Battery Pack Orientation in Power Tool Housing
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Solution Overview
Problem
Electric power tools with externally attached or partially inserted battery packs become bulky, making handling difficult due to mismatched dimensions, which can lead to increased leverage and risk of blockage during operation, especially in motor chain saws.
Innovation Solution
The battery pack is positioned within the device housing such that its width axis extends transversely to the longitudinal axis, with narrow sides parallel to the housing sides and end faces adjacent to the housing sides, optimizing the tool's length and weight distribution for improved handling and reducing the risk of blockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the battery pack is externally attached or only partially inserted, then the battery pack can be easily mounted and removed, but the power tool becomes bulky and handling becomes difficult
Solution Approach 1:
The battery pack is nested within the device housing in a recess, with only a portion protruding outward. This allows the battery pack to be easily accessible for mounting and removal while the majority of it is contained within the housing, preventing the tool from becoming bulky and maintaining comfortable handling characteristics.
2Quantity of substance
If the battery pack is positioned to maximize capacity, then the power tool achieves optimal energy storage, but the length of the power tool increases
Solution Approach 1:
Instead of extending the battery pack lengthwise along the longitudinal axis of the tool, the battery pack is oriented with its width axis transverse to the longitudinal axis. This dimensional reorientation allows maximum battery capacity to be achieved while keeping the tool's length short, as the battery pack utilizes the transverse width and height dimensions of the housing.
3Reliability
If the power tool has a longer length to accommodate the battery pack, then the battery pack can be fully integrated, but the leverage increases and blockage risk during cutting increases
Solution Approach 1:
The battery pack is reoriented so that its width axis extends transverse to the longitudinal axis of the device housing, with narrow sides parallel to first housing sides and end faces adjacent to second housing sides. This dimensional change allows full integration of the battery pack within the housing while keeping the tool's length short, thereby reducing leverage and the risk of blockage during cutting operations.
4Device complexity
If the battery pack is positioned with its width axis parallel to the longitudinal axis, then the layout is simplified, but the power tool becomes longer and harder to handle
Solution Approach 1:
Instead of aligning the battery pack's width axis with the longitudinal axis of the tool, the battery pack is positioned with its width axis transverse to the longitudinal axis. This reorientation in another dimension achieves a compact tool length for improved handling while maintaining a relatively simple layout through standardized positioning with narrow sides parallel to housing sides.
Data Source
AI summary
An electric power tool has a device housing with a rear grip extending in the longitudinal direction of the device housing. The device housing has first opposed housing sides and second opposed housing sides. An electric drive motor and its electronic control are arranged in the device housing. A battery pack compartment arranged in the device housing receives a battery pack that has a parallelepipedal shape and extends in a direction of a height axis, width axis and depth axis. The battery pack is arranged such that the width axis and the height axis extend transversely to the longitudinal axis of the device housing. The battery pack has narrow sides extending approximately parallel and at a minimal spacing relative to the first opposed housing sides, respectively. The battery pack has opposed end faces neighboring the second housing sides, respectively.