Self-Actuating Loader Mast Latch Hook Mechanism
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Solution Overview
Problem
Current loader latching systems require manual tripping of latches and a go/stop/go operation during mounting, which is complex and unreliable, necessitating the development of a simpler and more robust system that eliminates these drawbacks.
Innovation Solution
The system incorporates latch hooks with levers that can be manipulated by a seated operator to automatically latch the loader to the tractor, eliminating the need for manual pin insertion and simplifying the mounting process by allowing the loader to be secured while the operator is seated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual pin insertion is used to secure the loader to the tractor, then the latching system is simple in structure, but the operation process becomes complex and time-consuming requiring go/stop/go maneuvers
Solution Approach 1:
The latch hooks are pre-positioned on the mounting frame and automatically engage with the masts during the mounting process. The operator only needs to manipulate the lever from the seated position, while the latch hook automatically trips open and closes during the approach and mounting sequence, eliminating the need for manual pin insertion and go/stop/go maneuvers
Solution Approach 2:
The latch hook system is self-actuating during mounting. As the mast approaches the mounting frame, the latch hook automatically trips open and engages with the mast without requiring the operator to manually insert pins or make multiple stopping maneuvers, allowing continuous forward motion during mounting
2Productivity
If automatic latching features are implemented to eliminate manual pin insertion, then the mounting process is simplified, but the system complexity increases
Solution Approach 1:
The latching system is divided into independent latch hooks, each with its own lever mechanism. This segmentation allows each latch to operate independently and simplifies the overall system design, as each component has a single, well-defined function rather than requiring a complex integrated mechanism
Solution Approach 2:
Instead of having the operator manually insert pins to secure the loader, the system inverts the approach by using spring-biased latch hooks that automatically engage and lock. The operator simply manipulates the lever to release the spring bias, allowing automatic latching during mounting, thereby simplifying the operation while maintaining system functionality
3Ease of operation
If the latch hook is positioned to automatically engage during mounting, then the mounting process is simplified, but the operator must be able to manually trip the latch from a seated position
Solution Approach 1:
The latch hook features an asymmetric geometry with a specific engagement surface and lever arm configuration. This asymmetric design allows the lever to effectively trip the latch hook from the operator's seated position while maintaining automatic engagement functionality, creating a simple yet effective mechanism that accommodates both manual and automatic operation modes
Data Source
AI summary
A front-mounted loader includes a pair of loader arms each having a rear end pivotally coupled to a loader mast which, in turn, includes lower and upper cross pins respectively located in an upwardly opening and forwardly opening pin receptacles. The forwardly opening receptacle of each loader mounting frame forms a fixed part of a latch assembly defining an upper region of the mounting frame and including latch member mounted for pivoting about a horizontal axis and having a forward nose provided with a downwardly opening receptacle which engages the upper cross pin when the mast is latched to the mounting frame. An over center biasing spring is connected to each latch member and resists movement either from a latching position or an unlatching position. Each mast carries a latch member operating rod which, during detaching the mast from the associated loader mounting frame, acts to engage and move the latch member from its unlatching position, to which it has previously been manually moved, to a latching position once the upper cross pin is moved forwardly from the associated forwardly opening pin receptacle of the mounting frame.