Folding Knife Safety Switch Integration
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Solution Overview
Problem
Existing folding knives with safety devices, particularly liner lock folding knives, face installation difficulties due to independent spring components, leading to low stability and inconvenient operation, and the placement of the safety switch on the outer handle surface affects aesthetics and usability.
Innovation Solution
A folding knife design incorporating a switch lock sheet that integrates both switching and spring functions, eliminating the need for a separate spring component and positioning the safety switch internally within the handle, enhancing stability and ease of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an independent spring component is used in the safety device, then the switching function can be achieved, but the installation becomes difficult and stability decreases
Solution Approach 1:
The patent combines the spring component and switch component into a single integrated safety device assembly. The resilient member (spring) and the switch are merged into one unit that is collectively retained by the handle, eliminating the need for separate installation of independent spring and switch components. This integration directly resolves the installation difficulty while maintaining the switching function.
2Reliability
If the switch is provided at the middle position of the outer handle surface, then the safety function is achieved, but the operation convenience decreases and appearance is affected
Solution Approach 1:
The patent moves the switch from the outer surface of the handle (two-dimensional surface mounting) to the interior of the handle (three-dimensional spatial relocation). The switch is now positioned inside the handle body, accessible through an opening, which improves operational convenience by allowing thumb access without affecting the external appearance of the handle. The safety function is maintained through the internal positioning of the switch mechanism.
3Reliability
If the switch is provided at the middle position of the outer handle surface, then the safety function is achieved, but the appearance of the handle is affected
Solution Approach 1:
The switch is relocated from the external surface to the internal volume of the handle. This dimensional transition allows the switch mechanism to be hidden within the handle body, with only a small opening required for access. The external appearance of the handle remains smooth and aesthetically pleasing, while the safety function is preserved through the internal switch mechanism that can still detect blade position and engage the locking mechanism.
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
The integrated switch lock sheet simplifies installation, increases stability, and improves operational convenience while maintaining the handle's appearance by eliminating the need for an external spring and repositioning the switch internally.
Implementation Method 1
a resilient lock sheet (13) having one end fixed to the first liner plate (4) and the other end free to push the main knife (1) so as to lock the main knife (1)
Data Source
AI summary
Disclosed is a folding knife with safety device, which includes a main knife, a revolving shaft, a first liner plate, a first rivet, a switch lock sheet, a first handle part, a second handle part, a second liner plate and a spacer sleeve. The first liner plate is provided with a resilient lock sheet, an elongated slot, a stopper portion, a first rivet, a second rivet and a third rivet; the switch lock sheet is provided with a first rivet slot, a skidproof rack, a second rivet slot, a labor-saving slot, a locking contact, and a buckle; and the first handle part is provided with an axle hole, a holding slot, a holding hole and a screw hole. The present invention has advantages of simple structure, easy of use and stable performance.