Rolling Plate Assembly for Portable Power Cutting Tools
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Solution Overview
Problem
Conventional portable power cutting tools face issues with friction and accuracy during operation, leading to increased user effort and the risk of kick-back due to unstable attachment plates, which can cause injuries.
Innovation Solution
A rolling plate assembly with injection molded fiber enriched plastic, featuring removable wheels and an improved structural design with increased traction and stability, reduces friction and kick-back by allowing smooth rolling motion and straight cuts, while also enabling quick attachment and replacement of wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional flat plate is attached to the bottom of the circular saw, then the saw can be supported during cutting operation, but extra effort is required from the user to overcome friction between the plate and workpiece
Solution Approach 1:
The patent replaces the conventional flat plate with rolling elements (wheels or ball bearings) that convert sliding friction into rolling friction. The circular geometry of these rolling elements allows them to rotate freely between the saw plate and workpiece surface, dramatically reducing the frictional resistance and making the saw easier to push during cutting operations.
Solution Approach 2:
The patent introduces rolling elements as an intermediary component between the saw plate and the workpiece. These elements mediate the contact interaction by providing a low-friction interface that reduces the direct frictional force between the metal plate and workpiece surface, thereby reducing the effort required by the user.
2Manufacturing precision
If a heavy attachment plate is used, then the saw has stability during cutting, but the plate tends to slide in side-to-side motion which reduces cutting accuracy
Solution Approach 1:
The rolling elements provide a stable yet low-friction interface that prevents side-to-side sliding motion. The circular geometry naturally resists lateral movement while allowing forward rolling, maintaining the saw's stability in the cutting direction without the side-to-side instability that plagues heavy flat plates.
Solution Approach 2:
The patent changes the friction parameter by transitioning from high sliding friction to low rolling friction. This parameter change allows the attachment to maintain stability through the rolling mechanism while significantly reducing the side-to-side sliding that compromises cutting accuracy.
3Ease of operation
If the flat attachment plate has unstable frictional binding with the workpiece, then the saw blade may veer off a straight line, but this can cause the blade to bind and kick back against the worker
Solution Approach 1:
The rolling elements provide consistent, controlled contact with the workpiece surface through their circular geometry. This controlled rolling contact prevents the unstable frictional binding that causes blade veering and subsequent kick-back, while maintaining smooth operation and blade control throughout the cutting process.
Solution Approach 2:
The patent converts the potentially harmful unstable frictional binding into a beneficial controlled rolling contact. By transforming the friction mechanism from sliding to rolling, the system eliminates the kick-back hazard while maintaining adequate traction for controlled operation.
4Weight of moving object
If a conventional flat plate is used, then the structure is simple, but the plate is heavy and requires significant material
Solution Approach 1:
The patent segments the attachment plate into multiple components: a base plate and separate rolling elements (wheels or ball bearings). This segmentation allows the use of lighter materials and reduces the overall weight while maintaining structural integrity. The rolling elements can be independently selected and replaced without replacing the entire attachment assembly.
Solution Approach 2:
The patent employs composite construction by combining the base plate material with rolling element materials (such as polyurethane wheels or steel ball bearings). This composite approach allows optimization of each component for its specific function while reducing overall weight compared to a solid metal plate of equivalent 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 significantly reduces user effort, improves cutting accuracy, and minimizes the risk of kick-back by providing enhanced traction and stability, allowing for safer and more efficient operation of portable power cutting tools.
Implementation Method 1
injection molded fiber enriched plastic which facilitates strong weight and torsional stress memory
Implementation Method 2
facilitates the ease and safety of handling the portable power cutting tool during the operation of the tool
Data Source
AI summary
The present invention is an attachable rolling plate assembly which can be attached as a single unit to a portable cutting tool to facilitate the safe rolling movement of the portable cutting tool on the workpiece. The invention comprises a frame assembly formed from a single piece of molded material such as fiber enriched plastic having a pair of oppositely disposed longitudinal sidewalls with stabilizer ribs extending therefrom, and a flat base portion having and opening through which a saw of a power saw extends. The plate has front and rear fastening members to retain a plate of a power cutting saw onto the rolling plate assembly. The invention also includes a cutting guide assembly to facilitate a straight cut, reduce torsional rotation of the saw blade and reduce kickback of the saw.