Umbrella Laundry Dryer Toggle Lever for Low-Force Unfolding
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Solution Overview
Problem
Umbrella-like laundry dryers require significant force and length of hoisting line for unfolding, leading to slow operation and entanglement issues, especially with block-and-tackle systems that increase line length and complexity.
Innovation Solution
An improved actuating device with a toggle lever and adjustable line engagement elements, coupled with a gas-filled compression spring, simplifies the unfolding process by providing force multiplication and adjusting hoisting line length to match longer clothes lines, reducing the need for excessive line length and manual effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a block-and-tackle system is used for force multiplication, then the required force for unfolding is reduced, but the hoisting line length increases significantly (3 times for doubling force, 5 times for quadrupling force)
Solution Approach 1:
The patent applies a toggle lever mechanism that dynamically changes the mechanical advantage during the unfolding process. The lever transitions from a retracted position to an extended position, providing force multiplication only when needed during the final section of unfolding, rather than requiring continuous force multiplication throughout the entire motion.
Solution Approach 2:
The unfolding process is segmented into different phases: initial unfolding requiring minimal force, and final section requiring high force for tensioning. The toggle lever provides force multiplication only in the final segment, avoiding the need for excessive hoisting line length during the earlier phases.
2Force
If a block-and-tackle system is used, then force multiplication is achieved, but the unfolding operation becomes slower due to the increased line length that must be pulled through
Solution Approach 1:
The toggle lever mechanism provides force multiplication dynamically during the final phase of unfolding, allowing rapid deployment without the continuous friction and line manipulation required by a block-and-tackle system throughout the entire motion.
Solution Approach 2:
The force multiplication function is extracted from a continuous block-and-tackle system and applied only where needed - in the final section of the unfolding motion - thereby eliminating the slowdown caused by manipulating excessive line length through multiple pulleys.
3Force
If a block-and-tackle system is used, then force multiplication is achieved, but the hoisting line becomes prone to entanglement and requires frequent freeing from knots and dirt
Solution Approach 1:
The toggle lever provides force multiplication in a controlled, localized manner during the final unfolding phase, minimizing the hoisting line's exposure to entanglement risks compared to a block-and-tackle system where the line must continuously pass through multiple pulleys.
Solution Approach 2:
The force multiplication function is extracted from a complex multi-pulley system and implemented through a simpler toggle lever mechanism, thereby removing the multiple contact points where knots and dirt could accumulate and cause reliability issues.
4Ease of operation
If the carrying framework is designed to unfold completely, then the clothes line can be fully tensioned, but a great amount of force is required in the last section of the unfolding movement
Solution Approach 1:
The toggle lever mechanism dynamically increases mechanical advantage as the unfolding progresses, providing minimal resistance during initial movement and then delivering high force multiplication in the final section to tension the clothes line without requiring excessive manual force throughout the entire motion.
Solution Approach 2:
The toggle lever combines the unfolding motion with force multiplication in a single integrated mechanism, allowing the framework to unfold completely while the lever provides force assistance precisely when needed for tensioning, rather than requiring constant high force input.
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 enhances the efficiency of unfolding the clothes-line carrying framework, allowing for easier tensioning of longer clothes lines with reduced manual force and line length requirements, while maintaining the framework in a tensioned state.
Implementation Method 1
coupled with a gas-filled compression spring, simplifies the unfolding process by providing force multiplication
Implementation Method 2
An improved actuating device with a toggle lever and adjustable line engagement elements, coupled with a gas-filled compression spring, simplifies the unfolding process by providing force multiplication
Implementation Method 3
The actuating device has a hoisting line which is anchored at its upper end to the upper end section of the upright tube, runs downward parallel to the upright tube and is deflected away from the upright tube at the lower sleeve of the carrying framework
Data Source
AI summary
An umbrella-like laundry dryer includes a central upright tube and a clothes-line-carrying framework, which can be unfolded by an actuating device and has supporting arms connected movably to an upper end section of the upright tube and clothes-line carrying arms connected for articulation to lower ends of the supporting arms and linked to a lower sleeve to be displaced along the upright tube. The actuating device has a hoisting line anchored to the upper end section of the upright tube, running downward parallel to the upright tube and deflected away at the lower sleeve from the upright tube. The hoisting line is coupled to an opening lever linked to a clothes-line carrying arm above the lower sleeve for pivoting from a downwardly pointing, lower position into an upwardly pointing, upper position, to unfold the carrying framework.