Jib Crane Swing Angle Limiting Collar and Stopping Tabs
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Solution Overview
Problem
Jib cranes often lack effective mechanisms to restrict their swing angle, leading to potential damage from uncontrolled rotation in confined spaces or when multiple cranes are proximate, necessitating a solution to limit the azimuth of swing to prevent collisions and damage to surrounding equipment or structures.
Innovation Solution
A mechanical stop system comprising a collar with stopping tabs positioned around the mast, which can be secured at a specific height to limit the swing angle of the jib crane by interfering with its rotational movement, using horizontal and vertical stopping tabs to define the allowed angle of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical stop system with collar and stopping tabs is installed on the mast, then the swing angle of the jib crane is limited and safety is improved, but the device complexity increases
Solution Approach 1:
The mechanical stop system is divided into separate functional components: a collar that fits around the mast and multiple stopping tabs that can be independently positioned on the collar's circumference. This segmentation allows for flexible configuration of the stop angle while keeping each individual component simple in structure.
Solution Approach 2:
The stopping tabs are designed to be repositionable on the collar, allowing the stop angle to be dynamically adjusted according to different operational requirements. This dynamic adaptability provides safety through angle limitation while avoiding permanent complex installations.
2Object-affected harmful factors
If stopping tabs are positioned at specific points around the mast circumference, then the swing angle is restricted to prevent collisions, but the ease of operation is reduced due to limited rotation range
Solution Approach 1:
The stopping tabs are pre-positioned on the collar at predetermined angular locations that define the maximum swing angle. This preliminary configuration establishes safe operational boundaries before the jib crane is put into service, preventing collisions without requiring active control during operation.
Solution Approach 2:
The collar acts as an intermediary component between the mast and the stopping tabs, providing a stable mounting structure that allows the tabs to be positioned at various angular locations. This intermediary structure enables the system to balance collision prevention with operational flexibility.
Data Source
AI summary
This disclosure provides a system and method for limiting a swing angle of a jib crane, the jib crane having a jib rotatably mounted to a mast. The device can have a collar having a collar height and a collar width, the collar being configured to be fit to the mast at a stop height. The device can also have one or more stopping tabs enagagable with the collar and configured to be positioned on the collar at one or more points about a circumference of the mast. The stop height can place the one or more stopping tabs in a position coincident with the jib to interfere with the swing angle of the jib. The method can use the device to limit the angle through which the jibe crane can swing unimpeded.