Rotating Lock Cartridge Ejection for Shaver Safety
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Solution Overview
Problem
Existing shavers with interchangeable cartridges require users to manually push or pull the cartridge to remove and replace, increasing the risk of injury and necessitating the replacement of the entire shaver head when blades become worn, which is costly and inefficient.
Innovation Solution
A shaver design featuring a rotating lock mechanism that allows for the cartridge to be easily ejected without direct user contact, with a rotating lock that attaches and releases the cartridge from the shaver head, reducing the need for manual handling and enabling only the cartridge to be replaced, thus lowering costs and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual pushing or pulling is used to remove the cartridge, then the cartridge can be replaced, but the risk of user injury increases due to direct contact with blades
Solution Approach 1:
A push button mechanism serves as an intermediary tool to remove the cartridge without direct finger contact. The push button engages with the cartridge's ejection mechanism, allowing the cartridge to be expelled safely while eliminating the need for users to touch or grasp the blade-containing cartridge directly.
Solution Approach 2:
The cartridge removal system is designed to be self-operating through the push button mechanism. When the button is pressed, it automatically triggers the ejection springs to propel the cartridge outward, requiring no manual manipulation of the cartridge itself by the user.
2Reliability
If the entire shaver head is replaced when blades become worn, then reliability is maintained, but manufacturing costs and waste increase
Solution Approach 1:
The shaver system is divided into separate functional modules: a reusable shaver head housing and a replaceable cartridge containing the blades. This segmentation allows only the worn cartridge to be replaced while the head is retained, reducing material waste and manufacturing costs while maintaining reliable shaving performance through consistent head construction.
Solution Approach 2:
The design enables selective discarding of only the consumable cartridge component when blades wear out, while recovering and reusing the durable shaver head assembly. This extends the lifecycle of the head components and reduces overall waste and manufacturing resource consumption.
3Ease of operation
If a rotating lock mechanism is implemented, then cartridge ejection is simplified and safety is improved, but device complexity increases
Solution Approach 1:
The lock mechanism transitions from a static locked state to a dynamic ejection state through the push button action. The rotating elements and spring-loaded components create a controlled dynamic sequence that simplifies the user interaction while managing the mechanical complexity through predictable motion patterns.
Solution Approach 2:
The ejection mechanism uses periodic spring action to propel the cartridge outward at specific moments. The ejection springs are compressed during normal operation and then released in a controlled periodic manner when the push button is activated, creating a reliable ejection cycle that manages complexity through repetitive mechanical action.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~4c
AI summary
Shaver comprising a handle with an elongated handgrip portion and a mounting portion, a shaver head attached to the mounting portion. A removable cartridge is attached to the shaver head through the rotating lock thereof. The rotating lock is adapted to rotate about an axis parallel to the length of the blades of the cartridge, thus defining a neutral position and a rotated position. The rotating lock in the neutral position attaches the cartridge to the shaver head, and the rotating lock in the rotated position releases the cartridge from the shaver head.