Dual-Battery Tool Layout for Better Chainsaw and Grinder Balance
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Solution Overview
Problem
Battery-powered chainsaws and angle grinders face balance issues due to the lateral arrangement of battery packs, which creates a significant width and eccentric center of gravity, leading to tilting and increased manual effort to compensate for torque, affecting accuracy and user comfort.
Innovation Solution
The battery receptacles are positioned with a lateral handle spacing greater than the center-point spacing, and the rear handle is placed to offset the center of gravity, reducing the required counter-torque, while the battery locks are arranged to minimize lateral space and facilitate intuitive pack insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If two battery receptacles are arranged next to each other in the lateral direction to supply sufficient energy, then the energy capacity is improved, but the lateral width and eccentric center of gravity increase, causing tilting and increased manual effort
Solution Approach 1:
The patent transitions from a lateral arrangement of battery receptacles to a longitudinal arrangement along the longitudinal axis of the housing. This dimensional change moves the battery receptacle center point from a lateral position away from the movement plane to a position closer to the movement plane, reducing the lever arm and consequently the torque that must be compensated by manual force at the rear handle.
2Ease of operation
If battery locks are positioned between the two battery receptacles for easy access, then the ease of operation is improved, but the lateral spacing increases, worsening the balance and center of gravity position
Solution Approach 1:
The patent relocates the battery locks from a lateral position between the battery receptacles to a longitudinal position at the rear end of the housing. This dimensional relocation allows the battery receptacles to be positioned closer together in the lateral direction, reducing the lateral spacing and consequently improving the balance and center of gravity position while maintaining easy access to the battery locks through longitudinal positioning at the rear.
3Stability of the object's composition
If the lateral handle spacing is increased to compensate for battery pack eccentricity, then the balance is improved, but the structural width and overall size increase
Solution Approach 1:
The patent resolves the balance issue by changing the arrangement dimension from lateral to longitudinal. By positioning the battery receptacles along the longitudinal axis rather than spreading them laterally, the patent achieves proper balance without increasing the lateral structural width. The battery receptacle center point is positioned closer to the movement plane through this longitudinal arrangement, reducing the need for increased lateral handle spacing.
Data Source
AI summary
A battery-powered chainsaw or angle grinder includes a housing, a motor, a tool drivable by the motor within a movement plane, a rear handle, and two battery receptacles. The tool is arranged at the front housing end. A lateral direction runs at right angles to the movement plane. The two battery receptacles lie next to each other in the lateral direction and enclose between them a center point. The center point lies, measured in the lateral direction, with a lateral center-point spacing from the movement plane of the tool. The rear handle lies, measured in the lateral direction, with a lateral handle spacing from the movement plane. The lateral handle spacing is greater than the lateral center-point spacing. A notional center axis runs between receptacles and the actuating parts of battery locks are arranged offset with respect to each other in the direction of the center axis.