Crossbow Cocking Device Link Mechanism
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Solution Overview
Problem
Conventional crossbow cocking devices are overly complex and include too many parts, posing a risk of injury if the user fails to pull the string with sufficient force, as the string may bounce back and cause harm.
Innovation Solution
A simplified cocking device with a slot system and link unit that operates holding members to engage and disengage the string with a pivotable stop plate, allowing for safe and efficient energy storage in the crossbow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cocking device is used to assist the user to pull the string backward, then the string can be secured before the trigger is pulled, but the device includes too many parts and a complicated structure
Solution Approach 1:
The patent combines multiple functions into the holding member: it serves as both the string engagement mechanism and the pivot support for the stop plate. The slot structure integrates the guiding path and engagement feature, eliminating the need for separate components. This merging reduces the number of parts while maintaining reliable string securing through the holding member's dual functionality.
Solution Approach 2:
The holding member performs multiple functions: it guides the string along its path, engages the string for energy storage, supports the pivotable stop plate, and provides the mechanical advantage for cocking. This multi-functionality reduces device complexity by eliminating the need for dedicated components for each function, while maintaining reliability through the integrated design.
2Ease of operation
If the user pulls the string with insufficient force, then the cocking device may fail to secure the string, but the string may bounce back and injure the user and other people
Solution Approach 1:
The pivotable stop plate acts as a safety mechanism that engages with the holding member before the string can bounce back. When the user pulls the string, the stop plate pivots to engage with the holding member, creating a mechanical interlock that prevents string rebound. This beforehand engagement cushions against the harmful effect of string bounce back, protecting the user without requiring excessive pulling force.
Solution Approach 2:
The stop plate serves as an intermediary safety element between the holding member and the user. It mediates the force transmission by pivoting to engage with the holding member, thereby controlling and limiting the string's movement. This intermediary mechanism prevents direct contact between the rebounding string and the user, reducing the risk of injury while maintaining ease of operation.
Data Source
AI summary
A crossbow includes a barrel with a bow connected to the top thereof, a handle cooperated with a trigger, a retention unit and a cocking device. The cocking device includes two slots respectively defined in two sides of the barrel and each slot includes a holding member slidably located therein. A link unit is connected between the two holding members and barrel. The holding members are moved toward the front end of the barrel to hook the string, and the holding members are moved toward the rear end of the barrel to hook the string to the stop member of the retention unit by operation of the link unit. When pulling the trigger, the stop plate moves downward to release the string to shoot the arrow.