Telescopic Sight Reversing System Guide Pin
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Solution Overview
Problem
Rifle scope reversing systems face challenges in maintaining precise alignment and avoiding parallax errors due to thermal fluctuations and material brittleness at low temperatures, leading to jamming and image quality issues, especially when using metal components with thermal expansion differences.
Innovation Solution
The use of guide pins with rotatable, axially offset sleeves on a common axis, where forces are distributed through the sleeves to minimize shear stresses and stress peaks, combined with materials like brass and plastic for self-lubrication and strength, reduces friction and the risk of material failure, allowing for easy installation and adjustment across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If metal screws and metal outer sleeve are used for engagement, then basic play is reduced, but thermal expansion causes jamming at low temperatures
Solution Approach 1:
The guide pin uses a composite structure with a metal core and a plastic coating layer. The metal core provides structural strength, while the plastic coating compensates for thermal expansion differences, preventing jamming at low temperatures while maintaining alignment precision.
Solution Approach 2:
The plastic coating on the guide pin has different thermal expansion characteristics compared to metal. This parameter change in material properties allows the guide pin to maintain proper clearance and prevent jamming during thermal fluctuations, especially at very low temperatures.
2Measurement precision
If plastic coating with excess dimension is used on guide pin, then play and parallax are eliminated, but jamming occurs at very low temperatures
Solution Approach 1:
The combination of metal core and plastic coating creates a bi-metallic effect where the different thermal expansion coefficients of the two materials compensate for each other, maintaining proper dimensional relationships across temperature ranges and preventing both play and jamming.
3Measurement precision
If guide pin is made excessively large to reduce play, then parallax deviation is reduced, but thermal expansion causes jamming
Solution Approach 1:
The plastic coating changes the effective dimensional parameters of the guide pin in response to temperature changes. This dynamic parameter adjustment compensates for thermal expansion effects, maintaining proper fit without causing jamming at low temperatures.
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
This design ensures non-destructive, comfortable operation across a wide temperature range without loss in image quality or parallax accuracy, is cost-effective, easy to manufacture and install, and suitable for retrofitting, while reducing the risk of jamming and material damage.
Implementation Method 1
materials like brass and plastic for self-lubrication and strength, reduces friction
Implementation Method 2
forces are distributed through the sleeves to minimize shear stresses and stress peaks
Implementation Method 3
guide pins with rotatable, axially offset sleeves on a common axis, where forces are distributed through the sleeves to minimize shear stresses and stress peaks, combined with materials like brass and plastic for self-lubrication and strength, reduces friction
Data Source
AI summary
In a reversing system (1) for telescopic sights with a guide sleeve (10) in which a linear cam (11) is arranged, wherein an outer sleeve (20) with an outer cam (21) is axially fixed and rotatably mounted on the guide sleeve (10), and in the guide sleeve (10) a socket (30) with an optical element (32) and with a guide pin (60) penetrating the linear cam (11) and the outer cam (21) is axially displaceable, the invention provides that the guide pin (60) has a first sleeve (62) and a second sleeve (63), wherein both sleeves (62, 63) are mounted on a common axis (61), and the first sleeve (62) is movable within the outer cam (21) and the second sleeve (63) is movable within the linear cam (11).