Back Shaver Cutter Head with Elastic Counterbalance
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Solution Overview
Problem
Existing back shavers are complex in structure, inconvenient to operate, and provide a poor shaving experience due to uneven force distribution between the handle and cutter head assembly, leading to either excessive or insufficient contact with the skin.
Innovation Solution
A back shaver design featuring a cutter head assembly with a rotating shaft, elastic components, and arc-shaped sliding blocks that generate a counter force moment to balance the applied force, allowing the cutter head to gently rotate and closely contact the skin for effective hair removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If excessive force is applied to the handle, then the cutter head assembly generates excessive force moment, but the cutting edge surface applies overweight load on human skins
Solution Approach 1:
The patent introduces a balancing mechanism with elastic components that generate a counter force moment to offset the excessive force moment from handle operation. This counterbalancing action reduces the net force transmitted to the cutter head, preventing overweight load on the skin while maintaining effective shaving force.
Solution Approach 2:
The patent employs elastic components that provide dynamic force adjustment based on the operating conditions. The elastic deformation of these components creates a variable counter force that adapts to the applied handle force, enabling the system to maintain optimal cutting force while preventing skin overload.
2Force
If small force is applied to the handle, then the cutter head assembly generates small force moment, but the cutting edge surface is slightly in contact with human skins resulting in poor shaving
Solution Approach 1:
The balancing mechanism with elastic components generates a counter force moment that, when combined with the small applied force, optimizes the net force transmitted to the cutter head. This ensures sufficient contact force between the cutting edge and skin for effective shaving, even when the user applies minimal handle force.
Solution Approach 2:
The elastic components automatically adjust the force transmission based on the handle input, providing force amplification or optimization without requiring additional user effort. The system self-regulates to maintain optimal cutting conditions across different operating forces.
3Stability of the object's composition
If a mechanism is disposed on the cutter head assembly to generate counter force moment, then balance is achieved with the force moment, but the structure becomes complex
Solution Approach 1:
The elastic components serve multiple functions: they provide the counter force moment for balancing, act as force transmission elements, and function as mechanical springs for energy storage and release. This multi-functionality reduces the need for separate balancing mechanisms, simplifying the overall structure.
Solution Approach 2:
The use of elastic components (such as elastic sheets or flexible elements) provides the necessary counter force through elastic deformation rather than rigid mechanical linkages. This flexible approach reduces structural complexity compared to traditional rigid balancing mechanisms while achieving the required force equilibrium.
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 design ensures a comfortable and efficient shaving experience by maintaining consistent contact between the cutter head and skin, improving the operational simplicity and effectiveness of the shaver.
Implementation Method 1
Elastic components are disposed on one side, distal from the handle, of the connecting member. When the handle is operated, a first force moment is applied to the cutter head frame through the connecting member, and a free end of each of the elastic components slides along a first end of a corresponding one of the sliding blocks to a second end of the corresponding one of the sliding blocks to generate a second force moment against the first force moment
Data Source
AI summary
A back shaver includes a cutter head assembly and a handle. The handle is connected to the cutter head assembly. The cutter head assembly includes cutter heads, a cutter head frame, and a connecting member. The cutter heads are embedded in a front surface of the cutter head frame. A back surface of the cutter head frame is connected to the connecting member through a rotating shaft. Elastic components are disposed on one side, distal from the handle, of the connecting member. Sliding blocks are disposed on the back surface of the cutter head frame. When the handle is operated, a first force moment is applied to the cutter head frame through the connecting member, and a free end of each of the elastic components slides along a first end of a corresponding one of the sliding blocks to a second end of the corresponding one of the sliding blocks.