Battery Chain Saw Handle Positioning for Weight Balance
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Solution Overview
Problem
Battery-powered chain saws for demanding consumers and professional users require high-performance batteries that last long and recharge quickly, while also being comfortable to carry and maneuver for uninterrupted use.
Innovation Solution
A battery-powered chain saw design that achieves a favorable distribution of masses by positioning the front handle and motor rotation axis to balance the weight of a heavy battery pack, ensuring the saw is comfortable to carry and maneuver, even with high-capacity batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If high capacity batteries are used to extend runtime and improve performance, then battery capacity and power are improved, but weight increases making the saw harder to carry and maneuver
Solution Approach 1:
The front handle assembly acts as a counterweight to balance the heavy battery pack located at the rear of the saw. By positioning the front handle with its longitudinal center line in a vertical plane that also contains the longitudinal rotation axis, the design creates a balanced mass distribution that offsets the weight of high-capacity batteries, enabling professional-grade runtime without sacrificing maneuverability
2Ease of operation
If the front handle is positioned to balance the heavy battery pack, then maneuverability and comfort are improved, but the handle configuration becomes more complex
Solution Approach 1:
The front handle assembly is designed with asymmetric positioning relative to the saw body, with its longitudinal center line aligned in a vertical plane containing the longitudinal rotation axis. This asymmetric configuration optimizes balance and maneuverability while maintaining structural simplicity through deliberate geometric relationships rather than complex mechanisms
3Power
If the motor rotation axis is aligned parallel to the transversal direction, then cutting performance is improved, but the overall saw configuration becomes more complex
Solution Approach 1:
The motor rotation axis is specifically oriented parallel to the transversal direction of the saw to optimize cutting performance in the critical cutting zone. This localized optimization of motor orientation delivers enhanced cutting power while the rest of the saw maintains a straightforward configuration, achieving high performance without overall system complexity
Data Source
Figure 1~2
Figure 3a~3b
AI summary
A battery-powered chain saw is provided which chain saw comprises a housing (10) extending in a longitudinal direction (X) between a front end (12) and a rear end (11), a rear handle (20) fixedly connected to or integral with the housing (10) and extending in the longitudinal direction (X), a front handle (30) fixedly connected to the housing (10) and an electric motor (40) arranged to drive a cutting element of the chain saw, the electric motor having a motor rotation axis (A1). The chain saw has a longitudinal rotation axis (X1). It is characterized in that a point (60) in which a center axis (A2) of an upper portion (31) of the front handle (30) intersects a vertical plane (P) comprising the longitudinal rotation axis (X1) of the chain saw, is positioned rearwardly of a point (70) in which the motor rotation axis (A1) intersects said vertical plane (P).