Crossbow Detachable Head and Rearward Cam Shift for Balance
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Solution Overview
Problem
Conventional crossbows have a weight center located close to the front section, increasing the load burden on the user's arms and affecting accuracy, and their one-piece design with a long barrel complicates structure and transportation.
Innovation Solution
A crossbow design with a barrel having a flight section and a detachable head, featuring two cam units with first and second limbs, where the second limbs are curved and connected to the barrel near the flight section, allowing the weight center to be shifted closer to the user, and enabling easy separation for transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the first and second cams are located at the symmetrical extending portions of the front section of the barrel, then the crossbow structure is compact, but the weight center is located close to the front section, increasing the load burden on the user's arms and affecting accuracy
Solution Approach 1:
The patent relocates the cams from the front section to the rear section of the barrel, and positions the second limbs extending backward instead of forward. This spatial reconfiguration in the longitudinal dimension shifts the weight center rearward, reducing the load burden on the user's arms while maintaining structural compactness
2Device complexity
If the barrel is a one-piece design with long length, then the crossbow structure is simple, but it occupies a lot of space which increases transportation cost
Solution Approach 1:
The patent divides the barrel into a stock assembly and a separate flight section that can be detachably connected. This segmentation allows the crossbow to be disassembled into smaller components for compact storage and transportation, reducing the volume occupied while maintaining structural simplicity through modular design
3Ease of operation
If the second limbs are curved and located between the curvature center and the head, then the weight center shifts closer to the user, but the limb structure becomes more complex
Solution Approach 1:
The patent employs curved second limbs with specific geometric configuration where each limb is located between its curvature center and the head. This curvature design naturally positions the weight center closer to the user's body, improving balance and accuracy while the systematic arrangement of curved limbs maintains overall structural efficiency
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
This design reduces the load burden on the user's arms, improves balance and accuracy, and simplifies transportation by allowing the crossbow components to be packed separately.
Implementation Method 1
The two second strings pull the first and second limbs by rotation of the two cams to store energy
Data Source
AI summary
A crossbow includes a barrel having a flight section and a head. The head includes a main part and two extensions extending laterally from the main part. The main part is detachably connected to the flight section. Two cam units each include two first limb connected to the two extensions, and two cams. Two second limbs each are a curved limb and have a first end and a second end. The two first ends of the two second limbs are respectively and directly connected to two sides of the flight section or the head. A first string is wrapped around and connected between the two cams. Two second strings are connected between the cams and the second end of the second limbs. The weight center of the crossbow is located close to the user's body and is benefit for operating the crossbow with high balance and accuracy.