Crossbow Arrow Retention Device Pivotable Arm Spring
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Solution Overview
Problem
Conventional crossbow arrow retention members apply a downward force that causes the arrow head to tilt upward and reduces arrow speed, and are prone to wear due to friction, leading to ineffective arrow positioning and reduced performance.
Innovation Solution
An arrow retention device with a pivotable arm and pushing spring that securely positions the arrow before shooting, ensuring it remains upright and releases to allow the arrow to leave without tilting, while the spring's recovery force quickly resets the arm for consecutive shots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the retention member applies downward force to press the arrow, then the arrow positioning stability is improved, but the arrow head tilts upward and shooting accuracy deteriorates
Solution Approach 1:
The retention member is transformed from a static pressing structure to a dynamic pivotable arm structure. The arm can rotate around a pivot point and is equipped with a spring mechanism that allows it to adapt its position: pressing the arrow during loading, then automatically retracting during shooting to prevent arrow head tilting while maintaining positioning stability
2Stability of the object's composition
If the retention member continuously presses the arrow, then the arrow positioning is maintained, but friction increases and the retention member wears out
Solution Approach 1:
The retention member operates in periodic cycles: pressing the arrow during the loading phase, then automatically releasing and retracting during the shooting phase. This periodic press-release action reduces continuous friction contact, thereby extending the retention member's service life while maintaining effective arrow positioning when needed
3Stability of the object's composition
If the retention member applies downward force, then the arrow is secured, but the arrow speed decreases due to resistance
Solution Approach 1:
The dynamic pivotable arm with spring mechanism provides selective resistance: it applies downward force only during the loading phase to secure the arrow, then automatically retracts during the shooting phase to eliminate resistance and allow maximum arrow speed, thus resolving the contradiction between security and speed
4Device complexity
If the retention member structure is simplified, then the device complexity is reduced, but the ability to release quickly for consecutive shots deteriorates
Solution Approach 1:
The retention member incorporates a spring mechanism that enables automatic self-service operation. After the arrow is launched, the spring automatically pushes the pivotable arm back to its initial position without requiring manual intervention, thereby enabling quick reset for consecutive shots while maintaining a relatively simple overall structure
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 solution prevents arrow tilting during launch, maintains arrow speed, and extends the retention member's lifespan by reducing friction and enabling rapid, consecutive shooting.
Implementation Method 1
a pushing spring connected to the top of the arm and biased between the second end of the arm and the shooting device
Data Source
AI summary
An arrow retention device of a crossbow includes a fixing member which has one end thereof fixed to the shooting device, and an installation slot is defined axially in the underside of the fixing member. An arm is pivotably inserted into the installation slot and has a first end and a second end. The first end is exposed beyond the installation slot, and the second end of the arm is inserted into the shooting device. A restriction rod extends from each of two sides of the arm. A pushing spring connected to the top of the arm is biased between the second end of the arm and the shooting device. A retention member is connected to the arm and includes a contact portion for pressing an arrow. When shooting the arrow, the pushing spring pivots the arm back, and the contact portion is separated from the arrow.