Adjustable Stop Mechanism for Precision Primer Seating Depth

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Solution Overview

Problem

Existing tools for loading ammunition primers lack precision in achieving consistent primer seating depth across different types of ammunition cases and primer sizes, leading to potential misinsertion issues.

Innovation Solution

A hand priming tool with an adjustable stop mechanism that allows for precise control of primer seating depth, enabling the tool to be used with various case and primer types by moving the priming head in a controlled manner to ensure proper primer insertion without over- or under-insertion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed priming tool is used, then the structure is simple, but the primer seating depth cannot be adjusted for different case and primer types

Engineering Contradiction:

Improveadaptability to different case and primer typesVSAvoidtool structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The stop is made adjustable along the priming driver to change the primer seating depth. The stop can be positioned at different locations on the priming driver shaft, allowing the tool to adapt to different case and primer types by dynamically repositioning the stop rather than using multiple fixed tools.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A single priming tool with an adjustable stop can serve multiple functions by accommodating different primer sizes and case types. The universal design allows one tool to replace multiple specialized tools, reducing overall device complexity while increasing versatility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Manufacturing precision

If the priming head moves farther in the priming direction, then more primer insertion distance is achieved, but the risk of over-insertion increases

Engineering Contradiction:

Improveprimer seating depth precisionVSAvoidrisk of primer misinsertion

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The stop provides tactile feedback to the operator when the primer reaches the correct seating depth. By physically limiting the priming head's travel through the stop engagement, the system gives immediate feedback on primer insertion status, preventing over-insertion and ensuring consistent precision across all priming operations.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The stop is positioned in advance to prevent excessive priming head movement before it can cause harm. By preemptively limiting the travel distance through the stop mechanism, the system counteracts the potential harmful effect of over-insertion before it occurs, ensuring reliable primer seating.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS9644931B1Ammunition case priming tool

Publication Date: 2017.05.09 AOB PRODUCTS CO

AI summary

Ammunition case priming tool, associated components, and methods of use. The priming tool can be adjustable to adjust a primer seating depth in the ammunition case. An actuation mechanism includes an actuator and a primer driver drivable by the actuator for seating the primer in the case. A stop engages the primer driver to limit travel of a priming head in a priming direction to determine seating depth of the primer. The priming tool can be configured for the priming head to return to a consistent home position.