Tool-less Latch Mechanism for Harvester Concave Securing
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Solution Overview
Problem
The existing systems for securing concaves in agricultural harvesters, such as combines, are inefficient and time-consuming, requiring tools for removal and installation, which is problematic especially during field operations where time is critical.
Innovation Solution
A tool-less latch mechanism that connects a support bar and a clamping bar to secure and release concaves quickly, allowing for easy operation without the need for tools, facilitating faster removal and installation of concaves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threaded fasteners (bolts) are used to secure concaves, then the concaves are firmly secured to the frame assembly, but the removal and installation of concaves becomes time-consuming and requires tools
Solution Approach 1:
The securing mechanism is divided into multiple independent latch components (first latch, second latch, third latch, fourth latch) distributed at different locations along the concave. Each latch can be independently operated to secure or release the concave, allowing for modular and efficient replacement without requiring complete disassembly of all fasteners simultaneously.
Solution Approach 2:
The patent replaces the traditional threaded fastener system (requiring tools for tightening and loosening) with a mechanical latch system that uses lever arms, cam surfaces, and spring-loaded components. This substitution eliminates the need for threaded connections and allows for tool-free operation through simple manual manipulation of the latch handles.
2Reliability
If threaded fasteners are used to secure concaves, then the concaves are firmly secured to the frame assembly, but the operation becomes difficult and complex requiring tools
Solution Approach 1:
The latch mechanism incorporates spring-loaded components that automatically engage with the concave and frame assembly once the latch handle is moved to the closed position. The spring force maintains continuous pressure to secure the concave firmly, and the same spring mechanism automatically releases when the handle is opened, eliminating the need for manual tightening or loosening operations.
Solution Approach 2:
The patent replaces the traditional threaded fastener system (requiring tools for tightening and loosening) with a mechanical latch system that uses lever arms, cam surfaces, and spring-loaded components. This substitution eliminates the need for threaded connections and allows for tool-free operation through simple manual manipulation of the latch handles.
3Ease of operation
If a simple securing mechanism is used, then the operation is easy and quick, but the securing firmness and reliability may be compromised
Solution Approach 1:
The patent combines multiple latch mechanisms (first, second, third, and fourth latches) along the length of the concave, each securing a different section. This distribution of securing points ensures that the entire concave is firmly held to the frame assembly at multiple locations, preventing any single point of failure while maintaining overall structural integrity and reliability.
Solution Approach 2:
The latch mechanism incorporates cam surfaces with curved geometries that provide mechanical advantage during engagement. The cam surface geometry allows a small rotational movement of the latch handle to generate a large clamping force, ensuring firm securing while requiring minimal operational effort from the user.
Data Source
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AI summary
An agricultural harvesting machine (10) includes a chassis (12) and a threshing system (24) carried by the chassis (12). The threshing system (24) includes a rotor (40), a frame assembly (80) and at least one concave (42) carried by the frame assembly (80). A latch mechanism (76) supports and secures the concave (42) relative to the frame assembly (80) and includes a concave support bar (72), a clamping bar (74) and a quick-connect, over center latch (92) for tool-less operation.