Knife Safety Device with Multi-Position Locking Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing knives lack a cost-effective and simple manufacturing solution for a safety mechanism that prevents accidental blade exposure and allows for easy blade replacement.
Innovation Solution
A knife design featuring a blade carrier movable between safety and cutting positions, with a safety device that includes an actuation mechanism with multiple positions to lock the handle and blade carrier, preventing unwanted movement and allowing for blade access by transitioning through specific locked positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety device with multiple locks is implemented to prevent accidental blade exposure, then user safety is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple locking functions into a single integrated safety device that includes both a first lock for the handle and a second lock for the blade carrier. This merging approach maintains comprehensive safety coverage while reducing the number of separate components and simplifying the overall structure compared to using entirely separate locking mechanisms.
Solution Approach 2:
The safety device is designed with multi-functionality, where a single actuation mechanism can engage or disengage both the first lock and the second lock depending on its position. This allows one component to perform multiple safety functions, reducing device complexity while maintaining reliable protection against accidental blade exposure.
2Reliability
If a complex safety mechanism with multiple locks is used, then user safety is improved, but manufacturing cost increases
Solution Approach 1:
By merging the first lock and second lock into a single integrated safety device with shared components such as the actuation mechanism and housing, the patent reduces the total number of parts that need to be manufactured and assembled. This consolidation lowers manufacturing costs while maintaining the dual-lock safety functionality.
Solution Approach 2:
The multi-functional safety device performs multiple locking operations through a single mechanism, reducing the need for multiple separate components. This decreases material usage, simplifies the manufacturing process, and reduces assembly steps, thereby lowering overall production costs while ensuring comprehensive safety protection.
3Ease of operation
If the blade carrier is always accessible for blade changes, then ease of operation is improved, but user safety deteriorates due to accidental exposure
Solution Approach 1:
The safety device acts as an intermediary between the user and the blade carrier. When the safety device is in the first position, the second lock engages to prevent access to the blade carrier, providing protection. When moved to the second position, the locks are disengaged, allowing controlled access for blade changes. This intermediary mechanism ensures that access is granted only when the user intentionally actuates the safety device.
Solution Approach 2:
Before allowing access to the blade carrier, the system requires preliminary action by the user to actuate the safety device from the first position to the second position. This preliminary action serves as a deliberate safety step that prevents accidental exposure while still enabling intentional blade changes when needed.
Data Source
Figure 1
Figure 2~4
Figure 5~7
AI summary
The invention relates to a knife having a blade carrier (18) on which a blade (13) is mounted, wherein the blade carrier (18) is mounted by a handle (12) so as to be movable between a safety position in which the blade (13) is arranged in the housing (11) and a cutting position in which the blade (13) protrudes from the housing (11). A blade change is possible if the housing (11) is arranged in an open position relative to the handle (12). The knife (10) comprises at least one safety device (S) by means of which a movement into the cutting position and/or the open position can be prevented. The invention is characterized in that the safety device (S) comprises an actuation element (15) that can be moved into at least one first position in which movement into the open position is locked and into a second position in which movement into the cutting position is locked.