Grass Pickup Header Tine Guide Ridge Design
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Solution Overview
Problem
Existing grass pickup headers face issues with tine guides that are either complex and expensive or have suboptimal guidance for deformed tines, leading to increased risk of tine interference and breakage.
Innovation Solution
The design incorporates tine guides with an upright wall portion and a concave front edge featuring a lateral ridge portion, which improves guidance for deformed tines, ensuring they remain within a desired path without interfering with adjacent tines or the header frame, and are preferably made through injection molding or casting for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tine guides are integrally formed with the reel frame, then the structure provides stable tine guidance, but the frame becomes complex and expensive
Solution Approach 1:
The tine guides are separated from the reel frame and made as independent replaceable components. This segmentation allows the guides to be manufactured separately using cost-effective methods while maintaining stable guidance functionality, resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The tine guides are extracted from the integral frame structure and made as detachable components that can be independently replaced. This extraction reduces frame complexity and manufacturing cost while preserving the guidance stability function.
2Ease of manufacture
If plate steel tine guides are used with hooks and notches, then manufacturing is simplified, but guidance of deformed tines is suboptimal and adjacent tines may interfere
Solution Approach 1:
The tine guide features a ridge portion that creates a localized constraining geometry specifically designed to guide deformed tines. This local quality enhancement ensures that even when tines are bent, they are forced back into the correct path, preventing interference with adjacent tines while maintaining ease of manufacture.
Solution Approach 2:
The ridge portion acts as an intermediary element between the tine and the guide body, providing a mechanical constraint that redirects deformed tines into the proper path. This intermediary feature resolves the guidance problem without complicating the overall manufacturing process.
3Ease of manufacture
If tine guides are made with widely spaced plate steel elements, then manufacturing is easier, but deformed tines are not optimally guided and breaking risk increases
Solution Approach 1:
The continuous ridge portion running along the tine guide provides localized support at multiple points, preventing tine deformation from progressing to breakage. This local quality enhancement maintains ease of manufacture while eliminating the harmful effect of tine breakage.
Solution Approach 2:
The ridge portion provides preventive guidance that stops tine deformation before it leads to interference or breakage. This beforehand cushioning approach addresses the harmful effects before they occur, maintaining both manufacturing simplicity and tine reliability.
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
The pickup header (1) comprises a header frame (2) and one or more reel assemblies (4a,4b). Each reel assembly comprises a reel provided with a plurality of pickup tines, and further comprises a plurality of tine guides for guiding the tines at the back of the reel assembly. One or more of said tine guides (16) comprises an upright wall portion (20) having a concave front edge (22), wherein along at least the upper half of said front edge, the tine guide further comprises a ridge portion (23) that extends laterally outward from the wall portion. Said ridge portion realizes improved guidance of deformed or bent tines compared to existing designs, so that such tines are forced to move within a desired path, without interfering with adjacent tines. According to preferred embodiments of the invention, the one or more tine guides (16) are provided in the form of integrally formed pieces obtainable by injection molding or casting.