Construction Machine Pin Retention Lever Near Cab Obstructions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing connecting pin systems in construction machines, such as hydraulic shovels, face challenges in maintaining operator workability due to structural obstructions like cabs, which hinder the secure attachment and detachment of coming-off prevention plates, leading to poor prevention of connecting pin disengagement.
Innovation Solution
A construction machine design featuring a movement prevention mechanism with an abutting member that can move between an abutting and non-abutting position, supported by the first or second member, to prevent the connecting pin from retracting unintentionally, allowing the operator to safely operate from a distance and improve workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coming-off prevention plates are attached to the tip of connecting pins, then connecting pin disengagement is prevented, but operator workability deteriorates due to insufficient work space when structures like cabs exist in the vicinity
Solution Approach 1:
The invention extracts the movement prevention function from the tip of the connecting pin and relocates it to the distal end side of the second connecting portion. This separation allows the operator to access the movement prevention mechanism from a safe distance without needing to approach the hazardous tip area near the cab, thereby improving both safety and workability while maintaining retention reliability
Solution Approach 2:
The abutting member acts as an intermediary between the connecting pin and the operator. By positioning this mechanism at the distal end side of the second connecting portion, it provides a remote interface that prevents pin disengagement without requiring the operator to work in the dangerous proximity of the cab, thus resolving the contradiction between retention effectiveness and operator safety
2Ease of operation
If the abutting member is positioned at the distal end side of the second connecting portion, then operator safety is improved by increasing work distance, but the complexity of the movement prevention mechanism increases
Solution Approach 1:
The abutting member is designed to perform multiple functions: it prevents connecting pin disengagement, provides a remote operational interface for operators, and can be integrated with existing structural components. This multi-functionality justifies the increased complexity by delivering multiple benefits from a single mechanism
Solution Approach 2:
The abutting member is designed to be movable between abutting and non-abutting positions, allowing it to adapt to different operational states. This dynamic capability enables the mechanism to provide prevention when needed while allowing controlled disengagement when required, adding functional flexibility that offsets the increased structural complexity
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A first pinhole is formed in a first member (1) in a section facing a second member (3). A second pinhole is formed in the second member (3) in a section facing the first member (1). A connecting pin (51L) is inserted into the first pinhole and the second pinhole from the side of the machine center. A coming-off prevention mechanism 6 includes a coming-off prevention lever (61). The coming-off prevention lever 61 can abut the inner end surface 510L of the connecting pin (51L). The coming-off prevention lever 61 is supported by the second member (3) to be able to move between an abutting position of abutting the inner end surface (510L) of the coupling pin (51L) and a non-abutting position of not abutting the inner end surface 510L.