Adjustable Buttstock Locking Pin Assembly Without Threaded Parts
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Solution Overview
Problem
Existing adjustable buttstock assemblies require complex machining techniques and expensive all-metal components, lacking affordability and ease of use.
Innovation Solution
A locking pin assembly made with a metal locking pin, polymer ferrule, and C-clip, utilizing a simplified manufacturing process that eliminates threaded components, allowing for assembly with non-metal parts and enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional adjustable buttstock assemblies use all-metal components with threaded engagement, then strength and reliability are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies composite materials by combining metal (locking pin) with polymer (ferrule and C-clip). The polymer ferrule provides sufficient structural support and durability while eliminating the need for threaded metal components. This composite approach maintains assembly reliability through the metal pin's strength while reducing manufacturing complexity by using simpler polymer parts that require less precise machining.
2Strength
If traditional adjustable buttstock assemblies use threaded nuts and roll pins, then structural integrity is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent extracts and eliminates the threaded nut and roll pin components from the traditional assembly. Instead, it uses a polymer ferrule that integrates the functions of both components. The ferrule provides structural support and positioning without requiring threaded engagement or separate securing elements, thereby improving ease of manufacture while maintaining sufficient structural integrity through the metal locking pin and ferrule design.
3Duration of action of stationary object
If all-metal components are used in locking pin assembly, then durability is improved, but affordability deteriorates
Solution Approach 1:
The patent uses composite materials strategically - metal for the locking pin where high durability is critical for safety and function, and polymer for the ferrule and C-clip where sufficient durability can be achieved at lower cost. This selective material approach maintains necessary component durability while significantly improving affordability by replacing expensive all-metal construction with a hybrid metal-polymer assembly.
4Manufacturing precision
If complex machining techniques are used for locking pin assembly, then precision and reliability are improved, but productivity deteriorates
Solution Approach 1:
The patent employs composite materials to resolve the precision-productivity contradiction. The metal locking pin requires precise machining for its functional features, but the polymer ferrule can be manufactured using simpler, more productive processes like injection molding. This division allows critical precision features to be maintained in the metal component while the polymer component is produced more efficiently, overall improving manufacturing productivity without sacrificing necessary assembly precision.
Data Source
AI summary
A locking pin assembly for use with an adjustable buttstock of a firearm. The locking pin assembly, in cooperation with an adjustable buttstock, may be used to permit a buttstock to be collapsed or extended in relation to a firearm's receiver. The locking pin assembly engages with the body and release lever of the buttstock to provide for their operative connection. The locking pin assembly is easily fabricated and used.