Reciprocating Shaver Inner Blade Elastic Projection Assembly
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Solution Overview
Problem
Reciprocating-type electric shavers face inefficiencies in production due to increased processes and costs, particularly in assembling the inner blade to the inner blade base, where the inner blade's sharp edge encroaches on the oblique guide surface, preventing proper assembly and leading to potential defects and downtime.
Innovation Solution
The inner blade features an attachment groove with an engagement groove on its side edge, allowing an elastically deformable projection on the inner blade base to engage with the engagement claw, eliminating the need for folding processes and ensuring reliable assembly by preventing encroachment during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a supplementary claw with an oblique guide surface is used to engage with the inner blade, then the number of assembly processes is reduced, but the sharp edge of the inner blade encroaches on the oblique guide surface preventing proper assembly
Solution Approach 1:
The patent changes the geometric parameters of the engagement interface by replacing the oblique guide surface with a guide surface having a specific angle range (10-45 degrees) and defining precise dimensional relationships between the guide surface, engagement groove, and claw. This parameter optimization allows the sharp-edged inner blade to pass through without encroachment while maintaining assembly efficiency.
Solution Approach 2:
The patent introduces a projection with a guide surface as an intermediary element between the inner blade and the supplementary claw. This intermediary structure mediates the interaction by providing a controlled engagement path that prevents the inner blade's sharp edge from interfering with the assembly process, while still enabling the claw to engage properly with the engagement groove.
2Reliability
If the engagement claw is folded with respect to the retaining recess to form the inner blade unit, then the inner blade can be fixed to the inner blade base, but the number of processes increases and production efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-forming the engagement groove and guide surface on the inner blade, and pre-configuring the projection and engagement claw on the inner blade base. These preliminary preparations enable the components to self-align and engage automatically during assembly, eliminating the need for subsequent folding operations while ensuring reliable fixation.
Solution Approach 2:
The patent segments the fixing mechanism into distinct functional elements: the engagement groove on the inner blade, the projection with guide surface on the inner blade base, and the engagement claw. This segmentation allows each element to perform its specific function independently, enabling a simpler assembly process where components are joined through direct engagement rather than folding operations.
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
This configuration reduces the number of assembly processes, enhances production efficiency, decreases costs, and prevents defective products and downtime by ensuring smooth assembly without encroachment issues, thus improving overall production reliability.
Implementation Method 1
the projection can be elastically deformed in the in-plane direction on the wall surface of the side edge and in the longitudinal direction of the inner blade
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In a reciprocating-type electric shaver 1 in which an inner blade 42 supported by an inner blade base 43 and having an inverted U-shape in a cross-sectional view slides and reciprocates on an inner surface of an outer blade 22, the inner blade 42 has an attachment groove 52 which is open downward in a lower end of a side edge 50. An inner peripheral portion of the attachment groove 52 has an engagement groove 54 which is recessed in an in-plane direction on a wall surface of the side edge 50 and in a longitudinal direction of the inner blade 42. The inner blade base 43 has a projection 55 at a position corresponding to the attachment groove 52 of the inner blade 42. The projection 55 can be elastically deformed in the in-plane direction on the wall surface of the side edge 50 and in the longitudinal direction of the inner blade 42, and is formed so that an engagement claw 56 disposed in a distal end of the projection 55 can enter and engage with the engagement groove 54. The engagement claw 56 engages with the engagement groove 54, thereby causing the inner blade 42 to be fixed to the inner blade base 43.