Adjustable Swivel Arm Limiting Device with Mobile Junction
Solution Overview
Problem
Existing devices for limiting the rotational range of swiveling jib cranes are complex to modify and adapt, often require expensive structural changes, and lack the ability for continuous adjustment, posing safety risks and increased costs due to their installation and evaluation challenges.
Innovation Solution
A device with a reaction element integral to the jib's rotating parts, featuring mobile junctions and circumferential guides for adjustable limiting elements that can absorb collision forces, allowing for precise and safe adjustment of the rotational range without the need for additional structural tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If limiting devices are placed directly on external structures (wall, etc.), then the rotational range can be limited, but the modification of the rotational range is complex and requires moving elements that cannot be easily adapted to different configurations
Solution Approach 1:
The limiting device incorporates a mobile junction that allows the limiting element to be repositioned along the reaction element. This dynamic configuration enables continuous adjustment of the rotational range by moving the limiting element to different positions, transforming a static device into an adaptable one without requiring complex structural modifications.
Solution Approach 2:
The device is divided into distinct modular components: a reaction element integral with the rotating part, a fixed element on the non-rotating part, and a limiting element that can be independently positioned and adjusted. This segmentation allows each component to be optimized separately and facilitates easy reconfiguration by repositioning individual elements rather than modifying the entire structure.
2Adaptability or versatility
If limiting devices are placed on board of the crane with predefined ranges, then the rotation is limited within predetermined angles, but the geometry does not allow continuous and subsequent adjustment of the rotational range
Solution Approach 1:
The mobile junction enables the limiting element to be dynamically repositioned along the reaction element after installation. This provides continuous adjustability of the rotational range without requiring complex manufacturing or structural modifications, allowing the device to adapt to different operational needs while maintaining ease of installation through a standardized design.
Solution Approach 2:
The device is designed with universal characteristics that allow it to serve multiple functions and configurations. The standardized reaction element and fixed element can accommodate limiting elements at various positions, making the same basic device structure suitable for different rotational range requirements without requiring custom manufacturing or complex installation procedures.
3Adaptability or versatility
If devices are manufactured directly by the installer and/or purchaser, then the device can be customized, but the manufacturer of the crane is not responsible for any possible damage deriving from their defects and it is often difficult and expensive to evaluate the suitability and the resistance of the swiveling structure
Solution Approach 1:
The device employs universal, standardized components with defined load capacities and installation requirements. The reaction element is designed to be integral with the crane's rotating parts and is engineered to withstand the forces generated during operation. This standardized design allows the crane manufacturer to provide certified components with guaranteed load-bearing capacities, maintaining responsibility for structural suitability while still allowing customization through the adjustable limiting element.
Data Source
Figure 1~2
Figure 3
AI summary
A device for limiting the rotational range of a swiveling arm, comprising a discoidal reaction element (1) adapted to be connected to an element of said swiveling arm so as to integrally turn with said swiveling arm, and further comprising at least a limiting element (2) adapted to cooperate with at least an abutting fixed element (6), said limiting element (2) being reversibly constrainable in any circumferential position along the external perimeter of said discoidal reaction element (1), in order to determine a limiting angle of the rotational range of said swiveling arm, wherein said discoidal reaction element (1) comprises an upper face and a lower face, and wherein said limiting element (2) comprises a reversible junction (4) adapted to clamp said upper face and said lower face in a same circumferential position.