Dishwasher Door Mechanical Locking to Prevent Uncontrolled Opening
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Solution Overview
Problem
Existing domestic dishwashers lack a reliable mechanism to prevent the door from opening uncontrollably, which can lead to user injury and require expensive electronic components for monitoring and control.
Innovation Solution
A purely mechanical locking device is introduced, comprising an engagement element and a counter-engagement element, where the engagement element is spring-biased to lock the door in case of damage to the pretensioning device, preventing uncontrolled opening and allowing manual opening even when damaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring-biased door mechanism is used to automatically close the door, then the door can be kept closed without manual intervention, but the door may open uncontrollably if the spring is damaged, causing safety hazards
Solution Approach 1:
The locking device is designed to preemptively counteract the potential harmful effect of a damaged spring by automatically engaging the locking elements before uncontrolled door opening can occur. The spring-loaded locking mechanism ensures that if the door-closing spring fails, the locking elements immediately prevent dangerous door movement.
Solution Approach 2:
The locking device acts as a protective measure prepared in advance against the failure of the door-closing spring. By having the locking mechanism ready and spring-biased into position, the system cushions against the potential harm of uncontrolled door opening, ensuring safety even when the primary door-closing spring is damaged.
2Reliability
If electronic monitoring components are added to detect spring faults and control door opening, then door safety can be improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The locking device is designed to automatically detect and respond to spring failures without requiring external electronic monitoring or control systems. The spring-biased locking elements self-activate when the door-closing spring is damaged, and the mechanical interlocking mechanism automatically prevents door opening, making the system self-monitoring and self-protecting.
Solution Approach 2:
The patent replaces electronic monitoring and control systems with a purely mechanical locking device that uses spring biasing and mechanical interlocking to detect spring failures and control door opening. This mechanical substitution eliminates the need for sensors, electronic controllers, and associated complexity while maintaining safety functionality.
3Reliability
If a locking device is added to prevent uncontrolled door opening, then user safety is improved, but the device complexity increases
Solution Approach 1:
The locking device is integrated with the existing door-closing spring mechanism, combining the spring biasing function with the locking function in a single unified system. The locking elements are positioned to work in conjunction with the door-closing spring, merging two functions (door closing and door locking) into one integrated mechanism rather than adding a completely separate system.
Solution Approach 2:
The spring-biased locking mechanism serves multiple functions: it normally remains disengaged to allow door operation, automatically locks when the door-closing spring is damaged, and can be manually released. This multi-functional design provides safety locking, normal door operation, and manual override capabilities within a single mechanism, reducing overall system complexity.
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 ensures the door cannot open uncontrolled, preventing user injury and eliminating the need for expensive electronic components, while allowing access to the washing compartment even when the pretensioning device is damaged.
Implementation Method 1
an engagement element (23), which is spring-biased in a direction towards a disengaged position in which the locking device (22) does not lock the door (3)
Data Source
Figure 1
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Figure 3
AI summary
The invention relates to a household dishwasher (1) with a wash tub (2), a door (3) for closing the wash tub (2), a hinge (16) by means of which the door (3) is pivotably attached to the wash tub (2) in order to move the door (3) from an open state (Z1) to a closed state (Z2) and vice versa, a pre-tensioning device (19) which spring-tensions the door (3) towards the closed state (Z2), and a purely mechanical locking device (22) which is designed to lock the door (3) in the event of damage to the pre-tensioning device (19) in order to prevent the door (3) from being moved automatically into the open state (Z2).