Portable Cutting Machine Battery Layout for Heavier Pack Balance
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Solution Overview
Problem
Existing portable cutting machines with rechargeable battery packs face operability issues due to the weight of the battery pack, which can lead to reduced usability and potential structural weaknesses in the attachment mechanism, especially when using heavier batteries.
Innovation Solution
A battery attachment portion that receives the battery pack between a front grip and a rear handle, with a configuration that includes a front surface, a rear surface, a lateral opening, and rail receivers to detachably secure the battery pack, allowing it to extend over the center plane of the handle in a lateral direction, thus distributing the weight and reducing the need for additional reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery pack is attached in a hanging posture with the attachment surface facing upward, then the battery pack can be securely attached, but the full weight of the battery pack is applied to the attachment portion of the body, requiring additional reinforcement structures
Solution Approach 1:
The patent changes the attachment orientation from a vertical hanging posture to a horizontal posture where the battery pack extends laterally over the center plane of the handle. This dimensional change allows the weight to be distributed along the lateral direction rather than concentrated at a single attachment point, eliminating the need for additional reinforcement structures while maintaining secure attachment.
2Ease of manufacture
If the battery pack protrudes from the outer wall of the machine, then the attachment is simple, but the machine size increases
Solution Approach 1:
Instead of allowing the battery pack to protrude vertically or laterally from the outer wall, the patent positions the battery pack to extend over the center plane of the handle in the lateral direction. This utilizes the internal lateral space of the handle assembly, avoiding external protrusion while maintaining a simple attachment mechanism through the rail receiver system.
3Duration of action of moving object
If heavier battery packs are used to increase power supply capacity, then the operating time is extended, but the operability of the cutting machine is reduced due to increased weight
Solution Approach 1:
The patent redistributes the battery pack weight along the lateral direction over the center plane of the handle, transforming the weight distribution from a concentrated vertical load to a distributed lateral load. This dimensional redistribution improves the moment of inertia and balance characteristics, making the tool easier to handle even with heavier battery packs, thereby extending operating time without sacrificing operability.
Data Source
AI summary
A portable cutting machine includes an electric motor, a base having a lower surface coming in contact with a workpiece, a cutting machine body coupled to an upper surface of the base and accommodating the electric motor, a handle on a rear portion of the cutting machine body and at least partially rearward from a rear end of the base, a blade on a left or a right of the handle and rotatable with the electric motor, and a battery attachment portion receiving a battery pack for powering the electric motor. The battery attachment portion includes an opening directed away from the blade, an attachment surface standing with respect to the base, and a rail receiver extending in the attachment surface to receive the battery pack in a detachable manner. The battery pack on the rail receiver extends laterally over a center plane of the handle.