Header Float Arm Lockout Tube for Zero-Torque Rigid Mode
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Solution Overview
Problem
Conventional draper headers require complex and time-consuming adjustments to switch between flexible and rigid configurations, leading to increased manufacturing and maintenance costs due to the need for precise alignment of float arms and knives, and result in non-zero torque on the lockout tube.
Innovation Solution
A locking system that includes a rotatable lockout tube, a crank, and a tensioner, allowing float arms to pivot freely in a flexible configuration and retract into contact with the header frame in a rigid configuration, eliminating the need for adjustments and reducing torque to zero, thereby simplifying manufacturing and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional draper headers use complex adjustment mechanisms to switch between flexible and rigid configurations, then the header can adapt to different operating conditions, but the device complexity and manufacturing cost increase
Solution Approach 1:
The lockout tube is designed to rotate between two distinct positions (first and second positions) corresponding to flexible and rigid configurations. This dynamic positioning allows the header to adapt between configurations without complex continuous adjustment mechanisms, achieving adaptability through discrete state changes rather than continuous variation.
Solution Approach 2:
The tensioner assembly automatically maintains proper tension on the float arms in both flexible and rigid configurations without requiring manual adjustment. The system self-regulates the tension to ensure float arms remain in contact with the ground in flexible mode and achieve proper alignment in rigid mode, eliminating the need for operator intervention and complex adjustment mechanisms.
2Manufacturing precision
If conventional draper headers require precise alignment adjustments for float arms and knives, then cutting performance is improved, but manufacturing and maintenance costs increase
Solution Approach 1:
The lockout tube rotation dynamically changes the geometric relationship between the tensioner assembly and float arms. When rotated to the second position, the tensioner assembly's orientation naturally aligns the float arms with the knives, achieving precise alignment through the mechanical geometry of the locked position rather than through complex pre-alignment procedures.
Solution Approach 2:
The tensioner assembly acts as an intermediary mechanism that translates the lockout tube's rotational position into precise float arm alignment. The tensioner's pivotable connections and tensioning action mediate between the lockout tube's positioning function and the float arms' alignment requirement, automatically achieving proper alignment when the lockout tube is in the second position.
3Stability of the object's composition
If conventional lockout systems operate with non-zero torque on the lockout tube, then the system can maintain rigid configuration, but the structural size and weight increase
Solution Approach 1:
The tensioner assembly is designed so that when the lockout tube is in the second position, the tension forces are balanced and the system reaches an equipotential state where torque on the lockout tube approaches zero. The geometric arrangement of the tensioner assembly and float arms creates a self-balancing condition that maintains rigid configuration stability without requiring continuous torque application, thereby reducing the required structural strength and weight.
Data Source
AI summary
Systems and apparatuses for articulating float arms of a harvester header between a flexible configuration and a rigid configuration are disclosed. The systems and apparatuses include a locking tube that experiences no torque or approximately no torque when the float arms are in the rigid configuration. Further, the systems and apparatuses also avoid adjustments to ensure that float arms are fully retracted, such as into abutting contact with another portion of a header.