Razor Handle Plunger Guard Structure for Impact-Resistant Cartridge Support
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Solution Overview
Problem
Conventional razor handles with protruding plungers are prone to damage from external impacts, leading to improper support of the cartridge and rendering the razor unusable.
Innovation Solution
A handle assembly with a plunger guard structure that includes a first and second plunger guard, a plunger slidably coupled between them, and an elastic member to support the plunger, along with a cartridge design featuring a rotatable frame and plunger pressing protrusion with an asymmetrical taper shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plunger protrudes from the handle to support the cartridge, then the cartridge can be properly supported, but the plunger is prone to damage from external impact
Solution Approach 1:
The patent introduces guards that protrude from the handle to cover and protect the plunger before any damage can occur. These guards act as a preliminary protective barrier against external impacts, preventing the plunger from being directly exposed to harmful forces while maintaining its support function for the cartridge.
Solution Approach 2:
The guards serve as an intermediary element between the external environment and the plunger. Instead of allowing external impacts to directly affect the plunger, the guards intercept these forces first, thereby protecting the critical plunger component while still allowing the plunger to perform its cartridge support function.
2Reliability
If the plunger is protected by guards, then the plunger is less likely to be damaged, but the structure becomes more complex
Solution Approach 1:
The guards are integrated with the handle structure rather than being separate, independent components. This merging of the protective guards with the existing handle design adds protection functionality while minimizing the increase in overall structural complexity.
Solution Approach 2:
The guards serve multiple functions: they protect the plunger from external impacts, maintain the structural integrity of the handle, and do not interfere with the plunger's movement or cartridge support capability. This multi-functionality justifies the added structural elements.
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 protects the plunger from damage, allows easy attachment and detachment of the cartridge, and ensures safe, uniform shaving by maintaining the frame's position, enhancing the razor's usability and safety.
Implementation Method 1
an elastic member elastically supporting the plunger, and the plunger may be slid to the second position by an external force, and may return to the first position by the elastic force of the elastic member when an external force is removed
Data Source
AI summary
A cartridge may include at least one blade, and a frame supporting the at least one blade to expose the at least one blade at a front and configured to receive the at least one blade in a longitudinal direction. The cartridge may also include a first guard member disposed in front of the at least one blade and configured to align hair entering the at least one blade, and a second guard member disposed in front of the first guard member. The cartridge may further include an opening formed between the first and second guard members and configured to penetrate the frame in a direction from the front to a rear. A width of the opening in a lateral direction perpendicular to the longitudinal direction may be greater than a half of a width in a lateral direction defined by all of the at least one blade.