Compact Tiller Worm Drive Reversible Gear Mechanism
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Solution Overview
Problem
Conventional mini-tillers lack versatility, requiring multiple tools for different tasks due to fixed sizes and lack of reversible tine rotation, making them inefficient for both large and small tilling tasks, and difficult to maneuver and transport.
Innovation Solution
A compact tiller design with a worm drive shaft and interchangeable tine assemblies, allowing for easy conversion between larger and smaller sizes, and a reverse mechanism that enables tine rotation change without manual gear reconfiguration, using a double-direction worm drive and constant engagement gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mini-tillers use fixed-size designs, then they are simple to manufacture, but they lack versatility for different tilling tasks
Solution Approach 1:
The patent implements a dynamically reconfigurable tine assembly where tines can be selectively added or removed from the tine shaft. This allows the tiller to adapt its width and capability for different tilling tasks (small areas vs. large areas) while maintaining a compact base design. The dynamic configuration enables a single tiller to perform multiple functions that previously required separate fixed-size models.
Solution Approach 2:
The tine assembly is segmented into individual tines that can be independently attached or detached from the tine shaft. This segmentation allows flexible reconfiguration of the tiller width by selecting different numbers of tines, providing versatility for various tilling scenarios without requiring multiple complete tiller units.
2Adaptability or versatility
If conventional mini-tillers lack reversible tine rotation, then the gear mechanism is simple, but they cannot efficiently handle both forward and reverse tilling operations
Solution Approach 1:
The transmission system incorporates a dynamically switchable gear mechanism that allows reversible tine rotation. The gears can be selectively engaged or disengaged to change the direction of tine rotation, enabling the tiller to handle both forward and reverse tilling operations efficiently. This dynamic reversibility eliminates the need for separate tillers for different operational directions.
3Weight of moving object
If mini-tillers are designed to be compact and lightweight, then they are easy to transport and maneuver, but they lack the power for large-scale tilling tasks
Solution Approach 1:
The tiller employs dynamic reconfiguration of the tine assembly to optimize performance for different task scales. For small-area tasks, the compact lightweight design is maintained with fewer tines. For large-area tasks, additional tines can be attached to increase tilling width and productivity, all while preserving the ability to transport and maneuver the base unit easily.
Solution Approach 2:
The single tiller unit is designed to perform multiple functions across different scale requirements. By selectively configuring the number of tines, the same lightweight tiller can handle both small garden beds and larger areas, replacing the need for multiple tillers of different sizes and weights.
4Ease of operation
If conventional mini-tillers require manual gear reconfiguration for size changes, then the mechanism is simple, but the operation becomes time-consuming and complex
Solution Approach 1:
The tine assemblies are pre-configured with attachment features that align with corresponding receptacles on the tine shaft. This preliminary design of the attachment interface allows for quick connection and disconnection of tines without requiring complex manual gear reconfiguration, significantly reducing the time and complexity of size adjustments.
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
Enables efficient tilling of both large and small areas with a single tool, improving maneuverability and reducing weight, while allowing for easy size adjustments and reversible operation without complex gear changes, enhancing user convenience and operational safety.
Implementation Method 1
A drive-shaft, which is at least partially surrounded by the housing, is driven by the motor. The drive shaft is a worm having a first set of threads on an exterior surface thereof and a second set of threads on the exterior surface thereof.
Implementation Method 2
A first gear, a second gear, and a third gear are all supported at least partially within the housing. External teeth of the second gear are in constant engagement with external teeth of both the first and third gears.
Data Source
AI summary
A device for cultivating soil or brushing debris includes a frame supporting a transmission and a motor. The transmission defines a housing. A drive shaft, which is at least partially surrounded by the housing, is driven by the motor. The drive shaft is a worm having a first set of threads on an exterior surface thereof and a second set of threads on the exterior surface thereof. The first set of threads are spaced-apart from and angled with respect to the second set of threads. A first gear, a second gear, and a third gear are all supported at least partially within the housing. External teeth of the second gear are in constant engagement with external teeth of both the first and third gears. A shaft is fixedly attached to the second gear and an assembly is removable attached to the shaft.