Spray Arm Assembly for In-Drum Stain Pre-Treatment in Washing Machines
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Solution Overview
Problem
Conventional laundry treating appliances often fail to completely remove stubborn stains during the wash cycle, necessitating manual pre-treatment by users.
Innovation Solution
The design incorporates a spray arm assembly with a scrub surface and a movable basin, allowing for targeted liquid application and scrubbing within the washing machine, enabling effective pre-treatment of stains without the need for an external sink or additional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional washing cycles are used, then the washing machine operates with standard pre-programmed cycles, but stubborn stains cannot be completely removed
Solution Approach 1:
The spray arm assembly enables preliminary action by allowing users to apply liquid detergent directly to stains and scrub them before the main wash cycle. The basin holds the laundry item in place while the spray arm delivers targeted treatment, performing the pre-treatment step within the washing machine itself rather than requiring separate manual preparation outside the appliance.
2Adaptability or versatility
If a spray arm assembly with basin is added, then pre-treatment functionality is integrated into the washing machine, but the device complexity increases
Solution Approach 1:
The spray arm assembly integrates multiple functions into a single device: the basin serves as both a container for holding laundry items and a workspace for pre-treatment, while the spray arm combines liquid delivery and scrubbing functions. This multi-functionality adds versatility without proportionally increasing overall system complexity, as components serve multiple purposes within the pre-treatment process.
Solution Approach 2:
The spray arm is designed to be movable rather than fixed, allowing it to be positioned over the basin when pre-treatment is needed and retracted or moved away when not in use. This dynamic positioning enables the spray arm to access different areas and facilitates easy cleaning and maintenance, managing the complexity of the added functionality through flexible, adjustable design.
3Adaptability or versatility
If manual pre-treatment is performed outside the washing machine, then stains can be treated, but additional space and external equipment are required
Solution Approach 1:
The spray arm assembly and basin are nested within the existing washing machine structure. The basin fits inside the washing chamber, and the spray arm is positioned to operate over the basin without extending beyond the appliance's external dimensions. This nesting approach integrates pre-treatment functionality into the existing volume of the washing machine, avoiding the need for additional external space or equipment.
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
This solution enhances stain removal efficiency by providing a built-in pre-treatment mechanism that combines water and treating chemistry application with scrubbing action, reducing the need for manual pre-treatment and optimizing space within the appliance.
Implementation Method 1
a spray arm assembly having a spray head and a faucet, with the spray head overlying the access opening when the cover is closed to spray liquid into the treating chamber
Implementation Method 2
a spray arm assembly having a spray head including a scrub surface
Data Source
AI summary
A laundry treating appliance includes a chassis defining an interior. A rotatable treating chamber is located within the interior and has an access opening. A cover is movably mounted to the chassis for selective movement between opened and closed positions to open and close the access opening. The laundry treating appliance further comprises a spray arm assembly having a spray head.