Razor Handle Dual-Ejector Mechanism for Cartridge Removal
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Solution Overview
Problem
Existing safety razor designs require excessive user force to remove razor cartridges due to increased frictional engagement caused by stresses in the connector mechanism, making cartridge replacement cumbersome.
Innovation Solution
A safety razor handle with a dual-ejector mechanism, where a first U-shaped ejector contacts the interior surface of the connector's remote portion and a second ejector contacts the opening portion of the recess, allowing for simultaneous or sequential pushing actions to disconnect the cartridge, reducing the required user force for removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single ejector acts on the remote end of the connector recess, then the connector can be pushed to disengage the snap fit, but the stresses caused increase frictional engagement at the entrance, requiring excessive user force
Solution Approach 1:
The ejector mechanism is divided into two separate ejectors: a first ejector that acts on the remote end of the recess and a second ejector that acts on the opening portion of the recess. This segmentation allows the ejection force to be distributed to multiple locations, preventing stress concentration that would increase frictional engagement, thereby reducing the user force required while maintaining effective cartridge removal
Solution Approach 2:
The ejection action is extended from a single-point force application at the remote end to a multi-point force application that includes both the remote end and the opening portion of the recess. This dimensional expansion of the ejection mechanism allows simultaneous force application at multiple locations along the connector, effectively overcoming the frictional engagement without requiring excessive user force
Data Source
AI summary
A safety razor has a handle and a razor cartridge having a handle and a connector. The connector includes a recess with an opening portion and a remote portion at an end of the recess opposed the opening portion. The handle includes a first ejector connected to a user-operable button and a distal end portion of the first ejector is adapted to contact an interior surface of the remote portion of the recess. The button also includes a second ejector structure adapted to contact the opening portion of the recess. When the button is operated, the combined function of the distal end portion of the first ejector contacting and pushing against a surface of the remote portion of the recess and the second ejector structure contacting and pushing against the opening portion of the recess act to disconnect the razor cartridge from the handle.