Spring-Driven Dishwasher Door Hinge for Partial Opening and Drying
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Solution Overview
Problem
Existing hinges for dishwasher doors, particularly those with motor-driven systems, are costly, complex to install, and difficult to maintain, and they struggle to efficiently compensate for reduced drying air temperatures, leading to less dry dishes.
Innovation Solution
A hinge system comprising a first and second element connected by a pin, a helical spring, and a drive rod, with a rocker and cam mechanism that allows partial door opening without an electric drive unit, facilitating air circulation for improved drying through elastic force and frictional action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If motor-driven hinge systems are used to open the door at the end of the washing cycle, then drying efficiency is improved through air circulation, but manufacturing cost and device complexity increase significantly
Solution Approach 1:
The patent replaces the motor-driven mechanical system with a purely mechanical spring-based system. The spring mechanism automatically opens the door at the end of the washing cycle without requiring electrical motors, control electronics, or complex actuation systems, thereby reducing device complexity while maintaining the air circulation function for improved drying efficiency
Solution Approach 2:
The spring mechanism is designed to automatically open the door at the appropriate time without requiring external control or power supply. The system uses the washing cycle timing and mechanical energy storage to self-activate the door opening function, eliminating the need for motor-driven systems and associated control electronics
2Productivity
If motor-driven hinge systems are used to open the door, then drying efficiency is improved, but installation complexity and maintenance difficulty increase
Solution Approach 1:
The patent replaces complex motor-driven systems with a simple mechanical spring mechanism that has fewer moving parts, no electrical components, and no electronic controls. This substitution dramatically simplifies both installation and maintenance, as the spring system can be easily installed and replaced without requiring electrical wiring or electronic diagnostics
3Productivity
If the door is opened to facilitate air circulation for drying, then drying efficiency is improved, but energy loss increases due to heat escape
Solution Approach 1:
The spring mechanism is designed to open the door only partially rather than fully opening it. This partial opening provides sufficient air circulation to improve drying efficiency while minimizing the heat loss that would occur with a fully open door, thereby optimizing the balance between drying performance and energy conservation
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 hinge system provides an inexpensive, efficient, and easy-to-maintain solution for enhancing drying efficiency by allowing controlled air circulation within the dishwasher, ensuring dishes are adequately dried without the need for motor-driven components.
Implementation Method 1
a helical spring (7), both supported by the second element (3)
Implementation Method 2
a tapered friction element (12), housed in a hole (11) made on the bracket (10)
Data Source
Figure 1~2
Figure 3~4
AI summary
Described is a hinge (1) for doors of dishwashers, comprising a first element (2) and a second element (3) pivoted to each other and movable relative to each other in tilting fashion, a connecting lever (5) between the elements (2, 3), the lever (5) pivoting on the first element (2), the second element (3) supporting a spring (7) connected to the lever (5) by a drive rod (8) which can slide at least partly inside the second box-shaped element (3).|