Telescoping Crane Boom With Threaded-Rod Actuation Under Load
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Solution Overview
Problem
Existing cranes face challenges in efficiently telescoping under load without interference from debris and maintaining structural integrity, particularly in davit cranes which often rely on wire, rope, or cable systems that can be cumbersome and prone to entanglement.
Innovation Solution
The implementation of a telescoping boom system with a first and second telescoping boom, where the second boom is fully contained within the first, and a threaded rod mechanism allows for controlled telescoping under load, using composite materials and fixed sleeve couplings to prevent rotation and enhance structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a telescoping boom system is used to extend reach, then the crane can operate in tighter spaces, but the structural complexity increases
Solution Approach 1:
The patent implements a telescoping boom system where nested booms are placed within each other. The first telescoping boom contains a second telescoping boom, which in turn contains a third telescoping boom. This nesting arrangement allows the boom to extend to greater lengths while maintaining a compact form when retracted, effectively resolving the contradiction between achieving extended reach and maintaining structural simplicity.
2Force
If wire, rope, or cable systems are used for lifting, then the crane can handle loads, but the systems become cumbersome and prone to entanglement
Solution Approach 1:
The patent extracts and eliminates the traditional wire, rope, or cable lifting systems from the crane design. Instead of using flexible but cumbersome lifting elements, the invention employs a rigid telescoping boom structure with integrated lifting mechanisms that avoid entanglement issues while maintaining load handling capability.
Solution Approach 2:
The patent replaces the conventional flexible mechanical lifting systems (wire, rope, cable) with a rigid telescoping boom mechanism. This substitution uses the telescoping structure itself to provide both the lifting function and the structural support, eliminating the need for separate flexible lifting elements that are prone to entanglement.
3Volume of moving object
If the second telescoping boom is fully contained within the first, then the compactness is maximized, but the manufacturing precision requirements increase
Solution Approach 1:
The patent divides the telescoping boom into three distinct segments (first, second, and third telescoping booms) that can be manufactured and assembled separately. Each segment has standardized coupling mechanisms that simplify the assembly process and reduce the precision requirements compared to a monolithic telescoping structure. The segmentation allows for modular manufacturing while achieving the desired compact nested arrangement.
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
Enables safe and smooth telescoping of the crane under load, minimizing interference from debris and enhancing structural integrity, allowing for precise load handling and improved operational efficiency.
Implementation Method 1
a threaded rod rotatably coupled within the inner telescoping boom
Implementation Method 2
Many cranes require wire, rope, chain or cable which sits in a sheave to lower or lift a load
Data Source
AI summary
Implementations of cranes may include a first telescoping boom and a second telescoping boom coupled within the first telescoping boom. The second telescoping boom may be entirely within the first telescoping boom when the second telescoping boom is in a fully extended position.