Crossbow De-cocking Mechanism Preventing Dry Fire

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Solution Overview

Problem

Existing crossbow de-cocking methods lack a safe and efficient mechanism to release the cocked bowstring without dry firing, which can damage the crossbow and pose safety risks.

Innovation Solution

A crossbow de-cocking mechanism incorporating a trigger mechanism with a string catch and trigger latch, combined with a winch assembly that selectively rotates the spool to apply tension and move the trigger latch and string catch to safely release the bowstring from the cocked position.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional de-cocking methods are used, then the bowstring can be released, but dry firing occurs causing damage and safety risks

Engineering Contradiction:

Improvesafe de-cocking operationVSAvoiddamage from dry firing

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A de-cocking lever is introduced as an intermediary mechanism between the user and the bowstring. This lever engages with a de-cocking cam that converts the lever's rotational motion into linear motion to gradually move the string catch, releasing the bowstring in a controlled manner without sudden release or dry firing

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The de-cocking mechanism performs preliminary action by gradually moving the string catch away from the bowstring before complete release. The de-cocking cam progressively disengages the string catch from the bowstring over an extended period, allowing controlled energy dissipation and preventing sudden release that would cause dry firing

Inventive Principle:

Principle #10Preliminary action

2Reliability

If a de-cocking mechanism is added, then safe release is enabled, but device complexity increases

Engineering Contradiction:

Improvesafe de-cocking operationVSAvoidmechanism structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The de-cocking lever serves multiple functions: it acts as the operating handle for de-cocking, engages with the de-cocking cam to convert motion, and works in conjunction with existing trigger mechanism components. The de-cocking cam simultaneously converts rotational motion to linear motion and controls the gradual disengagement of the string catch

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The de-cocking mechanism is integrated with the existing trigger mechanism by combining the de-cocking lever, de-cocking cam, and string catch into a unified assembly. These components work together with the existing trigger latch and safety mechanism, sharing common structural elements and mounting points on the crossbow body

Inventive Principle:

Principle #5Merging (Combining)

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 mechanism allows for safe and controlled de-cocking of the crossbow, preventing dry firing and reducing the risk of damage to the crossbow, while ensuring efficient operation.

Implementation Method 1

a winch assembly including: a spool selectively rotatable in a spool in direction and a spool out direction; a tensile member having a first end operatively engaged with the spool

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentUS20250189263A1Crossbow de-cocking method

Publication Date: 2025.06.12 HUNTERS MFG CO INC

AI summary

A crossbow de-cocking mechanism may include a trigger mechanism, a trigger latch and a winch assembly. A first input to the winch assembly may move the trigger latch to disengage the trigger mechanism. A second input to the trigger latch may move a crossbow bowstring from a cocked position to an un-cocked position.