Pivoting Razor Cartridge Coupling to Prevent Handle Separation
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Solution Overview
Problem
Razor handle and cartridge separation during use due to external forces, leading to incorrect assembly and potential injury, and the difficulty in maintaining the correct orientation of the razor blade for effective shaving.
Innovation Solution
A razor assembly design with a razor handle pivotably coupled to a cartridge, featuring a separation preventing protrusion and a connecting arm system that ensures proper alignment and prevents unintended separation, using elastic return force to maintain the correct orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the razor handle and razor cartridge are made separable for modular design, then ease of replacement is improved, but reliability deteriorates due to unintended separation during use
Solution Approach 1:
The coupling structure employs asymmetric geometry where the connecting arm has a specific shape that only fits into the handle coupling part in one orientation. The protrusion on the connecting arm corresponds to a recess in the handle coupling part, creating a non-reversible connection that prevents both unintended separation and incorrect assembly while maintaining modular replaceability
2Ease of operation
If the razor cartridge can be coupled in any direction, then ease of operation is improved, but manufacturing precision deteriorates due to incorrect blade orientation
Solution Approach 1:
The coupling interface uses asymmetric features including a protrusion on the connecting arm that fits into a corresponding recess in the handle coupling part. This asymmetric design allows the cartridge to be easily coupled in the correct orientation while physically preventing coupling in incorrect orientations, thereby ensuring proper blade orientation without compromising ease of operation
3Adaptability or versatility
If the connecting arm is allowed to move freely under external force, then adaptability is improved, but stability deteriorates due to separation under impact
Solution Approach 1:
The coupling structure incorporates preliminary anti-action by designing the protrusion and recess to engage in a way that preemptively counteracts separation forces. The geometric interlocking creates mechanical resistance to external forces before they can cause separation, while still allowing controlled movement during normal shaving operations
Data Source
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AI summary
Disclosed is a razor assembly including a razor cartridge including at least one razor blade, and a razor handle pivotably coupled to the razor cartridge. The razor cartridge may include: a blade housing accommodating the razor blade so that at least a portion of a cutting edge of the at least one razor blade is exposed toward a front side and a handle coupling part provided on one side of the blade housing and pivotably coupled to the razor handle. The handle coupling part comprises a separation preventing protrusion protruding to prevent the razor handle from being separated from the handle coupling part. The razor handle include a connecting arm that moves along one surface of the handle coupling part. The connecting arm positions the separation preventing protrusion inside of an inner wall of the connecting arm while the connecting arm is moved along the one surface of the handle coupling part. The connecting arm includes an accommodating groove recessed from the inner wall to receive the separation preventing protrusion when the connecting arm is coupled to the handle coupling part.