Internal-Spring Flat Box Finisher for Tight Drywall Joints
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Solution Overview
Problem
Existing flat box finishers for applying mud or mastic to drywall joints lack an internal support bar that acts as a spring, making them bulky and prone to spring damage, and fail to provide a cost-effective solution for smaller or hard-to-reach areas.
Innovation Solution
A flat box finisher with an internal support bar that acts as a spring, eliminating the need for external springs, allowing for a reduced size and improved durability, featuring a movable top plate, trowelling bar with slits for flexibility, and a rolling bar for smooth surface navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external springs are used to apply pressure to the handle, then the device can maintain consistent contact with the surface, but the device size increases and the springs can wear out or become damaged
Solution Approach 1:
The patent removes the external springs from the device entirely, extracting the problematic component that caused both the size increase and reliability issues. The spring function is replaced by an alternative mechanism using the device's own structural components.
Solution Approach 2:
The device uses its own structural components (the bottom surface and handle connector portion) to provide the spring function, rather than relying on separate external springs. The device serves itself by utilizing its inherent flexibility and geometry to maintain contact pressure.
2Ease of operation
If external springs are used to apply pressure to the handle, then the device can maintain consistent contact with the surface, but the top surface area must be increased to accommodate the springs
Solution Approach 1:
The patent removes the external springs from the device entirely, extracting the problematic component that caused both the size increase and reliability issues. The spring function is replaced by an alternative mechanism using the device's own structural components.
Solution Approach 2:
The patent utilizes the flexible bottom surface and handle connector portion to provide the spring function. These flexible components can deform and recover, maintaining consistent contact pressure without requiring rigid external springs or increased surface area.
3Area of stationary object
If the device size is reduced for smaller jobs, then the device becomes more suitable for limited areas, but external springs become more prone to damage
Solution Approach 1:
The patent removes the external springs from the device entirely, extracting the problematic component that caused both the size increase and reliability issues. The spring function is replaced by an alternative mechanism using the device's own structural components.
Solution Approach 2:
The patent merges the spring function with the device's structural components (bottom surface and handle connector). By combining these functions into a single integrated structure, the device eliminates the need for separate springs that could become damaged during use or storage.
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 provides a lightweight, cost-effective, and efficient tool for applying mud to drywall joints, reducing the risk of spring damage and enabling easy access to smaller areas while maintaining effective mud application and smoothing.
Implementation Method 1
at least one internal support bar which acts as a spring for applying pressure to a corresponding dry wall finishing handle
Data Source
AI summary
The invention generally relates to a flat box finisher for applying mud (or mastic or joint compound) over taped joints on walls and ceilings. Usually, paint or wallpaper is then applied over the finished mud. The flat box finisher has no external springs, but has at least one internal support bar which acts as a spring for applying pressure to a corresponding dry wall finishing handle affixed to the flat box finisher. The internal support bar is surrounded by the mud while the device is in use. As a result of having no external spring, the flat box finisher may be reduced in size for smaller jobs or difficult to reach areas of a room. The internal support bar may also eliminate problems with external springs, such as the spring wearing out or becoming damaged during use or storage.