Jib Coupling System for Mobile Crane Stowage
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Solution Overview
Problem
Existing jib stowage systems for mobile cranes are mechanically complex and prone to durability issues, leading to frequent maintenance and machine downtime due to the numerous connections and exposure to harsh environments, causing the jib to fall during transitions between stowed and extended positions.
Innovation Solution
A simplified jib coupling system featuring a stowage coupling assembly with a locking member and an extension pivot coupling system, utilizing a cable with a locking pin that engages and disengages to secure the jib to the boom, reducing the number of components and mechanical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple connections and restricting members are used to secure the jib during transitions, then the reliability of maintaining jib connection is improved, but the device complexity increases
Solution Approach 1:
The patent combines the restricting member and control cable into a single integrated assembly that performs multiple functions: preventing pin retraction, enabling controlled extension, and maintaining connection reliability. This merging reduces the number of separate components while achieving the same reliability goals.
Solution Approach 2:
The control cable serves multiple functions: it actuates the restricting member to prevent pin retraction, provides a mechanical link between the stowage coupling assembly and extension pivot coupling system, and maintains tension to ensure proper alignment. This multi-functionality reduces overall system complexity.
2Adaptability or versatility
If numerous connections and moving parts are exposed to harsh environments, then the adaptability to different operating conditions is improved, but the durability decreases leading to frequent maintenance
Solution Approach 1:
The patent extracts and protects critical moving parts by enclosing them within shielded openings in the boom structure. The restricting member and pin retraction mechanism are isolated from direct environmental exposure, reducing wear and corrosion while maintaining operational adaptability.
3Reliability
If control cables and restricting members are used to prevent pin retraction, then the reliability of maintaining connection is improved, but the ease of operation decreases due to additional control mechanisms
Solution Approach 1:
The control cable is automatically actuated by the relative movement between the stowage coupling assembly and extension pivot coupling system. When the jib transitions between stowed and extended positions, the cable is pulled or pushed by the moving parts themselves, eliminating the need for separate manual control mechanisms.
Data Source
AI summary
A jib coupling system a stowage coupling assembly having a locking member movable between a retracted position and an extended position, an extension pivot coupling system having a coupling member movable between a retracted position and an extended position, and a cable having a first end operably connected to the locking member and a second end having a locking pin. Movement of the locking member from the extended position to the retracted position causes the locking pin to engage the coupling member, and movement of the locking member from the retracted position to the extended position causes the locking pin to disengage the coupling member. The jib coupling system may be implemented as a part of a boom assembly and on a boom assembly of a mobile crane.