Grapple Assembly Pin Rotation via Segmented Bearing
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Solution Overview
Problem
Existing grapple assemblies are not adaptable to various sizes and types of linkage systems, leading to compatibility issues with excavator arms, and are not well-suited for use with quick couplers due to fixed pin attachments, causing unexpected disconnection.
Innovation Solution
A grapple assembly design featuring interlocking jaws with adjustable bearings, pins, and collars that allow for synchronization with different linkage systems, enabling secure connection to multiple sizes and types of linkages, including quick couplers, by using axially aligned apertures and securing slots to maintain pin independence during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first pin is fixedly attached to the lower jaw, then the grapple assembly structure is simple and reliable, but the pin cannot rotate independent of the lower jaw causing incompatibility with quick couplers
Solution Approach 1:
The first pin is divided into two independent components: the pin itself and the lower jaw. The pin is made independently rotatable from the lower jaw through a bearing assembly, allowing each component to move independently when needed while maintaining secure connection during operation.
Solution Approach 2:
The first pin assembly is transformed from a static fixed connection to a dynamic system where the pin can rotate independently within a bearing. This dynamic capability allows the pin to adapt to quick coupler rotation while maintaining secure attachment during grapple operation.
2Reliability
If the linkage system is permanently fixed on the excavator arm, then the connection is stable, but the linkage system is not adjustable for different types and sizes of pins
Solution Approach 1:
The first pin assembly is designed as a universal interface that can accommodate multiple types and sizes of linkage systems. The bearing and collar configuration allows the same grapple assembly to work with conventional fixed linkages as well as quick couplers, providing multi-functionality.
Solution Approach 2:
The pin assembly parameters (rotation capability, bearing dimensions, collar positioning) are optimized to accommodate variations in linkage system types and sizes. The adjustable nature of the bearing and collar allows adaptation to different connection requirements while maintaining stable operation.
3Ease of operation
If the quick coupler rotates about an axis proximate to the first pin, then the grapple assembly can open and close, but the fixed pin rotates inside the quick coupler causing unexpected disconnection
Solution Approach 1:
The connection system is segmented into the rotating quick coupler and the independently rotatable first pin. The pin's independent rotation capability, enabled by the bearing assembly, prevents it from rotating inside the quick coupler while still allowing the quick coupler to rotate for grapple operation.
Solution Approach 2:
The bearing assembly acts as an intermediary between the quick coupler and the lower jaw. It mediates the rotation movements, allowing the quick coupler to rotate for opening/closing while the pin remains stable relative to the lower jaw, preventing disconnection.
4Strength
If the bearing and collar are secured to the jaws using multiple dowels, then the connection strength is increased, but the assembly complexity increases
Solution Approach 1:
Multiple dowels are merged into a single integrated bearing-colla assembly. The bearing and collar work together as a unified structure that secures the pin to the jaws, eliminating the need for separate dowel fasteners while maintaining connection strength.
Solution Approach 2:
The bearing-colla assembly serves multiple functions: it secures the pin to the jaws, allows independent pin rotation, and provides structural support. This multi-functional design reduces the number of separate components needed while maintaining connection strength.
Data Source
AI summary
A connecting and adapting system for interconnecting a pair of jaws of a grapple assembly and for adapting the grapple assembly for connecting to a plurality of linkages. The system includes bearings, where the bearings have a flange, an elongated section, and a bore. The flange of the bearings abuts a portion of one of the jaws, the elongated section of the bearings interconnects the jaws, and the bore of the bearing receives a pin to provide a connecting location. A portion of the bearing, being positioned opposite the flange, receives a collar that abuts a portion of one of the jaws.