Reciprocating Shaver Slit Blade Lateral Retention Mechanism
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Solution Overview
Problem
Conventional reciprocation type electric shavers face issues with the slit blade disengaging from the outside blade holder when floated with inclination, leading to reduced displacement and worsened contact feeling on the skin, and require larger dimensions to prevent disengagement.
Innovation Solution
A reciprocation type electric shaver with a coupling structure that retains the slit blade laterally, preventing disengagement even when inclined, allowing for increased displacement and improved contact feeling, while downsizing the blade and holder dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hooking dimension of the hooking piece in the longitudinal direction is enlarged to prevent disengagement of the slit blade from the outside blade holder, then the reliability of blade retention is improved, but the outside blade holder becomes larger and the contact feeling to skin deteriorates
Solution Approach 1:
The patent introduces lateral retention through the hooking piece engaging with the hooking groove in the lateral direction, adding a new dimension to the retention mechanism. This allows the longitudinal dimension to be reduced while maintaining reliability through combined longitudinal and lateral retention constraints.
Solution Approach 2:
The retention function is segmented into two independent components: longitudinal retention through the hooking groove and lateral retention through the hooking piece engagement. This segmentation allows each component to be optimized independently, reducing the overall size while maintaining reliability.
2Reliability
If the displacement of the slit blade in floating motion is reduced to prevent disengagement, then the reliability of blade retention is improved, but the contact feeling to the skin deteriorates
Solution Approach 1:
The patent adds lateral retention through the hooking piece and hooking groove engagement, which prevents disengagement without restricting the longitudinal floating displacement. This allows the blade to maintain its displacement range for good skin contact while being retained through the new lateral constraint dimension.
3Reliability
If the hooking groove depth is increased to prevent disengagement of the slit blade, then the reliability of blade retention is improved, but the outside blade holder becomes larger and the following characteristic to skin deteriorates
Solution Approach 1:
The patent introduces lateral retention through the hooking piece engaging with the hooking groove in the lateral direction, adding a new dimension to the retention mechanism. This allows the longitudinal depth of the hooking groove to be reduced while maintaining reliability through combined longitudinal and lateral retention constraints.
Solution Approach 2:
The retention function is segmented into two independent components: longitudinal retention through the hooking groove depth and lateral retention through the hooking piece engagement. This segmentation allows the groove depth to be reduced while maintaining reliability through the lateral component.
Data Source
AI summary
In a reciprocation type electric shaver having an outside blade unit detachable from a main body, the outside blade unit comprises a main blade, a slit blade and an outside blade holder for holding the main blade and the slit blade capable of floating up and down. A coupling structure for coupling the slit blade on the outside blade holder has a retaining structure for engaging the slit blade and the outside blade holder in a lateral direction of the outside blade unit so as to prevent disengagement of the slit blade from the outside blade holder when the slit blade is floated up and down with inclination. The retaining structure is a pair of fitting recesses formed on the slit blade and a pair of fitting protrusions formed on the outside blade holder.