Pivoting Rear Handle for Easier Circular Saw Battery Access
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Solution Overview
Problem
Hand-held circular saws with worm-drive designs suffer from top-heavy ergonomics due to their elongated, less broad shape, making battery replacement difficult and affecting handling, especially during 'drop cuts'.
Innovation Solution
The rear handle is pivotably mounted about a pivot axis that releases or blocks the battery receiving recess, allowing easy battery insertion or removal, and includes a latching mechanism with a spring-locking force and safety switch to ensure secure operation and power flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rear handle is fixed in position, then the structure is simple and stable, but battery replacement is difficult and handling is affected
Solution Approach 1:
The rear handle is made dynamically movable through a pivot axis, allowing it to switch between a working position (pivoted in) where it blocks the receiving recess for stable operation, and a battery access position (pivoted out) where it releases the receiving recess for easy battery replacement. This dynamic positioning resolves the contradiction by providing both ease of operation and simplified structure at different times.
2Shape
If the worm gear is used to drive the tool, then the motor shaft and tool axis can be arranged at right angles, but the shape becomes elongated and top-heavy ergonomics result
Solution Approach 1:
The pivotable rear handle provides dynamic ergonomic adjustment, allowing the user to pivot the handle out of the way when accessing the battery compartment. This dynamic movement compensates for the elongated shape caused by the worm gear configuration, improving ergonomics without changing the fundamental right-angled motor-to-tool arrangement.
3Ease of operation
If the rear handle is made pivotable to release the receiving recess, then battery access is improved, but stability during operation may be reduced
Solution Approach 1:
The blocking function is extracted as a separate state rather than a continuous constraint. When the rear handle is pivoted in, it extracts the blocking action to stabilize the receiving recess during operation. When pivoted out, the blocking function is removed to enable battery access. This extraction approach allows the system to achieve both stability and accessibility without compromising either.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances handling by simplifying battery replacement and improving ergonomics, providing stability and safety features that prevent unwanted pivoting of the rear handle, thus optimizing power flow and user safety.
Implementation Method 1
a latching mechanism with a spring-locking force
Data Source
AI summary
A battery-powered hand-held machine tool, particularly a hand-held circular saw, includes an electric motor for rotational driving a tool arranged on the hand-held machine tool, particularly a saw blade, a front handle and a rear handle each in terms of an advancing direction of the hand-held machine tool, and a receiving recess for receiving a replaceable battery. The rear handle is mounted such that it can pivot out, preferably upwards, about a pivot axis such that when the rear handle is in a state of being pivoted out, the receiving recess for receiving or removing the replaceable battery is exposed and, when the rear handle is in a state of being pivoted in, the reception or removal of the replaceable battery into or out of the receiving recess is blocked.