Crossbow Limb Connection Device with Quick-Release Pin Mechanism
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Solution Overview
Problem
Conventional crossbows are bulky and difficult to assemble or disassemble, requiring complex steps and multiple bolts, making them inefficient for transportation and limb replacement.
Innovation Solution
A connection structure featuring a barrel with a recess and a fixing member with a protrusion and pin system, allowing quick assembly and disassembly of the limb by a fastener and pin mechanism, along with a positioning unit using a ball and resilient member to secure the pin, facilitating easy operation and space-efficient disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional crossbows use multiple bolts and complex assembly steps to fix the limb to the barrel, then the connection strength is improved, but the assembly time and operational complexity increase
Solution Approach 1:
The connection structure is divided into distinct functional segments: the fixing member with reception hole, the protrusion with pin, and the positioning unit. This segmentation allows each component to perform its specific function efficiently, enabling quick assembly while maintaining connection strength through dedicated structural elements.
Solution Approach 2:
The positioning unit with ball and resilient member is pre-configured to automatically guide and secure the pin in the correct position during assembly. This preliminary positioning action eliminates the need for complex alignment steps and multiple bolts, reducing assembly time while ensuring proper connection.
2Strength
If conventional crossbows use multiple bolts and complex assembly steps to fix the limb to the barrel, then the connection strength is improved, but the device complexity increases
Solution Approach 1:
Multiple functions are merged into a single integrated fixing member: the reception hole for limb insertion, the protrusion for pin engagement, and the positioning unit for automatic alignment. This consolidation replaces the need for multiple separate bolts and complex assembly procedures, reducing device complexity while maintaining connection strength.
Solution Approach 2:
The positioning unit with ball and resilient member performs self-alignment and self-locking functions. The ball engages with the pin's groove to automatically position it correctly, and the resilient member provides automatic locking, eliminating the need for complex manual alignment steps and reducing overall assembly complexity.
3Strength
If the crossbow is designed to be bulky for structural stability, then the strength is improved, but the transportability deteriorates
Solution Approach 1:
The crossbow is segmented into separable components (barrel, limb, fixing member) that can be quickly assembled and disassembled. This allows the crossbow to maintain full structural stability when assembled for use, while enabling compact disassembly for easy transportation and storage.
4Ease of operation
If the crossbow uses a simple pin mechanism for quick assembly, then the ease of operation is improved, but the reliability may deteriorate
Solution Approach 1:
The positioning unit with ball and resilient member is pre-configured to automatically guide the pin into the correct position and secure it firmly. This preliminary positioning action ensures reliable connection while maintaining simple operation, as the user only needs to insert the pin without complex alignment procedures.
Solution Approach 2:
The resilient member provides automatic locking and securing of the pin in place, ensuring reliable connection without requiring complex fastening mechanisms. The ball-and-groove interface provides self-aligning and self-securing functions, maintaining both ease of operation and connection reliability.
Data Source
AI summary
A crossbow includes a barrel, a fixing member and a limb. The barrel includes a recess defined between the first and second ends of the barrel. The fixing member is engaged with the recess. A pin extends through the barrel and the fixing member to restrict the fixing member from disengaging from the recess. The pin includes a head and a shank which has a groove, a first notch and a second notch. The groove is located between the first and second notches. A positioning unit positions the pin to the barrel. A string is connected between two ends of the limb. The fixing member is able to quickly engaged with or disengaged from the recess of the barrel to quickly assemble or dis-assemble the limb relative to the barrel.