Bolt Assembly Rotating Locking Head Bias Spring
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Solution Overview
Problem
Conventional rotating head bolts in hunting rifles can disengage from the locked position due to impacts, making it difficult to maintain a slow and silent locking motion, which can startle animals during hunting, and require manual intervention to re-lock, potentially missing a shot if unnoticed.
Innovation Solution
A bolt assembly with a bias means, comprising a ball and bias spring, that facilitates the locking of the rotating head by providing additional rotary and translational motion, ensuring the lugs align with the barrel seats, even under slow or impact-induced motions, preventing disengagement and ensuring a secure lock without altering the firearm's normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotating head is allowed to move freely with respect to the bolt body, then the bolt can operate normally during firing, but the rotating head may disengage from the locked position due to impacts
Solution Approach 1:
The patent applies preliminary anti-action by introducing a blocking element that prevents the rotating head from moving backward due to impacts before the problem occurs. The blocking element engages with the rotating head and the bolt body to restrict excessive rearward movement, thereby preventing disengagement from the locked position while allowing normal operation during firing.
2Reliability
If the hunter pushes the bolt sharply to lock it, then the rotating head can be forced into the locked position, but the animal may be startled and flee
Solution Approach 1:
The blocking element provides preliminary anti-action by preventing the rotating head from moving backward due to impacts before the problem occurs. This ensures the bolt remains locked without requiring sharp pushing motions that would create noise and startle the animal.
3Ease of operation
If the rotating head lacks residual energy to complete rotation, then the bolt can be locked manually, but the lugs may not align with the seats in the barrel
Solution Approach 1:
The blocking element ensures that the rotating head cannot move backward beyond a certain point, which prevents misalignment between the lugs and seats. By restricting excessive rearward movement, the blocking element ensures proper alignment is maintained or achieved during manual locking operations.
4Reliability
If a blocking element is added to prevent disengagement, then the locked position stability is improved, but the device complexity increases
Solution Approach 1:
The blocking mechanism is segmented into discrete, simple components: a blocking element with a first engagement surface that interacts with the rotating head, and a second engagement surface that interacts with the bolt body. This segmentation allows the blocking function to be added without significantly increasing overall device complexity.
Solution Approach 2:
Instead of making the rotating head actively engage with a complex locking mechanism, the patent uses a passive blocking element that simply prevents backward movement. This inversion of the approach—using a blocking rather than an active locking mechanism—reduces complexity while maintaining reliability.
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 bias means ensures reliable and silent locking of the bolt, preventing accidental disengagement and facilitating smooth operation, allowing hunters to load or re-lock the firearm quietly and securely, maintaining the firearm's operational integrity.
Implementation Method 1
a bias spring (103) contrasted by a rivet (104) forced in the radial hole (102)
Data Source
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AI summary
A bolt assembly with improved rotating locking head, comprising a rotating locking head associated with a bolt body and movable with respect to the bolt body with a combined rotary and translational motion; the rotating locking head having at least two working positions: a closed position, wherein the rotating head closes the breech of the firearm, and an open position, wherein the rotating head is at a distance from the breech; the bolt assembly has an auxiliary pusher that biases the rotating head from the open position to the closed position.