Trigger Knife Gear Rack Transmission Mechanism
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Solution Overview
Problem
Existing trigger knives require excessive force to extend the blade due to leverage mechanisms or require greater horizontal displacement, limiting their usability and user experience.
Innovation Solution
A trigger knife design incorporating a transmission mechanism with gear racks and gears, allowing rotational movement of the trigger to be converted into linear movement of the blade, along with a blocking piece and stepped groove for adjustable blade extension, reducing the force required and enabling longer blade extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a leverage mechanism is used to drive the blade out, then the blade can be extended, but more force is required to drive the trigger
Solution Approach 1:
The patent replaces the traditional leverage mechanism with a rack and pinion gear system. The trigger is connected to a pinion gear that meshes with a rack on the blade assembly. This gear mechanism converts rotational trigger movement into linear blade extension, providing mechanical advantage through gear ratios rather than direct leverage, thereby reducing the force required while maintaining extension capability
Solution Approach 2:
The patent changes the mechanical transmission parameters by introducing gear teeth engagement. The pinion gear with a specific number of teeth meshing with the rack creates a determined gear ratio that transforms the input force and displacement characteristics. This parameter change allows for optimized force reduction while achieving the required blade extension distance
2Length of moving object
If the trigger is driven by a short distance, then the structure is compact, but the blade extension distance is limited
Solution Approach 1:
The gear mechanism acts as a motion amplifier. A small rotational displacement of the pinion gear on the trigger translates into a larger linear displacement of the rack and blade assembly. This substitution of direct linear leverage with rotational gear transmission enables the trigger to be pressed a short distance while still achieving extended blade movement
Solution Approach 2:
The patent transitions from one-dimensional linear trigger movement to two-dimensional rotational-tranlational motion. The trigger rotates the pinion gear (rotational dimension), which then drives the rack linearly (translational dimension). This dimensional change allows compact trigger displacement to produce extended blade movement
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 design saves force and allows for easier use by converting rotational trigger movement into linear blade movement, enabling longer blade extension with less effort and adjustable blade length.
Implementation Method 1
the resilient piece provides resilient force that enables the blade to retract into the inner cavity of the knife body
Implementation Method 2
the transmission mechanism comprises a first gear rack, a first gear, a second gear, and a second gear rack; the first gear and the second gear are pivotably connected to the knife body via a rotational axis
Implementation Method 3
the first gear rack is provided on the trigger and engages with the first gear; the second gear rack is provided on the knife rack and engages with the second gear
Data Source
AI summary
A trigger knife, having a knife body, a knife rack, a blade, a resilient piece, a trigger, a transmission mechanism and a blocking piece; the resilient piece provides resilient force to retract the blade; the trigger is partially exposed from the knife body; the transmission mechanism has first and second gear racks, and first and second gears; the first gear and the second gear are connected to the knife body; the first gear rack is provided on the trigger and engages with the first gear; the second gear rack is provided on the knife rack and engages with the second gear; the knife rack is provided with a groove; the groove extends in the same direction along which the knife rack extends; when the blade is extended to a desired position, the blocking piece abuts against a wall surface of the groove.