Walk-behind Tiller Lever Arrangement for Compact Control
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Solution Overview
Problem
Conventional walk-behind tillers lack a lever to restrain and release the main clutch operating lever's switching operation, leading to a lack of compactness in the arrangement of related levers.
Innovation Solution
A walk-behind tiller design that incorporates a main clutch operating lever, a main clutch lock lever to restrain and release the clutch operation, and a parking brake lever, all arranged on the operating handle, allowing for a compact structure and operation with one hand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a main clutch operating lever and a parking brake lever are separately arranged, then each lever can be operated independently, but the overall structure becomes less compact and requires more space on the operating handle
Solution Approach 1:
The patent combines the main clutch operating lever and the parking brake lever into a single integrated lever assembly. The lever body serves dual functions: when pulled toward the operator, it operates the main clutch; when pushed away from the operator, it operates the parking brake. This merging eliminates the need for separate levers, achieving a compact structure while maintaining independent operation of both functions through different movement directions of the same lever component.
2Ease of operation
If the main clutch operating lever is easily accessible, then clutch engagement is convenient, but unintended switching to connection may occur
Solution Approach 1:
The patent introduces a lock lever that must be operated in advance to release the locking state before the main clutch operating lever can be pulled to engage the clutch. This preliminary action of moving the lock lever creates a sequential operation requirement: first release the lock, then pull the clutch lever. This prevents unintended clutch engagement because the clutch lever is physically restrained by the lock mechanism until the operator deliberately performs the preliminary unlocking action.
3Ease of operation
If the parking brake lever remains engaged during tiller movement, then the tiller can be held stationary, but loading on the brake device occurs and travel is prevented
Solution Approach 1:
The patent implements a dynamic linkage between the clutch operating lever and the parking brake lever through a connecting member. When the clutch lever is pulled to engage the main clutch and start tiller travel, this motion automatically triggers the parking brake lever to transition from the engaged state to the released state through the connecting member. This dynamic coupling ensures that the parking brake cannot remain engaged during travel, preventing loading on the brake device while maintaining the ability to hold the tiller stationary when needed.
Data Source
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AI summary
A walk-behind tiller includes a transmission case (30) and a parking brake device (100) which stops a movement of any one or both of the right and left axles (50L, 50R) which protrude from the transmission case (30) to right and left directions, wherein the parking brake device (100) is disposed between the transmission case (30) and any one or both of the right and left axles (50L, 50R), the transmission case (30) is configured with a left case and a right case, a brake mounting member (140) is fixed to the transmission case (30) by utilizing a bolt (32) which fastens the left case and the right case together, the parking brake device (100) has a brake member (120) and a brake member bracket (130) which holds the brake member (120), and the brake member bracket (130) is detachably mounted on the brake mounting member (140).