open the opening. This dynamic differentiation allows each blade type to perform its specific function optimally, reducing resistance during closing operations while maintaining the circular stop opening shape through the coordinated action of multiple blades.
Solution Approach 2:
The patent segments the stop blades into distinct categories: close blades and non-close blades, each with specific rotation functions. This segmentation allows the system to manage the complexity of multiple blades by assigning specialized roles, thereby reducing the resistance issue while maintaining the desired circular opening shape.
2Shape
If the number of stop blades is increased to form a circular stop opening, then the stop opening shape is improved, but the risk of blade damage and malfunction increases
Solution Approach 1:
By dynamically assigning different rotation functions to close blades and non-close blades, the patent reduces the mechanical stress and resistance on individual blades during closing operations. This dynamic functional differentiation enhances blade operation reliability while maintaining the circular stop opening shape through the coordinated action of the blade groups.
3Force
If multiple sets of blades are mounted to reduce resistance at different opening diameters, then the resistance problem is solved, but the device complexity and cost increase
Solution Approach 1:
The patent applies universality by designing a single set of stop blades that includes both close blades and non-close blades, capable of performing multiple functions: closing the opening, opening the opening, and maintaining the circular shape. This multi-functional design eliminates the need for multiple separate blade sets, thereby reducing device complexity and cost while effectively managing resistance.
4Force
If stop blades are previously bent to control flexure direction and quantity, then friction between superposed blades is reduced, but the working difficulty and management complexity increase
Solution Approach 1:
Instead of statically bending blades beforehand, the patent employs dynamic rotation control where close blades and non-close blades rotate in specific directions during operation. This dynamic approach reduces friction between superposed blades through controlled movement while avoiding the manufacturing and management complexities of pre-bending, as the blade configuration is adjusted during operation rather than during manufacturing.
Data Source
AI summary
A stop apparatus including stop blades; a supporting member supporting stop blades rotatably about rotating centers; and a rotating member rotating the stop blades, one of the stop blades or the rotating members, having protruded parts, and the other having recessed parts engaging with the protruded parts, the stop blades including: close blades forming close state by rotating in a direction of closing an opening both during stopping down the opening from open state to predetermined opening diameter state and during stopping down the opening from the predetermined opening diameter state to the close state; and non-close blades rotating in the direction of closing the opening during stopping down the opening from the open state to the predetermined opening diameter state and rotating in a direction of opening the opening during stopping down the opening from the open state from the predetermined opening diameter state to the close state.