Elevated Crossbow Mounting Rail for Drawstring Clearance
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Solution Overview
Problem
Existing crossbow designs face challenges in providing sufficient clearance for the drawstring to move between drawn and undrawn positions without interfering with the firing operation, leading to potential interference and recalibration issues with attached accessories.
Innovation Solution
A mounting rail assembly featuring two or more mounting bars coupled to the barrel rail, elevating the mounting rail above the flight groove, with a U-shaped profile and elastic material overmolding to secure the rail, ensuring non-interference with the drawstring and reducing flexing, and utilizing a Picatinny rail for accessory attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the mounting rail is positioned close to the barrel rail, then the accessory mounting is more compact, but the drawstring movement is interfered with
Solution Approach 1:
The mounting rail is elevated vertically above the barrel rail using mounting bars, transitioning from a horizontal arrangement to a vertical stacking arrangement. This dimensional change allows the mounting rail to be positioned close to the barrel rail in the horizontal plane while maintaining vertical clearance for drawstring movement.
Solution Approach 2:
Mounting bars are introduced as intermediary components between the barrel rail and the mounting rail. These mounting bars provide the necessary structural connection while creating the vertical space required for the drawstring to move freely between drawn and undrawn positions without interfering with the mounting rail.
2Object-generated harmful factors
If the mounting rail is elevated above the barrel rail, then drawstring movement is cleared, but the mounting structure becomes more complex
Solution Approach 1:
The mounting bars are integrated with the mounting rail assembly, combining the elevation function and the accessory mounting function into a unified structure. This merging reduces the number of separate components and simplifies the overall mounting structure while still providing the necessary clearance for drawstring movement.
Solution Approach 2:
The mounting bars serve multiple functions: they elevate the mounting rail above the barrel rail, provide structural support for the mounting rail, and create the necessary clearance space for drawstring movement. This multi-functionality reduces the need for additional separate components, thereby reducing overall structural complexity.
3Device complexity
If traditional mounting is used, then the structure is simple, but accessory stability and accuracy are compromised
Solution Approach 1:
The mounting system is segmented into distinct functional components: mounting bars for elevation and positioning, and a mounting rail for accessory attachment. This segmentation allows each component to be optimized for its specific function, with the mounting rail providing a stable, dedicated interface for accessories while the mounting bars handle the elevation and clearance requirements.
Solution Approach 2:
By elevating the mounting rail to a higher vertical dimension above the barrel rail, the system creates a stable mounting platform that is spatially separated from the moving drawstring components. This dimensional separation enhances accessory stability and accuracy by eliminating interference and vibration from the drawstring movement.
Data Source
AI summary
A crossbow includes a stock, a riser, a barrel rail coupled between the stock and the riser and defining a projectile axis, a limb assembly coupled to the riser, and a mounting rail assembly. The mounting rail assembly includes a mounting rail defining a first axial end and a second axial end, a first mounting bar coupled to the barrel rail and the first axial end of the mounting rail, and a second mounting bar coupled to the barrel rail and the second axial end of the mounting rail.