Electromechanical Primer Cap Dual Initiation
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Solution Overview
Problem
Existing electromechanical primer caps are too large for use in small-caliber ammunition due to the need for separate components for mechanical and electrical initiation, which increases their size and length.
Innovation Solution
An electromechanical primer cap design that integrates an electrically conductive pole piece acting as both an electrical connector and a mechanical impact surface, with an insulating firing bridge support body and a counter surface, allowing for selective electrical or mechanical initiation while minimizing installation height by positioning the explosive mixture closer to the base of the metal cup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electromechanical primer cap is designed with separate components for mechanical and electrical initiation, then both mechanical and electrical initiation functions are achieved, but the overall size and length of the primer cap increases
Solution Approach 1:
The patent combines the mechanical impact surface (anvil) and electrical contact surface (pole piece) into a single integrated component. The pole piece serves dual functions: it provides the electrical contact for electrical initiation while also serving as the impact surface for mechanical initiation. This merging of functions eliminates the need for separate components, thereby reducing the overall length of the primer cap while maintaining both initiation capabilities.
Solution Approach 2:
The pole piece is designed as a multi-functional element that performs both electrical and mechanical initiation functions. By making the pole piece universal—serving as both the electrical conductor and the mechanical impact surface—the design achieves dual initiation capability without requiring additional space for separate components, thus resolving the contradiction between versatility and compactness.
2Adaptability or versatility
If electrical initiation components are added to a mechanical primer cap, then electrical initiation capability is achieved, but the primer cap becomes larger and less suitable for small-caliber ammunition
Solution Approach 1:
The patent merges the electrical initiation components directly into the existing mechanical primer cap structure. The pole piece is integrated into the base of the metal cup, and the firing bridge is positioned to utilize the same space where the explosive mixture is located. This merging approach allows electrical initiation capability to be added without significantly increasing the overall volume of the primer cap.
Solution Approach 2:
The patent optimizes the spatial arrangement by positioning the pole piece vertically within the base of the metal cup, utilizing the height dimension rather than expanding the radial dimensions. The explosive mixture is positioned to contact both the pole piece and the counter surface, allowing the initiation components to be arranged in a compact vertical configuration that minimizes volume increase.
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 design achieves a compact size similar to classical mechanical primer caps, enabling their use in small-caliber ammunition by utilizing the pole piece as both an electrical connector and a firing pin impact surface, reducing the overall height and allowing for reliable initiation through either electrical or mechanical means.
Implementation Method 1
The heat is generated by a simple ohmic resistor (such as a heating wire). Once the deflagration temperature has been reached, the chemical reaction of the explosive substance begins.
Implementation Method 2
Once the deflagration temperature has been reached, the chemical reaction of the explosive substance begins.
Data Source
AI summary
The invention relates to an electromechanical primer cap, having an explosive mixture for the selective electrical or mechanical initiation of the explosive mixture, having an outer metal cup, and electrically conductive pole piece, a firing bridge support body made of an electrically insulating material, with a through-bore, on the upper side of which a firing bridge is arranged, and having a counter surface placed onto the explosive mixture, wherein a hole through which the pole piece protrudes is constructed in the vase of the metal cup. A portion of the explosive mixture lies on a contact surface of the pole piece, and the counter surface protrudes as far as the through-bore of the firing bridge support body, or into or through the bore, and continues to just above the contact surface.