Quick-Lock Squeegee Coupling for Impact-Resistant Floor Scrubbers
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Solution Overview
Problem
Prior squeegee assemblies in surface maintenance vehicles are vulnerable to damage from stationary objects due to exposed ends, leading to costly repairs and potential operator injury, and existing coupling mechanisms are difficult to work with in dirty environments.
Innovation Solution
A mechanical coupling system with a resilient compliant bushing and a non-deformable central sleeve, designed to absorb stress and disconnect from the vehicle at a predetermined threshold force, featuring a biasing structure and over-center levers for easy mounting and dismounting, allowing the squeegee assembly to articulate and maintain contact with the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the squeegee assembly is made wide to cover the path width of scrub brushes and wheels, then cleaning effectiveness is improved, but vulnerability to damage from stationary objects increases
Solution Approach 1:
The squeegee assembly is designed with dynamic characteristics that allow it to articulate and pivot when encountering stationary objects, transforming rigid vulnerable ends into flexible protective elements. The assembly can dynamically adjust its position and orientation to avoid damage while maintaining cleaning coverage.
Solution Approach 2:
The coupling mechanism incorporates cushioning elements and stress-absorbing features that prepare the assembly for potential impacts with stationary objects. The design anticipates possible collisions and built-in protective mechanisms that prevent damage before it occurs.
2Strength
If threaded fasteners are used to secure the squeegee assembly, then connection strength is improved, but ease of operation deteriorates due to difficulty working with threads in dirty environments
Solution Approach 1:
The patent extracts the threaded fastener mechanism from the coupling system and replaces it with a simplified attachment method. The coupling mechanism uses stress-absorbing elements and geometric interlocking features that eliminate the need for threading operations, making attachment much easier in dirty environments.
Solution Approach 2:
The coupling mechanism employs simple, easily replaceable components that can be quickly attached and detached without complex fastening operations. The design prioritizes ease of operation over permanent durability, allowing rapid replacement of wear items.
3Strength
If a rigid coupling is used to secure the squeegee assembly, then connection strength is improved, but adaptability deteriorates because the assembly cannot articulate or float
Solution Approach 1:
The coupling mechanism changes the mechanical parameters of the connection from rigid to semi-flexible, allowing articulation and floating motion while maintaining sufficient connection strength. The stress-absorbing elements provide controlled flexibility that enables adaptation to surface variations and obstacles.
Solution Approach 2:
The coupling system uses composite construction combining rigid structural elements with flexible stress-absorbing components. This creates a hybrid connection that provides both strength and articulation capability, merging properties of rigid and flexible materials.
4Ease of operation
If the squeegee assembly is designed to be easily removable, then ease of operation is improved, but connection strength deteriorates making it vulnerable to normal operational forces
Solution Approach 1:
The coupling mechanism uses dynamic characteristics with stress-absorbing elements that allow easy removal under normal conditions while maintaining strong connection during operation. The system transitions between coupled and uncoupled states based on applied forces.
Solution Approach 2:
The design incorporates pre-engineered stress-absorbing features and controlled release mechanisms that allow easy removal when needed while preventing accidental detachment during normal use. The cushioning elements provide a safety margin that maintains connection strength.
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 squeegee assembly that can absorb and manage stress forces, preventing damage to the assembly and vehicle, while maintaining effective contact with the surface during operation, and simplifies the attachment process by reducing the need for complex threaded fasteners.
Implementation Method 1
a resilient compliant bushing... designed to absorb stress
Data Source
AI summary
A releasable squeegee assembly for coupling to a surface maintenance machine and including a compliant bushing and an over-center lever attached to a pull rod and compliant spring. The compliant bushing is compressed via said over-center lever with said compliant spring providing a spring force. A bushing sleeve is provided to limit the degree of compression of said compliant bushing by the over-center lever. A method of coupling a squeegee assembly to a surface maintenance machine is also provided.