Top-Handle Chainsaw Battery Layout for Wrist Clearance
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Solution Overview
Problem
Conventional electric chain saws with large batteries interfere with the operator's hand and wrist when cutting objects far away, limiting movement and efficiency due to battery protrusion.
Innovation Solution
The electric power work device features a detachable battery mounted behind the top handle with interference reduction parts, including a recessed design and axis alignment, allowing the battery to protrude more to the side, reducing hand and wrist interference and enhancing hand movement freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large battery is mounted in the battery part behind the top handle, then the electric power supply capacity is improved, but the battery interferes with the operator's hand and wrist movement when cutting objects far away
Solution Approach 1:
The battery part is designed with asymmetric configuration where the upper end of the battery is positioned closer to the left side (for right-handed operation) rather than being centered. This asymmetric placement creates clearance between the battery and the operator's right hand and wrist, allowing free movement when cutting objects at a distance while maintaining optimal power supply capacity
Solution Approach 2:
Instead of reducing battery size to eliminate interference, the invention repositions the battery in the lateral dimension (left-right direction) rather than reducing its longitudinal or vertical dimensions. The battery protrudes more to the side (leftward for right-handed use) creating spatial separation from the hand operation zone, thus resolving the interference issue while preserving battery capacity
2Power
If the battery protrudes forward to provide sufficient power, then the power supply capability is improved, but the battery interferes with the palm holding the top handle or the wrist during operation
Solution Approach 1:
The battery is positioned asymmetrically with its front surface extending more toward the left side (for right-handed operation) rather than protruding equally in all directions. This asymmetric protrusion pattern directs the battery mass away from the hand-grip zone while maintaining forward projection for power capacity, eliminating palm and wrist interference
Solution Approach 2:
The battery part exhibits non-uniform protrusion characteristics in different spatial directions. The battery protrudes more in the lateral direction (to the left) than in the forward direction, creating a localized clearance zone in front of the top handle where the palm and wrist can move freely, while still maintaining sufficient overall battery capacity
Data Source
AI summary
Provided is an electric power work device, which is a chain saw, including: a body case; a cutting part protruding forward from the body case; a motor to drive the cutting part, and a battery. A top handle is provided at an upside with respect to the body case, and, a side handle is provided at a left side surface of the body case. The battery is detachably mounted in a battery part formed behind the top handle. Further, interference reduction part is formed behind the top handle to reduce interference with a palm holding the top handle or a wrist.