Agricultural Tractor Handle with Discharge Apertures
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Solution Overview
Problem
Existing handles for three-point linkages in agricultural tractors are prone to clogging with soil and detritus, fragile, and difficult to repair, leading to operational issues and high replacement costs.
Innovation Solution
A handle made from steel with a tubular body formed from semi-tubular parts welded together, featuring discharge apertures at the lowest position to prevent soil ingress and facilitate cleaning, and a design that reduces jamming and allows for easy repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tubular sleeve handle is used, then the handle can engage with the fork to prevent accidental rotation, but the tubular sleeve easily becomes filled with soil and detritus, blocking the threads of the lower screw
Solution Approach 1:
The patent extracts the harmful accumulation of soil and detritus from the tubular sleeve by providing discharge apertures at the lower end of the sleeve. This allows the accumulated debris to be removed from the system, preventing blockage of the screw threads while maintaining the engagement function of the tubular sleeve with the fork.
Solution Approach 2:
The tubular sleeve is designed with apertures (openings) at its lower end, transforming it from a completely closed structure to one with controlled porosity. This allows debris to escape while the upper portion remains enclosed to prevent soil ingress during operation, resolving the contradiction between engagement reliability and debris accumulation.
2Strength
If a cast iron handle is used, then the handle has good wear resistance, but the handle is fragile and difficult to repair if it breaks
Solution Approach 1:
The handle is segmented into multiple components: a tubular sleeve, a grip, and a drive pin. These segments can be independently replaced if damaged, rather than requiring replacement of the entire handle assembly. This segmentation dramatically improves ease of repair while maintaining the wear resistance of the tubular sleeve portion.
Solution Approach 2:
The patent allows for replacement of individual worn or broken components (such as the grip or drive pin) with inexpensive replacements, rather than replacing the entire expensive cast iron handle. This approach makes the system more economical and easier to repair.
3Ease of manufacture
If a guide made from rolled sheet steel is used, then the handle can be produced more economically, but the movement of the handle on the housing is insufficiently precise and gives rise to noise and jamming
Solution Approach 1:
The handle combines different materials and structures: a tubular sleeve (which could be metal or composite) that provides precise guidance, combined with a grip portion. This composite approach maintains manufacturing economy while achieving the precision of movement required, avoiding the noise and jamming issues of sheet steel guides.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The handle provides improved resistance to impact, ease of maintenance, and cost-effectiveness while maintaining precise movement and noise-free operation, ensuring reliable adjustment of the three-point linkage.
Implementation Method 1
a tubular body (11) formed from semi-tubular parts (11a, 11b) which are combined together in a known way such as by welding
Implementation Method 2
the handle (10) can be mounted in an axially slidable way on the adjustment housing (4)
Implementation Method 3
the handle can be released so that it simply returns by gravity to the position in which it engages with the upper portion of the fork
Data Source
Figure 1~7
Figure 2~5
AI summary
A handle for a link of a three-point linkage comprises a tubular sleeve 11 composed of one or two or more shaped complementary parts 11a, 11b, preferably two semi-tubular parts which are symmetrical about a plane of symmetry Y-Y. Two grips 12 project from the tubular sleeve 11 and two gaps 21 are formed below the grips. The handle comprises a shaped area 18 for engagement with a corresponding projection 20 formed on the fork 6 of a link of a three-point linkage. Preferably, the handle is made from steel and the two semi-tubular parts are formed by pressing.