Pivoting Handle Mechanism for Ergonomic Garden Shears
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Solution Overview
Problem
Existing motor-driven garden cutting devices with oscillating blade arrangements have limited manageability and safety issues due to restricted pivot ranges, which hinder ergonomic operation and efficient cutting processes.
Innovation Solution
A hand-held garden cutting device with a handle that can be pivoted between two operating positions about a pivot axis approximately perpendicular to the cutting plane, allowing for a pulling working movement and enhanced ergonomic posture, while maintaining safety through adjustable angular orientations and locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is fixed in a straight position pointing away from the blade assembly, then safety is maintained within a limited pivoting range, but ergonomic operation and manageability are reduced
Solution Approach 1:
The handle is designed to be movable relative to the blade assembly through a pivot joint, allowing dynamic adjustment between a straight position (for safety) and an angled position (for ergonomic operation). This dynamic configuration enables the user to switch between safety-oriented and comfort-oriented handling modes as needed during different cutting tasks.
Solution Approach 2:
The handle assembly is segmented into movable components connected by pivot joints, separating the handle from the blade assembly. This segmentation allows independent movement of the handle relative to the cutting plane, enabling ergonomic positioning without compromising the integrity or safety of the blade assembly.
2Ease of operation
If the handle is allowed to pivot freely for maximum ergonomic flexibility, then ease of operation improves, but safety control deteriorates
Solution Approach 1:
The handle incorporates a pivot joint that provides controlled mobility rather than complete freedom of movement. This dynamic connection allows the handle to be repositioned for ergonomic comfort while maintaining a defined relationship to the blade assembly, ensuring that safety-critical orientations are preserved.
Solution Approach 2:
The pivot joint allows the handle to change its angular parameter relative to the blade assembly within specific limits. This parameter change enables ergonomic adjustment while constraining the range of motion to maintain safe operating configurations, balancing flexibility with safety control.
3Ease of operation
If the cutting device is designed for one-handed operation, then ease of operation improves, but control precision and safety deteriorate
Solution Approach 1:
The movable handle with pivot joint provides dynamic positioning capability that enhances one-handed control. The user can adjust the handle angle to optimize grip comfort and control precision simultaneously, making sustained one-handed operation more precise and less fatiguing.
Solution Approach 2:
The handle's angular parameter can be adjusted by the user during one-handed operation to achieve optimal control precision for different cutting tasks. This parameter adjustment compensates for the reduced control capability inherent in one-handed operation, maintaining reliability while preserving ease of operation.
Data Source
Figure 1~2(B)
Figure 3
AI summary
For a garden cutting appliance which can be handled one-handedly by a user, in particular battery-operated shears, it is proposed to make a handle arrangement displaceable in relation to a motor housing (MG) about a pivot axis (SA) which is approximately perpendicular to the cutting plane of the blade arrangement (MA) of the cutting appliance. Advantageously, the pivot axis (SA) is inclined through an inclination angle between 3° and 20° with respect to the direction of the surface normal so that, in a first operating position, in which the handle (HG) partially overlaps the blade arrangement (MA) in projection onto the cutting plane (ME), the handle (HG) assumes a greater spacing from the cutting plane than in a second operating position, in which the handle (HG) is located on that side of the pivot axis (SA) that is remote from the blade arrangement (MA).