Breech Bolt Protrusions for Double-Stack Magazine Stripping
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Solution Overview
Problem
Detachable double-stacked magazines in bolt-action rifles require significant force to load and can hinder the stripping of cartridges due to spring compression, especially when the spring is weakened, making it difficult to feed cartridges into the chamber efficiently.
Innovation Solution
A Cartridge Stripper device with integral protrusions on the breech bolt head that alternately engage the staggered cartridges in the magazine, facilitating their removal and feeding into the rifle's chamber without adding moving parts, ensuring durability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a detachable double-stacked magazine is used to increase round capacity, then the magazine can store more cartridges, but significant force is required to load and strip cartridges due to spring compression
Solution Approach 1:
The breech bolt head is segmented with separate protrusions that engage different cartridges in the staggered columns. The first protrusion engages a cartridge in one column while the second protrusion engages a cartridge in the other column, allowing alternating stripping without requiring the bolt to overcome the full compression force of the entire spring at once.
Solution Approach 2:
Instead of having the bolt directly pull cartridges from the compressed spring stack, the invention uses protrusions on the bolt head to push into the rims of cartridges and alternately strip them from the staggered positions. This reverses the traditional stripping mechanism and reduces the force requirement by utilizing the staggered geometry to distribute the spring force across multiple engagement points.
2Quantity of substance
If the magazine spring is compressed to hold multiple cartridges, then round capacity increases, but cartridge stripping becomes difficult when the spring is weakened
Solution Approach 1:
The stripping function is segmented into multiple protrusions on the breech bolt head, each capable of engaging a cartridge rim. This segmentation ensures that if one protrusion fails to engage properly due to spring weakness, other protrusions can still engage their respective cartridges, maintaining reliable stripping function.
Solution Approach 2:
The protrusions are positioned at specific locations on the breech bolt head to engage cartridges at different heights in the staggered columns. This local positioning ensures that each protrusion engages a cartridge at an optimal point, providing reliable stripping even when spring compression force is reduced.
3Productivity
If protrusions are added to the breech bolt head to facilitate cartridge stripping, then stripping efficiency improves, but device complexity increases
Solution Approach 1:
The protrusions are integrated directly into the breech bolt head structure, merging the stripping function with the existing bolt assembly. This eliminates the need for separate stripping mechanisms or additional moving parts, as the protrusions are formed as part of the bolt head itself.
Solution Approach 2:
The protrusions on the breech bolt head automatically engage and strip cartridges during the normal cycling of the bolt. The alternating engagement of the first and second protrusions with cartridges in the staggered columns occurs self-automatically through the bolt's forward and rearward motion, without requiring additional actuators or complex control mechanisms.
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 Cartridge Stripper effectively strips and feeds cartridges from double-stacked magazines into the bolt-action rifle's chamber with reduced loading force and increased reliability, addressing the challenges of spring compression and weakened springs, while maintaining the rifle's dependability and durability.
Implementation Method 1
An internal spring urges a follower or lifter (i.e., a shaped piece of plastic or metal) toward the open side. The spring-loaded follower in turn urges the rounds as a group up against the lips.
Data Source
AI summary
Applicant has disclosed a Method and Apparatus for stripping and feeding cartridges to enhance stripping cartridges out of a detachable double-stacked magazine, inserted into a (well opening of a) receiver of a bolt-action rifle, and to enhance feeding the cartridges into the firing chamber. In the preferred “apparatus” embodiment, Applicant's device comprises two protrusions (“bumps”) integral with, and radially spaced around, a bottom of the breech bolt head. When the rifle's breech bolt is pushed through the receiver, towards the firing chamber, a flat front face of a protrusion engages the rim of the top cartridge, pushing the cartridge out of the magazine, over the feed ramp or lip, and towards a firing chamber of the rifle. The protrusions alternate as to which engages the next top cartridge(s), due to the staggered (zigzag) columns of the cartridges in a double-stacked magazine.