Sander Battery Pack Positioning for Grip Balance
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Solution Overview
Problem
The current configuration of battery packs in DC sanders leads to user fatigue and unstable operations due to an unreasonable placement, affecting the tool's balance and ease of use.
Innovation Solution
A sander design with a housing that includes a first grip portion, a second grip portion, and a coupling portion, where the battery pack is positioned between these to optimize the center of gravity, allowing for stable two-handed operation and reducing fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery pack is positioned in the conventional location (not between grip portions), then the structure is simpler, but the user experiences fatigue and unstable operations
Solution Approach 1:
The battery pack positioning moves from conventional locations (front or rear of motor) to a central location between the first and second grip portions, changing the spatial dimension of weight distribution. This dimensional repositioning balances the center of gravity along the longitudinal axis, improving operational stability without significantly increasing structural complexity.
Solution Approach 2:
The battery pack serves as a counterweight element positioned strategically between the two grip portions. By placing the heavy battery pack in this central location, the design creates a balanced weight distribution that counteracts the tendency for user fatigue and instability, effectively using the battery's weight as a beneficial counterbalancing force.
2Stability of the object's composition
If the battery pack is positioned between the first grip portion and second grip portion, then the center of gravity is optimized for stable operation, but the housing structure becomes more complex
Solution Approach 1:
The housing structure incorporates a receiving space formed by the connecting portion, which creates a new spatial dimension for battery pack accommodation. This receiving space is positioned between the motor and the first grip portion, allowing the battery pack to be located optimally for center of gravity balance while integrating smoothly into the housing structure.
Solution Approach 2:
The housing is segmented into functional portions: the accommodating portion for the motor, the connecting portion with the receiving space, and the grip portions. This segmentation allows the battery pack to be positioned in the receiving space between the motor and first grip portion, optimizing center of gravity while maintaining modular structural organization.
3Ease of operation
If the first grip portion length is greater than the second grip portion length, then the balance is optimized, but the design becomes asymmetric and more complex
Solution Approach 1:
The design deliberately employs asymmetric grip portion lengths, with the first grip portion extending further than the second grip portion. This asymmetric configuration is optimized to balance the overall center of gravity and provide ergonomic hand positioning, accepting the trade-off of asymmetric shape for improved operational balance and user comfort.
Data Source
AI summary
A sander includes a motor, a housing, a battery pack, a baseplate and a driving assembly. The motor includes a motor shaft configured to rotate around a first axis. The housing includes an accommodating portion for accommodating the motor. The battery pack is configured to power the motor. The baseplate includes a baseplate plane for arranging sandpaper. The driving assembly is configured to drive at least the baseplate to move eccentrically. The housing is further provided with a first grip portion, a second grip portion, and a coupling portion. The first grip portion is configured to be gripped by one hand of a user. The second grip portion is configured to be gripped by another hand of the user.