Spring Braking for Automatic Winding Screens Under Temperature Changes
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Solution Overview
Problem
Automatic winding type screen devices with oil dampers experience varying braking forces due to temperature changes, leading to inconsistent performance and potential oil leakage, making it difficult to maintain stable braking over time.
Innovation Solution
A braking device with a cylindrical housing and a rotatable sleeve, featuring first and second springs that bias the rotation of the winding shaft, eliminating the need for oil and allowing for adjustable braking torque through an adjuster, ensuring stable braking regardless of temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an oil damper is used for braking, then braking force can be provided, but braking performance varies with temperature changes causing unstable operation
Solution Approach 1:
The patent replaces the oil damper (hydraulic system) with a spring-based mechanical braking system. The movable member engages with threaded portions on the shaft, and springs provide the braking force through mechanical contact rather than fluid resistance. This substitution eliminates temperature dependence of oil viscosity, ensuring stable braking performance across temperature variations.
Solution Approach 2:
The patent changes the physical state from fluid-based (oil) to solid-based (spring mechanical force). By using the elastic properties of springs and the mechanical engagement of threaded portions, the system transforms the braking mechanism from a temperature-sensitive hydraulic system to a temperature-stable mechanical system with consistent force characteristics.
2Force
If an oil damper is used for braking, then braking function is achieved, but oil leakage occurs due to repeated extension and contraction
Solution Approach 1:
The patent eliminates the oil damper and its associated oil substance by replacing it with a purely mechanical spring-based system. The movable member with threaded portions engages directly with the shaft, and springs provide braking force through solid mechanical contact, completely avoiding oil leakage issues.
Solution Approach 2:
The patent uses durable solid components (springs, threaded portions, movable member) that have long service lives and do not degrade or leak like oil-based systems. These solid mechanical components can withstand repeated extension and contraction cycles without substance loss.
3Force
If excessive braking force is applied, then impact is moderated, but the screen becomes hard to wind completely
Solution Approach 1:
The patent creates a dynamic braking system where the movable member can move along the shaft's threaded portions. As the shaft rotates during screen winding, the movable member advances or retracts along the threads, allowing the braking force to vary dynamically. This enables the system to provide strong braking when needed while automatically reducing resistance during winding operations.
Solution Approach 2:
The threaded engagement creates a periodic interaction between the movable member and the shaft during rotation. As the shaft turns, the movable member periodically engages and disengages along the threaded portions, creating a rhythm of braking force application that moderates impact while allowing continuous winding progress.
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 solution provides stable braking performance over a long period without oil-related fluctuations, allowing for smooth operation and reduced impact during screen winding, with adjustable torque settings for enhanced functionality.
Implementation Method 1
a first spring (60) and a second spring (70) which are loosely fitted on the shaft part and disposed on both sides of the movable member (40), respectively, wherein the movable member (40) screws in the housing (20) in accordance with the rotation of the housing (20) in a longitudinal direction of the sleeve (30), and biasing forces of the first spring (60) and the second spring (70) extending and contacting in accordance with screwing of the movable member (40) brake the rotation of the winding shaft (5)
Data Source
AI summary
A braking device for an automatic winding type screen device that stably brakes the automatic winding of a screen regardless of the temperature. The braking device comprises: a housing that is provided inside a winding shaft so as to be able to turn with the winding shaft to wind up a screen; a sleeve that is inserted into the housing and is mounted to a bracket so as not to be able to turn; and a mobile element that can rotate with the housing. A first spring and a second spring are provided on the outer side of the sleeve so as to have the mobile element therebetween. The mobile element twists forward on the sleeve along with rotation of the housing, and biasing forces of the first spring and the second spring that expand and contact with the forward twist of the mobile element brakes the rotation of the winding shaft.