Dual Battery Attachment Mechanism for Reciprocating Saw Balance
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Solution Overview
Problem
Existing reciprocating saws face challenges in using rechargeable batteries with higher voltage and larger supply capacitance, as high-voltage or high-capacity batteries are expensive and lack versatility.
Innovation Solution
The design incorporates two slide attachment type battery attachment portions on the motor housing, allowing for the use of widely available rechargeable batteries, which are arranged to balance the tool, prevent detachment, and provide cooling for the batteries, while also reducing bulkiness and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a rechargeable battery with higher voltage or larger supply capacitance is used, then the power and energy supply capability is improved, but the cost increases and versatility decreases
Solution Approach 1:
The battery attachment mechanism is divided into two separate attachment portions, each capable of independently holding a battery. This segmentation allows flexible configuration where batteries can be attached in series for higher voltage or in parallel for larger capacitance, enabling the system to adapt to different power requirements while maintaining compatibility with standard battery types.
Solution Approach 2:
The patent introduces a dual-dimension battery attachment approach: vertically stacking batteries for series connection (voltage multiplication) and horizontally arranging them for parallel connection (capacitance multiplication). This dimensional flexibility allows the same attachment structure to support both high-voltage and high-capacitance configurations using standard batteries.
2Power
If two batteries are attached in series to increase voltage, then the power output is improved, but the tool becomes top-heavy and harder to control
Solution Approach 1:
The two battery attachment portions are positioned asymmetrically relative to the tool's center of gravity. One attachment portion is located closer to the center of gravity while the other is positioned farther away, creating an asymmetric weight distribution that balances the tool even when batteries are connected in series, thereby maintaining ease of operation.
Solution Approach 2:
The tool housing and internal components are strategically positioned to create a counterbalancing effect against the weight of the batteries. The asymmetric placement of attachment portions allows the structure itself to act as a counterweight system, offsetting the top-heavy effect of series-connected batteries.
3Temperature
If the battery attachment portions are positioned closer to the motor, then cooling efficiency is improved, but the tool becomes bulkier
Solution Approach 1:
The battery attachment portions are integrated directly into the motor housing structure, merging the battery mounting function with the motor support structure. This consolidation allows batteries to be positioned close to the motor for efficient heat dissipation while avoiding additional bulk, as the motor housing itself serves as the attachment structure.
Solution Approach 2:
The motor housing serves multiple functions: it supports the motor, provides structural framework, and acts as the mounting structure for battery attachment portions. This multi-functionality enables close positioning of batteries to the motor for cooling purposes without requiring separate bulkier mounting structures.
Data Source
AI summary
A motor housing of housings forming an outer casing of a tool main body is provided with two battery attachment portions allowing attachment of rechargeable batteries. The two battery attachment portions are configured as slide attachment type battery attachment portions. The two battery attachment portions are suited to slide attachment type rechargeable batteries that are attached through sliding. The two rechargeable batteries are attached in the right-left direction of the tool main body so that the two rechargeable batteries can be arranged side by side in the direction in which the tool main body extends.