Bump Stock Lock Pin Mechanism for Firearm Mode Switching
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Solution Overview
Problem
Existing bump firing techniques for semi-automatic firearms, such as the belt loop method and commercial devices like HELLSTORM 2000 and TAC Trigger, pose safety and accuracy issues due to the need for an unnatural grip and exposure to hot gases, and may violate federal firearms regulations or require different spring sizes for varying ammunition types.
Innovation Solution
A bump-stock system with a handle and finger rest that allows for stable trigger finger positioning, enabling rapid repeat firing while maintaining control and safety, and includes a lock to switch between rapid fire and standard modes, compatible with various semi-automatic firearms without compromising accuracy or requiring different spring sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the belt loop method is used for bump firing, then the firing rate is increased, but the operator is exposed to hot gases and cannot maintain a firm grip on the firearm
Solution Approach 1:
The patent introduces a bump stock as an intermediary device between the operator and the firearm. The bump stock includes a bearing element that interfaces with the firearm's trigger mechanism and a stock body that the operator holds, eliminating direct contact between the operator's hand and the trigger area where hot gases are expelled. This mediator allows rapid firing while protecting the operator from harmful hot gases.
Solution Approach 2:
The bump stock divides the firearm operation into separate functional components: the stock body for operator control, the bearing element for trigger interaction, and the connection mechanism. This segmentation allows the operator to maintain a firm grip on the stock body while the bearing element independently interacts with the trigger, solving the contradiction between grip stability and rapid firing.
2Productivity
If the belt loop method is used for bump firing, then the firing rate is increased, but the operator loses control of the firearm due to unnatural grip
Solution Approach 1:
The bump stock serves as a mediator that provides a stable interface between the operator and the firearm. The stock body is designed to be held in a natural, balanced position, while the bearing element mechanically couples to the trigger system. This intermediary structure maintains firearm control through proper ergonomics while enabling rapid firing through mechanical trigger manipulation.
Solution Approach 2:
The bump stock incorporates dynamic elements including a spring mechanism that allows the bearing element to move with the trigger during firing cycles. This dynamic design adapts to the natural recoil and cycling of the firearm, maintaining reliable control while enabling sustained rapid fire. The spring-loaded connection absorbs recoil forces and maintains consistent contact with the trigger.
3Productivity
If commercial bump firing devices are used, then the firing rate is increased, but the same safety and accuracy issues persist
Solution Approach 1:
The bump stock is designed as a universal device that can be adapted to multiple firearm types through different bearing element configurations. It performs multiple functions: providing a stable grip interface, enabling rapid trigger manipulation, maintaining accuracy through proper ergonomics, and ensuring safety through controlled trigger engagement. This multi-functionality resolves the contradiction between increased firing rate and maintained safety/accuracy.
Solution Approach 2:
The bump stock acts as a universal intermediary that mediates between the operator and various firearm systems. The bearing element is designed to interface with different trigger mechanisms while the stock body provides consistent ergonomic control. This universal mediator solves safety and accuracy issues across different firearm platforms while maintaining high firing rates.
4Speed
If spring-based trigger resetting devices are used, then trigger reset speed is improved, but different spring sizes are required for different ammunition types
Solution Approach 1:
The bump stock utilizes the firearm's own recoil energy to drive the trigger resetting process. The bearing element is positioned and spring-loaded to be pushed by recoil forces, which automatically reset the trigger without requiring external spring mechanisms of varying strengths. This self-service approach eliminates the need for different spring sizes while maintaining fast trigger reset speeds across all ammunition types.
Solution Approach 2:
Instead of using springs to actively push the trigger forward for resetting, the invention inverts the approach by positioning the bearing element and spring mechanism to be passively driven backward by recoil forces. This inversion eliminates the need for powerful active springs while still achieving rapid trigger reset, solving the contradiction between reset speed and spring size complexity.
Data Source
AI summary
A bump stock and interface system for a semi-automatic firearm. In use, the user grasps a handle with one hand and places an index finger of the same hand firmly on a finger rest. When intending to fire a round of ammunition, the user pushes the firearm receiver forward with another hand so that the trigger collides with the immobilized finger on the finger rest. Recoil force separates the trigger from the user's finger on the finger rest. The user again pushes forward the receiver to repeat the firing cycle. A lock is selectively activated to arrest longitudinal movement of the firearm relative to the handle, thereby returning the firearm to normal semi-automatic functionality. The lock includes a retractable pin having a tip that rides in a track having a rear stop to limit over-travel of the handle.