Trimmer Cutting Assembly with Enlarged Tooth Tips
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Solution Overview
Problem
The thickness of the guard plate in reciprocating trimmers limits the closeness of the cut, but making it thinner compromises its stiffness and robustness, potentially causing damage during cutting.
Innovation Solution
The cutting teeth of the cutter plate are designed with outwardly enlarged tips that maintain overlap with guard teeth, providing additional mechanical rigidity to support the guard plate, allowing it to be made thinner while maintaining cutting efficiency and reducing deformation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the guard plate is made thinner to achieve a closer cut, then the closeness of the cut is improved, but the stiffness and robustness of the guard plate deteriorates
Solution Approach 1:
The patent combines the guard plate and cutter plate into a single integrated component where the cutter plate's teeth are formed directly on the guard plate structure. This merging allows the thinner guard plate to maintain structural integrity while achieving closer cuts, as the integrated design distributes mechanical loads more effectively across the combined structure.
Solution Approach 2:
The patent employs a composite structure where the guard plate and cutter plate are made from different materials with complementary properties. The guard plate portion is optimized for stiffness and strength, while the cutter plate portion is designed for cutting performance. This material differentiation allows the thin guard plate to maintain robustness without compromising the closeness of the cut.
2Manufacturing precision
If the guard plate is made thinner to achieve a closer cut, then the closeness of the cut is improved, but the ability to withstand cutting forces deteriorates
Solution Approach 1:
By merging the guard plate and cutter plate into an integrated component, the patent creates a unified structure that better resists cutting forces. The combined design allows force distribution across the entire assembly rather than concentrating stress on the thin guard plate alone, enabling it to withstand cutting forces while maintaining thickness reduction for closer cuts.
Solution Approach 2:
The patent addresses the force resistance issue by transitioning from a two-plate design to an integrated three-dimensional structure. The cutter plate teeth are formed as an extension of the guard plate, creating a multi-dimensional load path that distributes cutting forces throughout the entire component rather than along a single thin plate, thereby maintaining force resistance despite reduced thickness.
3Manufacturing precision
If the guard plate is made thinner to achieve a closer cut, then the closeness of the cut is improved, but the risk of deformation increases
Solution Approach 1:
The integrated design merges the guard plate and cutter plate into a single rigid structure that resists deformation. By eliminating the interface between two separate plates, the design removes a potential weak point where deformation could occur, allowing the thinner guard plate to maintain stability and resist deformation while enabling closer cuts.
Solution Approach 2:
The patent uses composite material properties where the guard plate portion is engineered for dimensional stability and resistance to deformation, while the cutter plate portion provides cutting functionality. This material differentiation allows the thin guard plate to maintain its shape and resist deformation under cutting loads, ensuring manufacturing precision is maintained.
Data Source
AI summary
Provided is a cutting assembly (100) for cutting hairs on skin. The cutting assembly comprises a guard plate (102) for contacting the skin. The guard plate has a first toothed edge (104A) which extends along an axis. The first toothed edge comprises guard teeth (106A). The cutting assembly further comprises a cutter plate (108) which is disposed on the guard plate. The cutter plate is slidable relative to the guard plate in directions parallel with the axis. The cutter plate comprises a second toothed edge (110A) extending parallel with the axis. The second toothed edge comprises cutting teeth (112A). The cutter plate and the guard plate are aligned such that the hairs are cut by the cutting teeth against the guard teeth when the cutter plate slides. The cutting teeth each include a cutting portion (114A) and a tip (116A). The tip is outwardly enlarged relative to the cutting portion in at least one direction parallel with the axis. The minimum space between adjacent tips is less than the minimum space between adjacent guard teeth. The tip thereby maintains overlap with at least one of the guard teeth during sliding of the cutter plate relative to the guard plate. Further provided is a trimmer including the cutting assembly.