Rotary Cam Crossbow Trigger with Dry-Fire Prevention
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Solution Overview
Problem
Conventional crossbow trigger mechanisms lack reliable dry-fire prevention and safe release mechanisms, leading to unintended discharge of the bowstring, which can cause damage and safety hazards, especially when the crossbow is being moved or handled.
Innovation Solution
A rotary cam release/trigger device with a spring-operated pivotal cam string release mechanism, featuring a pivotable cam latch with sear surfaces, a rocker latch member, and a dry-fire prevention mechanism that engages an arrow to prevent accidental release, providing a safe and reliable trigger mechanism for crossbows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional trigger mechanism is used, then the crossbow can be operated, but it lacks reliable dry-fire prevention and safe release mechanisms leading to unintended discharge
Solution Approach 1:
The trigger mechanism is divided into separate functional components: a cam member for bowstring engagement, a rocker arm for trigger actuation, and a dry-fire prevention member with distinct lobes. This segmentation allows each component to perform its specific function reliably while maintaining overall system manageability.
Solution Approach 2:
The dry-fire prevention mechanism performs preliminary verification by requiring specific arrow shaft engagement with the prevention member's lobes before the trigger can be actuated. This preliminary action ensures that the crossbow is properly loaded before firing is permitted, preventing dry-fire accidents.
2Reliability
If the trigger mechanism provides smooth release, then shooting accuracy improves, but it may inadvertently release the bowstring without proper safety control
Solution Approach 1:
The dry-fire prevention member with its lobes creates a preliminary counter-action that must be overcome by proper arrow loading. The lobes physically block trigger actuation unless the arrow shaft is correctly positioned, thereby preventing inadvertent release while maintaining safe operation.
Solution Approach 2:
The cam member acts as an intermediary between the trigger mechanism and the bowstring. It provides controlled engagement and release points that ensure smooth, accurate bowstring release only when properly activated through the safety-controlled trigger mechanism.
3Productivity
If the crossbow is kept cocked for readiness, then firing speed improves, but the risk of accidental discharge increases when being moved or handled
Solution Approach 1:
The mechanism performs preliminary verification through the dry-fire prevention lobes that engage with the arrow shaft. This preliminary action ensures the crossbow is properly loaded and ready before allowing trigger actuation, maintaining firing readiness while eliminating accidental discharge risk during handling.
Solution Approach 2:
The cam and rocker mechanism provides self-controlled release through predetermined engagement points. The system automatically ensures proper bowstring release geometry without requiring additional user intervention, maintaining readiness while preventing mishaps through its self-regulating design.
Data Source
AI summary
A crossbow trigger and bowstring release mechanism with improved bowstring retention and release characteristics. The device enhances accurate and safe shooting with the crossbow. The trigger mechanism comprises a spring operated pivotal cam string release mechanism for releasably holding a bowstring in a drawn position. The string release latch is pivotable about a pivot point and has associated therewith a first sear surface. The trigger mechanism further includes a pivotal rocker latch member having a second sear surface which engages the cam pivot mechanism. The sear has an extended arm that engages a safety hammer release. Finally there is an improved dry-fire prevention pivot mechanism that engages an arrow when loaded to launch. When no arrow is present the dry-fire rocker engages the cam mechanism and prevents the movement of the cam to release the bowstring.