Adjustable Elastomeric Shell Holder for Firearm
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Solution Overview
Problem
Conventional shotgun shell holders, such as the SureShell, lack adjustability in the force required to remove shells, are prone to wear, and may require a twisting motion, which can be limiting for users.
Innovation Solution
A shell holder with adjustable elastomeric elements and movable adjustment elements, allowing independent adjustment of the protrusion depth of elastomeric elements into each shell receptacle, using a locknut and adjustment bolt system to fine-tune retention force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastomeric tube is used to retain shells in the shell holder, then shells are retained securely, but the force required to remove shells is not adjustable and the elastomeric tube is subject to wear
Solution Approach 1:
The elastomeric element is made movable relative to the shell receptacle through a threaded adjustment mechanism. The elastomeric element can be positioned at different depths within the receptacle by rotating the adjustment mechanism, which moves the elastomeric element axially. This dynamic adjustment allows the user to change the protrusion distance of the elastomeric element into the bore, thereby adjusting the retention force for shells.
Solution Approach 2:
The invention changes the physical parameter of the elastomeric element's position within the receptacle. By adjusting the protrusion distance of the elastomeric element into the bore (a geometric parameter), the retention characteristics are modified. The adjustment mechanism allows continuous variation of this parameter to achieve desired retention forces.
2Reliability
If the elastomeric element protrudes deeper into the bore, then shell retention is stronger, but shell extraction becomes more difficult
Solution Approach 1:
The system transitions from a fixed elastomeric element position to a dynamically adjustable position. The user can adjust the elastomeric element's protrusion distance according to the specific mission requirements, shell conditions, and desired extraction ease. This dynamic positioning resolves the contradiction by allowing optimization of both retention strength and extraction ease for different operating conditions.
Solution Approach 2:
The invention allows changing the geometric parameter of the elastomeric element's protrusion distance into the bore. By varying this parameter, the user can achieve different balances between retention force and extraction ease, depending on the operational requirements and shell conditions.
3Device complexity
If a fixed elastomeric tube is used in the shell holder, then the structure is simple, but it cannot adapt to different mission requirements or shell variations
Solution Approach 1:
The invention introduces a threaded adjustment mechanism that enables the elastomeric element to be positioned at different depths within the receptacle. This dynamic adjustment capability allows the shell holder to adapt to different mission requirements, shell dimensional variations, and surface conditions without significantly complicating the overall structure. The adjustment mechanism adds minimal complexity while providing substantial adaptability.
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
Enables secure and adjustable shell retention in both orientations, extends elastomer life by compressing it to maintain retention, and allows for easy replacement, providing customizable retention force for each shell.
Implementation Method 1
a plurality of elastomeric elements, each associated with a different selected one of the bores, each elastomeric element having a protruding portion that protrudes a selected distance into the bore
Data Source
AI summary
Shell holders for firearms have a body including a plurality of bores, a plurality of elastomeric elements, each associated with a different selected one of the bores, each elastomeric element having a protruding portion that protrudes a selected distance into the bore, a plurality of movable adjustment elements, each connected to the body and each operably engaged to a different selected one of the elastomeric elements, wherein the selected distance the protruding portion of the elastomeric element protrudes into the bore is adjustable based on an adjustment position of each adjustment element, and the selected distance is independently adjustable for each elastomeric element. The shell holder may be for a shotgun. The movable adjustment elements may include a plurality of jaws movable with respect to the body. There may be a gap defined between the body and each jaw. The elastomeric elements may be received within the gaps.