Pump Action Firearm Slide Lock Mechanism
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Solution Overview
Problem
Conventional pump action firearms face issues with the bolt carrier being unintentionally pulled out of battery due to grasping forces, leading to operating malfunctions, and existing slide locks complicate construction and assembly by being mounted in the lower receiver.
Innovation Solution
A slide lock mechanism is introduced that is operably disposed in the upper receiver of a pump action firearm, allowing for a mechanically simpler and efficient arrangement by decoupling the bolt carrier from the barrel and using a mechanical linkage with the handguard, enabling manual cycling of the bolt slide without direct coupling to the barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slide lock mechanism is mounted in the lower receiver along with the trigger-operated firing mechanism, then the bolt carrier can be locked, but the construction and assembly of the firearm becomes complicated
Solution Approach 1:
The slide lock mechanism is separated from the lower receiver and integrated into the upper receiver assembly instead. This segmentation allows the locking function to be independently implemented without complicating the lower receiver's trigger and magazine components, thereby maintaining reliability while reducing overall construction complexity
Solution Approach 2:
A pump handle linkage mechanism serves as an intermediary between the user's manual input and the bolt carrier operation. The pump handle connects to the bolt carrier through a linkage system that enables manual cycling without requiring direct coupling to the barrel, simplifying the overall mechanical arrangement while maintaining reliable locking and cycling functions
2Ease of operation
If the bolt carrier is rigidly coupled with the pump handle, then manual cycling is enabled, but grasping forces can pull the bolt out of battery and cause malfunctions
Solution Approach 1:
The pump handle is coupled to the bolt carrier through a mechanical linkage system rather than direct rigid coupling. This intermediary linkage mechanism allows manual cycling to be transmitted to the bolt carrier while isolating the bolt's battery engagement from the grasping forces applied to the pump handle, enabling ease of operation without compromising reliability
Solution Approach 2:
The coupling between the pump handle and bolt carrier is segmented into separate functional components: the pump handle for manual input, the linkage mechanism for force transmission, and the bolt carrier for firing function. This segmentation allows each component to perform its specific function independently, preventing grasping forces from affecting bolt battery engagement while maintaining manual cycling capability
Data Source
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AI summary
A pump action firearm with bolt slide locking mechanism includes a receiver, a barrel assembly coupled by the receiver, and a bolt slide slideably disposed in the receiver for movement between rearward open breech and forward closed breech positions. A slide lock pivotably mounted to the bolt slide about a pivot axis is selectively engageable with an interference surface on the receiver. When the firearm is fired via a trigger pull, a rotatable hammer strikes and actuates the slide lock. The slide lock rotates from a locked position engaged with the interference surface to prevent the slide from moving out of the closed breech position, to an unlocked position disengaging the interference surface. This allows the slide to be manually moved to the open breech position for cycling the action. A manual actuator is provided for unlocking the slide lock absent a trigger pull.