Spike Tooth Harrow Tine Angle Adjustment Mechanism
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Solution Overview
Problem
Existing spike tooth harrow assemblies are complex, expensive, and time-consuming to adjust due to numerous components and the need for dismantling and repositioning of heavy sections to change the pitch angle of the teeth.
Innovation Solution
A simplified spike tooth harrow design featuring apertured brackets connected to a fore-and-aft strap with a pin for adjusting the tine angle, and a chain or link system that allows easy repositioning of the pin between apertures for quick angle changes, eliminating the need for disassembly and complex linkages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional harrow assemblies use multiple components and heavy spike tooth bar sections for mounting ranks, then the structural strength and stability are improved, but the adjustment time and operational complexity increase significantly
Solution Approach 1:
The harrow assembly is divided into modular components: individual tooth bars with teeth directly mounted to bracket members, rather than using heavy spike tooth bar sections. This segmentation allows quick adjustment by simply removing and repositioning individual tooth bars or changing pin locations in the apertured brackets, eliminating the need to handle and reposition entire heavy bar sections.
Solution Approach 2:
The bracket members are designed with apertures at different locations that allow dynamic adjustment of the tooth bar pitch angle. By moving the pin to different apertures or repositioning tooth bars on the bracket, the assembly can quickly adapt to different working conditions without requiring complex disassembly and reassembly of fixed structural components.
2Adaptability or versatility
If traditional harrow assemblies include numerous components for mounting ranks, then the adaptability for different working conditions is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The bracket members serve multiple functions: they support the tooth bars, provide adjustment mechanisms through apertures, and enable angle changes without requiring separate adjustment mechanisms. The pin system universally applies across all bracket members, providing a standardized, simple adjustment method throughout the entire harrow assembly.
Solution Approach 2:
The mounting and adjustment functions are merged into a single integrated system where the pin inserted through apertures in the bracket members simultaneously secures the tooth bar and determines the pitch angle. This eliminates the need for separate mounting hardware and adjustment mechanisms, reducing the total number of components while maintaining full adjustability.
3Manufacturing precision
If traditional harrow assemblies require dismantling components to reposition elements for angle changes, then the precision of angle adjustment is improved, but the ease of operation deteriorates
Solution Approach 1:
The apertures are pre-positioned at specific locations on the bracket members that correspond to desired pitch angles. The tooth bars are designed to be easily removable and repositionable. This preliminary arrangement of adjustment positions allows operators to quickly select and implement the desired angle without complex calculations or precise measurements during the adjustment process.
Data Source
AI summary
A simplified spike tooth harrow includes an apertured bracket pivotally connected to the fore-and-aft connecting strap extending between the tine bars. The bracket adjustably supports a tine bar from the strap. A pin selectively secured in one of the apertures contacts the strap to set the working angle of the tines on the bar when the harrow is operated in the field. A chain or link connected to the bracket at a location offset from the bracket pivot suspends the harrow from an upper drawbar assembly which is movable vertically between field-working and transport positions. When the drawbar assembly is raised to the transport position so the harrow is out of ground contact, the bracket pivots so the pin is offset from the strap and can be easily and quickly removed from the aperture and reinserted in a different aperture to change the tine angle.