Firearm Stock Deformable Bore for Lateral Play Reduction
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Solution Overview
Problem
Conventional sliding stock and stock length adjustment systems in firearms often exhibit undesirable play between components, leading to rattling and inefficiencies in recoil management.
Innovation Solution
A recoil reduction system that includes a deformable structure within the buttstock to adjust the bore dimension for a close sliding fit with the buffer tube, reducing lateral play and enabling translational movement while maintaining a secure fit during recoil events, utilizing a biasing element and canted guide slots to offset components for optimal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional sliding stock systems are used, then the stock length can be adjusted, but undesirable play and rattling occur between components
Solution Approach 1:
The patent employs a deformable structure within the buttstock that can be selectively adjusted to change the dimensional parameters of the longitudinal bore. This allows the bore to transition between a clearance fit (for adjustment) and a close sliding fit (for stability), resolving the contradiction between adjustability and component stability through parameter modification.
Solution Approach 2:
The system performs a one-time preliminary adjustment of the deformable structure during assembly or initial setup. This preliminary action compensates for clearance uncertainties between precision machine components and molded components, establishing optimal fit conditions before normal operation, thereby eliminating play and rattling without affecting subsequent adjustability.
2Reliability
If tight clearance fit is used between bore and buffer tube, then lateral play is reduced, but translational movement during recoil is restricted
Solution Approach 1:
The patent creates a dynamic fit system where the deformable structure allows the bore dimension to change based on operational conditions. During recoil, the close sliding fit provides stability, while the deformable nature of the structure permits necessary translational movement. This dynamic adaptation resolves the contradiction between stability and movement freedom.
Solution Approach 2:
The system modifies the dimensional parameters of the bore through the deformable structure to achieve a close sliding fit that reduces lateral play while maintaining sufficient clearance for longitudinal recoil movement. The parameter change creates an anisotropic fit: tight in radial directions for stability, but loose in axial direction for recoil freedom.
3Manufacturing precision
If precision machine components with tight tolerances are used, then component fit is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The deformable structure acts as an intermediary element between precision machine components and molded components with relatively large tolerances. It compensates for the tolerance differences and clearance uncertainties, allowing the use of less expensive molded components while achieving the fit quality of precision components, thereby reducing manufacturing complexity and cost.
Solution Approach 2:
The system uses parameter changes in the deformable structure to compensate for manufacturing tolerances. By adjusting the bore dimension through deformation, the system achieves consistent fit quality regardless of the inherent tolerances of the individual components, eliminating the need for all components to be manufactured with tight tolerances.
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 system effectively minimizes unwanted play between sliding components in the battery configuration while allowing free translation during recoil, providing a one-time adjustment that compensates for machining and manufacturing tolerances, thus enhancing firearm stability and reducing rattling.
Implementation Method 1
The buttstock includes a deformable structure adapted to selectively reduce a dimension of the longitudinal bore to configure the buttstock for a close sliding fit between the longitudinal bore and the buffer tube
Implementation Method 2
a biasing element operatively coupled with the buttstock and the slide member
Data Source
AI summary
A recoil reduction system for a firearm. In some embodiments, the recoil reduction includes buffer tube housed within a buttstock, and a deformable structure for setting a clearance tolerance between the buffer tube and the buttstock to reduce lateral play while enabling smooth translation therebetween. In some embodiments, a guide pin and/or skid projections provide interference between the sliding components of the recoil reduction system when in a battery configuration, while releasing the interference during a recoil event.