Crossbow Limb and String Pack Modular Design
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Solution Overview
Problem
Conventional crossbows require frequent replacement and maintenance of strings and cables, which complicates the process due to the need to remove multiple parts from the barrel, affecting operational efficiency.
Innovation Solution
A limb and string pack for crossbows featuring a base with links and bolts that securely attach to the barrel, allowing easy installation and removal, with cables extending through a passage to avoid interference with the string operation, enabling convenient replacement and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the string and cables are installed at two different planes in conventional crossbows, then the operation of the string is not affected by the cables, but the process of replacing and maintaining the string and cables requires removing a lot of parts from the barrel
Solution Approach 1:
The crossbow is divided into modular components: the limb and string pack can be removed as a single unit from the barrel, while the cable assembly remains integrated with the barrel. This segmentation allows maintenance of the string and cables without removing multiple individual parts, resolving the contradiction between maintaining string operation independence and reducing maintenance complexity
Solution Approach 2:
The string and cable assembly is extracted as a separate removable pack that can be taken out as one unit. The pack includes the string, cables, limbs, and cams integrated together, allowing maintainers to remove just this pack for maintenance without disassembling the entire crossbow, thus reducing the number of parts that need to be removed while maintaining functional independence
2Ease of repair
If multiple parts are removed from the barrel for string and cable replacement, then the string and cables can be accessed for maintenance, but the operational efficiency is affected
Solution Approach 1:
The limb and string pack is segmented as a separate modular unit that can be quickly removed and reinstalled. This segmentation provides easy access to the string and cables for maintenance while minimizing the time and effort required, thus maintaining operational efficiency
Solution Approach 2:
The string, cables, limbs, and cams are pre-assembled into an integrated pack before installation. This preliminary assembly means that during maintenance, the entire assembly can be replaced as one unit without needing to individually access and manipulate multiple separate components, improving both ease of repair and operational efficiency
Data Source
AI summary
A limb and string pack for a crossbow includes a base which is installed to an installation recess in the front end of the barrel of the crossbow. The base includes a passage. Two links respectively extend from the base and beyond the two end openings and toward the front end of the barrel. Two limbs are connected to the two links. Two cams are respectively and pivotably connected to the two limbs. A string is connected between the two cams. Two cables respectively extend through the passage of the base and are connected to the limbs and the cams. A bolt secure the base to the links and the barrel. Another bolt secures the links to the front end of the barrel of the crossbow. The base, the links and the limbs are easily removed by unscrewing the two bolts to maintain the strings and the cables.