Variable Friction Knob for Optical Device Aiming
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Solution Overview
Problem
Existing sighting systems for firearms, such as riflescopes, lack a mechanism to securely set and maintain the aiming position without risking accidental rotation, which can lead to inaccurate shots due to varying friction resistance and potential damage from high forces.
Innovation Solution
The implementation of a variable friction knob mechanism that adjusts frictional resistance through a clutch mechanism with a friction element and adjustment element, allowing for precise control over the rotation of the knob, preventing inadvertent movement while allowing high-force rotation without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed friction mechanism is used in the knob, then the aiming position can be maintained, but the mechanism is vulnerable to damage from high forces and cannot adapt to different operational needs
Solution Approach 1:
The patent implements a dynamic friction mechanism where the friction resistance can be adjusted between at least two different levels. The adjustment element allows the friction element to engage with different portions of the knob housing interior surface, providing variable friction resistance that adapts to different operational conditions while maintaining reliability under varying force levels.
Solution Approach 2:
The patent changes the friction parameter by allowing the friction element to engage with different portions of the interior surface at different radial distances from the axis. This parameter change enables the system to provide different friction resistance levels, improving both adaptability and damage resistance by matching friction levels to operational requirements.
2Stability of the object's composition
If high friction resistance is always applied to prevent accidental rotation, then aiming position stability is improved, but the knob becomes difficult to rotate when adjustment is needed
Solution Approach 1:
The patent enables dynamic adjustment of friction resistance levels. When adjustment is needed, the friction resistance can be reduced to a lower level or temporarily disengaged, making the knob easy to rotate. When positioning is complete, the friction resistance is increased to a higher level to stabilize the aiming position, thus resolving the contradiction between stability and ease of operation.
Solution Approach 2:
The patent implements periodic engagement and disengagement of friction resistance during operation. The user can periodically reduce friction for adjustment movements, then re-engage high friction for stabilization, creating a cycle of easy rotation followed by stable positioning that addresses both operational ease and aiming stability requirements.
3Device complexity
If a simple knob structure is used, then the device complexity is reduced, but the mechanism cannot provide secure setting and maintenance of aiming position under varying forces
Solution Approach 1:
The patent segments the friction engagement mechanism into distinct components: a friction element, an adjustment element, and a knob housing with an interior surface having multiple portions at different radial distances. This segmentation allows the complex function of variable friction engagement to be achieved through relatively simple, discrete parts that work together, providing reliable aiming position maintenance without excessive overall complexity.
Solution Approach 2:
The friction element acts as an intermediary between the adjustment element and the knob housing. It translates rotational adjustment into variable friction engagement with different portions of the interior surface, providing secure aiming position maintenance while keeping the overall structure relatively simple through this mediating component.
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 solution provides secure, precise control over the aiming position, reducing the likelihood of accidental rotation and minimizing the risk of damage, offering versatility and reliability in aiming accuracy.
Implementation Method 1
a friction element movable engaged with the sleeve; a friction surface; and an adjustment element engaged with the friction element... wherein a rotation of the adjustment element selectively engages the friction surface with the interior surface
Data Source
AI summary
An optical device housing has a post rotatably extending therefrom and a sleeve fixedly extending therefrom. The sleeve is disposed around the post. A knob is connected to the post. A clutch mechanism includes: a friction element movably engaged with the sleeve; a friction surface; and an adjustment element engaged with the friction element and rotatable relative to the optical device housing and the knob housing. Rotation of the adjustment element selectively engages the friction surface with the interior surface.