Jib Stowing Device Pin Interlock Mechanism
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Solution Overview
Problem
Existing jib stowing devices for jib crane vehicles are unsafe during operations to extend the jib from a stowed state and stow the jib from an extended state, as they do not effectively prevent the jib from falling off due to erroneous uncoupling of pivot and coupling pins.
Innovation Solution
A jib stowing device with mechanically integrated pivot pin and coupling pin state detecting and restricting mechanisms that ensure both pins remain coupled during extension and stowing operations, using associating means to prevent simultaneous retraction of pins, even if one is mistakenly retracted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first stowing means is configured to be manually operated from below the jib, then the operation is simple and accessible, but the possibility of the jib falling off due to erroneous uncoupling increases
Solution Approach 1:
The patent implements a preliminary action by requiring the pivot pin to be inserted and secured before the first stowing means can be operated. The state detecting mechanism checks whether the pivot pin is properly coupled, and only when this condition is met does the restricting mechanism allow uncoupling of the first stowing means. This preliminary verification prevents erroneous uncoupling that could lead to jib failure, while maintaining simple manual operation from below the jib.
2Adaptability or versatility
If the pivot pin and coupling pin are allowed to be retracted independently, then the operation flexibility is high, but the risk of simultaneous retraction causing jib failure increases
Solution Approach 1:
The patent implements feedback through a state detecting mechanism that continuously monitors whether the pivot pin is properly coupled. This detection feedback is transmitted to the restricting mechanism, which uses the information to control whether the coupling pin can be retracted. When the pivot pin is not properly coupled, the feedback prevents coupling pin retraction, thereby preventing simultaneous retraction and jib failure while still allowing flexible independent operation when properly coupled.
3Reliability
If a safety mechanism is added to prevent erroneous uncoupling, then the jib coupling safety is improved, but the device complexity increases
Solution Approach 1:
The patent merges the safety function with the existing stowing device structure by integrating the state detecting mechanism and restricting mechanism into the current pin and stowing means system. The state detecting mechanism utilizes the existing pivot pin structure, and the restricting mechanism is incorporated into the coupling pin assembly. This merging approach provides comprehensive safety protection against erroneous uncoupling without significantly increasing device complexity, as the safety functions are embedded within the existing structural framework.
Data Source
AI summary
The danger of a jib falling off a boom due to an erroneous operation during movement of the jib between a stowage position and an extended position is eliminated. The jib is provided with a pivot pin insertion state detector, pivot pin retraction blocking element, a coupling pin insertion state detector, first and second cables, wherein movement of a coupling pin to a retracted position is restricted by a coupling pin retraction blocking element via the first cable when the pivot pin insertion state detector has detected that the pivot pin is retracted, and movement of the pivot pin to the retracted is restricted by the pivot pin retraction blocking element via the second cable when the coupling pin insertion state detector has detected that the coupling pin is retracted, so that simultaneous removal of both of the pivot pin and the coupling pin is prevented.