Primer Reamer Crankshaft Mechanism for Casing Pocket Straightening
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Solution Overview
Problem
The swaging process for removing primer crimp during the reloading of small arms ammunition is inconsistent and ineffective.
Innovation Solution
An ammunition reloading press primer reamer is designed with a spring-loaded base, a shuttle with a thrust bearing, a roller-bearing tip, and a crankshaft mechanism that cuts a beveled ream into the casing, assisted by a vacuum for chip evacuation and cooling, to consistently remove primer crimp and straighten the casing pocket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the swaging process is used to remove primer crimp, then the primer crimp can be removed, but the process is inconsistent and ineffective
Solution Approach 1:
The patent replaces the conventional swaging process (which uses radial pressure to deform the crimp) with a cutting/reaming process. A reaming tool with cutting edges is inserted into the casing mouth and rotated to cut away the primer crimp material, providing consistent and effective removal rather than relying on inconsistent swaging deformation.
Solution Approach 2:
The patent extracts the primer crimp material through a dedicated reaming operation that removes the crimp as a separate step from the priming process. The reaming tool is specifically designed to cut and remove only the crimp portion, separating this function from the main priming operation to improve consistency and effectiveness.
2Manufacturing precision
If a cutting tool is used to remove primer crimp, then effectiveness improves, but device complexity increases
Solution Approach 1:
The patent combines the primer installation function and primer crimp removal function into a single integrated reloading press device. The reaming tool is incorporated into the press mechanism, allowing both priming and crimp removal to be performed in one operation sequence without requiring separate tools or devices, thus managing complexity while improving effectiveness.
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 a consistent and effective method for removing primer crimp, improving the efficiency of the reloading process by ensuring precise cutting and evacuation of debris, thereby enhancing the reliability of the ammunition reloading process.
Implementation Method 1
A roller bearing can be inserted into the shuttle to reduce friction between the tip and the shuttle
Implementation Method 2
A vacuum attachment can be attached to the press to evacuate the metal chips during cutting and cool the tip
Data Source
AI summary
An ammunition reloading press primer reamer is configured to remove a primer crimp from a casing and straightening a pocket in the casing. The ammunition reloading press primer reamer has a spring arranged around a base body and arranged against a main body. A shuttle is inserted into the main body with a thrust bearing and held in place with a drilling cable. A tip is inserted into the shuttle and partially surrounded by a roller bearing. A press has a connecting rod attached to the adjustment bolt and joined to a crankshaft with a crankshaft cam. A casing holder is attached to the press and configured to hold a casing. A tool holding arm is attached to the press and further comprising a face plate attached with a plurality of screws. As the crankshaft is pulled down, the tip spins and cuts a beveled ream into the casing.