Modular Breech Block Bolt Head for Caliber and Ejection Changes

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Solution Overview

Problem

Existing breech blocks require multiple bolt heads for different calibers and cartridge ejection directions, leading to increased costs and complexity.

Innovation Solution

A bolt head with a standardized base element and detachable bezel parts that can be easily adjusted for different calibers and ejection directions, eliminating the need for complete bolt head replacements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple complete bolt heads are made for different calibers and ejection directions, then adaptability to different cartridge specifications is improved, but device complexity and manufacturing costs increase

Engineering Contradiction:

Improveadaptability to different calibersVSAvoidcomplexity of bolt head configuration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The bolt head is divided into a base element and a detachable bezel component. The bezel can be removed and replaced with different bezels for different calibers and ejection directions, while the base element remains the same. This segmentation allows adaptability without requiring multiple complete bolt heads.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base element is designed as a universal component that can support multiple bezel configurations. A single base element serves multiple functions by accommodating different bezels for various calibers and ejection directions, eliminating the need for multiple specialized bolt heads.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple complete bolt heads are made for different calibers and ejection directions, then adaptability to different cartridge specifications is improved, but manufacturing costs increase

Engineering Contradiction:

Improveadaptability to different ejection directionsVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

By segmenting the bolt head into a reusable base element and replaceable bezel, the manufacturing cost is reduced. Only the bezel needs to be manufactured in different variants, while the expensive base element is produced once and reused across multiple configurations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of discarding the entire bolt head when changing caliber or ejection direction, only the bezel is discarded/replaced while the base element is recovered and reused. This significantly reduces material waste and manufacturing costs.

Inventive Principle:

Principle #34Discarding and recovering

3Ease of manufacture

If a standardized base element with detachable bezel parts is used, then manufacturing cost is reduced, but reliability of the connection may worsen

Engineering Contradiction:

Improvemanufacturing costVSAvoidreliability of bezel connection

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The connection mechanism is extracted as a separate, specialized component designed specifically for secure attachment. The recess with elastic element and protrusion geometry creates a reliable mechanical connection that prevents detachment during operation while allowing easy replacement when needed.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12540783B2Bolt head of a breech block and breech block with such a bolt head

Publication Date: 2026.02.03 L & O HUNTING GRP

AI summary

A bolt head of a breech block includes a base element, a breech face arranged on the front of the base element, and a bezel enclosing the breech face in an annular fashion. The bezel is formed by several bezel parts detachably fastened to the base element.