Paintball Barrel Insert Centering With External Resilient Bands
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Solution Overview
Problem
Existing paintball gun barrels face challenges in efficiently centering interchangeable inserts due to the narrowness of the bore, requiring costly and difficult machining, and separate front and back portions for access, which complicates manufacturing and increases costs.
Innovation Solution
A barrel assembly with a unitary external barrel and resilient bands that protrude through radial apertures to center an insert without internal machining, using a single-piece design that includes extensions to secure the insert in place, reducing manufacturing complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inserts are centered using internal machining of the bore, then centering precision is improved, but manufacturing complexity and cost increase due to narrow bore access
Solution Approach 1:
Instead of machining the bore from the inside to center the insert, the patent inverts the approach by machining the exterior surface of the barrel and using external indexing features. The insert is centered through external geometry rather than internal machining, solving the access problem caused by the narrow bore.
Solution Approach 2:
The patent introduces an intermediary indexing mechanism on the exterior surface of the barrel that mediates between the barrel and the insert. This external indexing system serves as a mediator to achieve precise insert centering without requiring direct internal machining of the narrow bore.
2Ease of manufacture
If separate front and back portions are used to access the midpoint inside the bore, then insert centering becomes possible, but device complexity increases
Solution Approach 1:
The patent inverts the traditional approach of accessing the bore midpoint by splitting the barrel into front and back portions. Instead, it achieves insert centering through external machining and indexing features on a unitary barrel structure, eliminating the need for separate portions while maintaining manufacturing accessibility.
Solution Approach 2:
The patent merges the front and back portions into a single unitary barrel structure. By combining these portions and using external indexing features, the patent achieves insert centering without requiring the barrel to be split into separate sections, thus reducing structural complexity.
3Device complexity
If a unitary external barrel design is used, then manufacturing complexity is reduced, but insert centering becomes more difficult
Solution Approach 1:
The patent applies the inversion principle by moving the centering mechanism from the internal bore to the external surface of the unitary barrel. This allows the simple unitary structure to achieve precise insert centering through external indexing features rather than internal machining.
Solution Approach 2:
The patent introduces an external indexing feature on the unitary barrel as an intermediary mechanism. This external feature serves as a mediator to achieve precise insert centering while maintaining the simplicity of the unitary barrel structure, resolving the conflict between structural simplicity and centering precision.
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 efficient, cost-effective centering of interchangeable inserts without the need for internal machining, simplifying manufacturing and maintaining alignment, while allowing for interchangeable inserts with different bore sizes.
Implementation Method 1
at least one resilient band of the barrel assembly disposed around the external barrel includes extensions along an inside surface of the at least one resilient band that protrude through the at least one set of radial apertures and are urged into contact with the insert
Data Source
AI summary
Apparatus and methods relate to barrel arrangements for use with paintball guns. The barrel arrangement includes an insert that may be tubular and selectable by a user to have an inside bore diameter to provide desired fit with a paintball. An external barrel receives the insert and is attachable to a frame of the paintball gun. An externally mounted resilient band around an outside circumference of the external barrel facilitates centering and retention of the insert within the external barrel. Specifically, the external barrel includes a set of apertures through which extensions on an inside surface of the resilient band protrude into biasing contact with an outside surface of the insert.