Garden Scarifier Two-Axle Height Adjustment Mechanism
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Solution Overview
Problem
Existing garden care devices, such as scarifiers, face challenges in adjusting ground clearance and tool positioning efficiently, with existing mechanisms being complex, prone to wear, and lacking stepless adjustment capabilities.
Innovation Solution
A two-axle garden care device with a front support unit and rear base housing connected along a transverse axis, allowing for stepless adjustment of ground clearance through a screw-based adjusting mechanism, featuring a guide leg with a guide groove and support pin for precise positioning, and optionally a motorized drive for effortless adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical locking device with cam components is used to control the engaged and disengaged positions of the drive, then the drive can be securely controlled, but the cam components are highly stressed and have disadvantages in terms of long-term stability and reliability
Solution Approach 1:
The patent extracts and removes the complex mechanical safety device with cam components from the overall system. Instead of using a mechanical locking device, the invention employs a simple lever mechanism that directly controls the height adjustment without requiring additional safety interlocks, thereby eliminating the reliability issues associated with highly stressed cam components.
Solution Approach 2:
The lever mechanism is designed to be self-controlling, where the operator's direct manipulation of the lever provides both the adjustment action and the safety control function. The system serves itself by integrating the control and safety functions into a single simple mechanism rather than requiring separate complex safety devices.
2Measurement precision
If a screw mechanism is used for height adjustment, then precise positioning can be achieved, but the adjustment process requires significant time and effort
Solution Approach 1:
The patent transitions from a static screw mechanism to a dynamic lever-based adjustment system. The lever allows for quick, effortless movement between different height positions by simply lifting and repositioning the lever, eliminating the time-consuming rotational motion required by screw mechanisms while maintaining precise positioning through defined rest positions.
Solution Approach 2:
Instead of using a screw mechanism that requires rotational input to achieve linear adjustment, the invention inverts the approach by using a lever that provides direct linear displacement through pivoting motion. This reverses the traditional screw-jack principle and achieves height adjustment through a more efficient motion path.
3Adaptability or versatility
If the ground clearance is adjusted by displacing the front support unit relative to the common transverse axis, then stepless adjustment of working depth can be achieved, but the adjustment mechanism becomes more complex
Solution Approach 1:
The lever mechanism serves multiple functions simultaneously: it controls the height adjustment, provides safety interlocking, and enables stepless variation of working depth. By making the lever multi-functional, the patent achieves adaptability without proportionally increasing complexity, as a single component performs what would otherwise require multiple separate mechanisms.
4Reliability
If wear-prone components are enclosed under a cover to protect them, then safety is improved, but the operator cannot perform safety control and maintenance becomes more difficult
Solution Approach 1:
The patent removes the enclosing cover and the associated mechanical safety device from the system. By eliminating these components entirely and replacing them with a simple open lever mechanism, the invention provides both operator accessibility for safety control and ease of maintenance without requiring enclosed protective housings.
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 quick and effortless adjustment of ground clearance and working depth, providing a more stable and durable solution with stepless adjustment capabilities, improving operator convenience and tool performance.
Implementation Method 1
a guide groove 33 in which a support pin 34 is slidably held
Implementation Method 2
A particularly simple design involves using a screw mechanism for the adjusting connection. In this design, the threaded support pin can be moved within a fixed threaded bore
Data Source
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AI summary
A garden maintenance device, such as a scarifier, mulching mower, or the like, is designed as a hand-operated device (1) in the area of a handlebar (2) having a control lever (3). At least one of its working tools (5), driven by a motor (4), can be brought into a working position close to the ground and set in rotation by actuating a clutch. In an improved embodiment according to the invention, the device (1) is designed as a rolling device having two spaced-apart wheel axles (6, 7). Its front support unit (12), provided with a first wheel axle (6), is displaceable about a common transverse axis (14) relative to a base housing (13) which has the second wheel axle (7) and the drive structure.This ensures that, by means of an adjustment device (30) provided between the base housing (13) and the front support unit (12), the respective ground clearance in the area of the machining tool (5), which can be defined as the working depth, can be changed.