Shotgun Ejector Assembly With TAG Mounting for Field Repair
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Solution Overview
Problem
The REMINGTON® MODEL 870® pump action shotgun ejector mechanism is prone to breakage due to repeated use and misalignment, making field repairs difficult and requiring specialized tools, which is a design weakness in an otherwise reliable weapon.
Innovation Solution
A tongue-and-groove (TAG) ejector assembly that uses screws instead of rivets to secure the spring to the receiver, eliminating the need for staking through the spring and allowing field repairs with a screwdriver, featuring a TAG base and spring engagement area with a tongue-and-groove configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rivets are used to affix the ejector to the receiver, then the ejector is securely mounted, but the spring becomes vulnerable to breakage and field repair becomes difficult
Solution Approach 1:
The patent introduces a separate base component as an intermediary between the spring and the receiver. The base is affixed to the receiver using rivets, while the spring is attached to the base using staking. This mediator protects the spring from direct contact with rivets, eliminating the risk of spring breakage while maintaining secure mounting through the base-receiver connection.
2Strength
If rivets are used to affix the ejector, then secure mounting is achieved, but ease of repair deteriorates due to need for specialized tools
Solution Approach 1:
The ejector assembly is divided into separate components: the base and the spring. The base remains permanently affixed to the receiver with rivets, while the spring is attached to the base through staking. This segmentation allows the spring to be replaced independently without removing rivets or requiring specialized tools, significantly improving field repairability while maintaining the secure mounting of the base.
3Stability of the object's composition
If the spring is staked through the base, then the spring is secured in position, but misalignment can cause catastrophic failure
Solution Approach 1:
The staking process creates a buffered connection between the spring and base. The staking deforms the spring material to lock it into the base, providing a cushioning effect that accommodates minor misalignments. This prior cushioning prevents catastrophic failure by absorbing alignment errors that would otherwise cause the spring to break during operation.
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 TAG ejector assembly reduces the vulnerability to damage and wear, simplifying repairs and eliminating the need for specialized tools, ensuring the ejector mechanism remains functional with reduced maintenance requirements.
Implementation Method 1
The TAG spring is adapted and configured to engage with the TAG base in a tongue-and-groove (TAG) configuration when the TAG ejector assembly is affixed to the interior surface of the MODEL 870 receiver
Data Source
AI summary
Kits for replacing the ejector of a shotgun include an ejector spring and a base member, where the base member is designed and adapted to be affixed to the interior surface of the receiver of the shotgun, and further to engage the ejector spring in a cantilevered tongue-and-groove (TAG) configuration. TAG ejector kits, TAG ejector assemblies, and TAG ejectors are suitably configured for operation in conjunction with pump action shotguns.