Dishwasher Lower Rack Unlocking Lever for Easy Return
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Solution Overview
Problem
Existing dishwasher rack elevation mechanisms require users to perform complex horizontal movements to unlock and return the elevated lower rack to its lower position, causing discomfort and potential damage to goods, especially for disabled or elderly users.
Innovation Solution
A mechanism featuring a lever extending from the front of the elevated lower rack that acts on a locking mechanism to unlock the spring-loaded pivot arm arrangement, allowing the rack to be easily lowered back into the dishwasher tub, eliminating the need for horizontal displacement and reducing the risk of goods being damaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user pushes the elevated lower rack horizontally along the sliding rail to unlock it, then the locking mechanism will release, but the user must perform complex horizontal movements which causes discomfort and potential damage to goods
Solution Approach 1:
A lever is introduced as an intermediary element between the user and the locking mechanism. The lever extends from the front of the rack to the locking mechanism, allowing the user to operate the lock by simply pushing or pulling the lever at the front, rather than manually pushing the entire rack horizontally. This intermediary lever transmits the user's force to the locking mechanism, simplifying the operation while maintaining reliable locking.
Solution Approach 2:
Instead of requiring the user to push the rack horizontally to unlock it (the conventional approach), the invention inverts the operation by having the locking mechanism itself move or release in response to lever operation. The lever's movement at the front of the rack triggers the unlocking action, reversing the traditional sequence where rack movement causes lock release.
2Ease of operation
If the rack elevation arrangement uses spring loaded pivot arms to elevate the lower rack, then the rack can be easily elevated to an upper position, but the user must still perform complex horizontal movements to return it to the lower position
Solution Approach 1:
The lever for unlocking is merged with the existing rack structure, extending from the front of the rack along its side to the locking mechanism. This integration means the unlocking function is built into the rack itself rather than being a separate, complex external mechanism. The lever utilizes the rack's own structural elements, combining the elevation and unlocking functions into a unified, simpler system.
3Reliability
If the locking mechanism is located at the back of the rack, then it can effectively secure the elevated position, but the user cannot easily access it to unlock the rack
Solution Approach 1:
The lever creates a new dimensional approach to accessing the locking mechanism. Instead of requiring the user to reach the back of the rack (one-dimensional access problem), the lever extends the operational interface from the front of the rack to the locking mechanism, creating a leveraged mechanical advantage that spans the length of the rack. This transforms the accessibility issue into a moment arm problem, where force applied at one end (front) produces the required action at the other end (locking mechanism).
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
Provides an intuitive and straightforward method for users to unlock and return the elevated lower rack, facilitating easier operation and reducing the risk of goods being damaged, especially when handling heavily loaded or tall items.
Implementation Method 1
The elevating arrangement comprises a spring loaded pivot arm arrangement to be attached in one end to a tub of the dishwasher and in another end to the lower rack for elevating the lower rack from the lower position inside the tub to the upper position at least partially outside the tub
Data Source
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AI summary
The invention relates to a mechanism for unlocking an elevated lower rack in a dishwasher. The mechanism for unlocking an elevated lower rack is provided in an arrangement for a dishwasher (10) being capable of elevating the lower rack (11) from a lower position to an upper position and locking the elevated lower rack in the upper position. The elevating arrangement comprises a spring loaded pivot arm arrangement (12) to be attached in one end to a tub (13) of the dishwasher and in another end to the lower rack (11) for elevating the lower rack (11) from the lower position inside the tub to the upper position at least partially outside the tub. The elevating arrangement further comprises a locking mechanism (21) arranged between the spring loaded pivot arm arrangement (12) and the lower rack (11) and configured to lock the spring loaded pivot arm arrangement when the lower rack has been elevated to the upper position, thereby fixing the lower rack in the upper position. The mechanism for unlocking the elevated lower rack (11) is characterized in comprising a lever (20) extending from a front of the lower rack (11) along each side of the lower rack to the locking mechanism (21) being located at a respective side of the rack (11), wherein user operation of the lever (20) at the front of the elevated lower rack causes a respective end of the lever to act on the locking mechanism (21) located at the respective side of the rack to unlock the elevated lower rack (11) such that it can be lowered into its lower position.