Offset Pivot Pruning Tool for Wide-Angle Access
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Solution Overview
Problem
Handheld pruning tools often face limitations in accessing difficult-to-reach locations due to restricted rotational movement of the pruning head, leading to challenges in precision and ease of operation.
Innovation Solution
A cutting tool design featuring a longitudinal lever with a pivot housing and offset pivot axis, allowing for a wide range of motion (>200°) and incorporating a cord and pulley mechanism for enhanced operability, including a scissor-like cutting action with a support and movable blade, reducing construction complexity and operator fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pruning head is pivotally coupled to the handle to provide rotational movement, then the operability range is improved, but the structural design of the pruning head limits the range of rotational movement
Solution Approach 1:
The cutting tool employs a dynamically adjustable pruning head assembly that can rotate through more than 200 degrees relative to the longitudinal lever. The pivot housing and coupling member create a flexible joint that allows the pruning head to adapt its position dynamically, overcoming the limitations of fixed structural designs while maintaining operational control.
Solution Approach 2:
The cutting tool is divided into distinct functional segments: a longitudinal lever, a pivot housing, and a pruning head assembly. This segmentation allows each component to perform its specific function independently, with the pivot housing acting as an intermediary that enables rotational movement between the lever and the pruning head, thereby expanding the overall operability range.
2Adaptability or versatility
If the cutting blades are positioned to provide wide range of motion, then access to difficult to reach locations is improved, but the structural complexity and manufacturing cost increase
Solution Approach 1:
The offset pivot axis design serves multiple functions simultaneously: it enables the pruning head to reach difficult-to-access locations, provides structural support, and facilitates rotational movement through a standardized coupling mechanism. This multi-functionality reduces the need for additional specialized components, thereby simplifying manufacturing while achieving wide operational range.
Solution Approach 2:
The invention introduces an offset pivot axis that creates rotational movement in a dimension perpendicular to the longitudinal lever's axis. This dimensional change allows the cutting blades to access locations that would be unreachable with conventional linear arrangements, expanding the tool's versatility without proportionally increasing structural complexity.
3Ease of operation
If a cord and pulley mechanism is used to operate the cutting blades from a distant location, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
The cord and pulley mechanism acts as an intermediary system that transmits operational force from the handle portion to the cutting blades located at the pruning head. This intermediary mechanism allows the operator to control the cutting action from a convenient distance while maintaining mechanical advantage, and the pulley system is integrated into the existing pivot housing structure to minimize additional complexity.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A cutting tool (100) includes a longitudinal lever (102) defining a longitudinal axis (X-X') extending between each of a first end (104) and a second end (106). The cutting tool (100) includes a handle portion defined towards the first end (104). The cutting tool (100) includes a pivot housing (108) coupled to the second end (106) and adapted to rotate about a pivot axis (Y-Y'). The cutting tool (100) also includes a pair of cutting blades (112) coupled to the pivot housing (108) such that the pair of cutting blades (112) rotate about the pivot axis (Y-Y') along with the pivot housing (108). The cutting tool (100) further includes a coupling member (110) adapted to couple the pivot housing (108) with the longitudinal lever (102) such that the pivot axis (Y-Y') is disposed at an offset (O) to the longitudinal axis (X-X'). The offset (O) between the pivot axis (Y-Y') and the longitudinal axis (X- X') allows the pair of cutting blades (112) to be rotated to a position adjacent to the longitudinal lever (102).