Crossbow Trigger Latch Mechanism for Safe Manual Decocking
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Solution Overview
Problem
Existing crossbow trigger mechanisms lack lightweight and smooth operation, and do not allow for safe decocking without activating the trigger.
Innovation Solution
A crossbow trigger mechanism featuring a latch with a disengage portion and a reset portion, along with a detent system, that allows the bowstring to be released and let down without operating the trigger, utilizing a cantilever arm structure and a latch retaining mechanism to maintain the latch in a disengage position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional trigger mechanism is used, then the crossbow can be fired, but it requires manual trigger operation for decocking and lacks smooth operation
Solution Approach 1:
The latch mechanism is designed to automatically engage and disengage through spring-loaded arms and detent features, eliminating the need for manual trigger operation during decocking. The reset arm automatically returns to its initial position after decocking, providing self-service operation.
Solution Approach 2:
The trigger mechanism incorporates movable latch arms that can dynamically transition between engaged and disengaged states. The spring-loaded design allows the latch to move smoothly between positions, providing dynamic adaptation to different operational modes (firing vs. decocking).
2Reliability
If the latch is retained in the second position using a detent system, then safe decocking is enabled, but the device complexity increases
Solution Approach 1:
The detent feature is pre-configured to engage automatically when the latch reaches the second position during decocking. This preliminary engagement ensures reliable retention without requiring additional active control mechanisms or complex locking systems.
Solution Approach 2:
The retention function is extracted from the main latch mechanism and implemented as a separate detent feature that engages independently. This allows the latch to be retained in the second position through a simple detent engagement rather than a complex retaining mechanism.
3Weight of moving object
If a lightweight latch system is used, then smooth operation is achieved, but the strength and stability of the latch engagement may be compromised
Solution Approach 1:
The latch mechanism is segmented into multiple functional components: the latch arm, the detent feature, the spring-loaded reset arm, and the engagement surface. Each component is optimized independently to provide lightweight construction while maintaining strong engagement through distributed contact points and mechanical advantage.
Solution Approach 2:
The latch mechanism utilizes composite construction combining spring steel for the movable arms (providing both strength and light weight) and hardened metal for the engagement surfaces (providing wear resistance and strong engagement). This composite approach optimizes both weight and strength requirements.
Data Source
AI summary
In some embodiments, a crossbow trigger mechanism comprises a housing, a trigger, a latch and a latch retaining mechanism. The housing defines a slot. The latch comprises a string catch and a trigger engaging portion. The latch is moveable with respect to the housing between first and second positions. In the first position, the trigger engaging portion contacts the trigger. In the second position, the trigger engaging portion does not contact the trigger. The latch retaining mechanism is arranged to retain the latch in the second position.