Pivoting Rear Handle Structure for Circular Saw Battery Changes
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Solution Overview
Problem
Handheld circular saws with worm-drive designs suffer from top-heavy ergonomics due to their elongated, less wide shape, making battery replacement difficult and handling cumbersome, especially during 'drop cuts'.
Innovation Solution
The rear handle is designed to pivot upwards, allowing easy access to the battery bay when swung out and blocking access when pivoted in, enhancing ergonomics and simplifying battery replacement, with a locking mechanism to ensure safety and stability during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rear handle is fixed in position, then the tool structure is simple and stable, but battery replacement is difficult and handling is cumbersome
Solution Approach 1:
The rear handle is designed to pivot between a first position (for operation) and a second position (for battery access). This dynamic positioning allows the handle to adapt between two functional states: providing stability during cutting operations and enabling easy battery replacement when swung to the second position, thereby resolving the contradiction between operational stability and maintenance accessibility.
2Ease of operation
If the rear handle is made movable for battery access, then battery replacement is easy, but tool stability during operation may be compromised
Solution Approach 1:
The handle's movable design is controlled through defined pivot positions with mechanical stops. The first position provides a stable, locked configuration during operation, while the second position enables battery access. The mechanical stops ensure the handle remains securely in either position, preventing unintended movement and maintaining structural stability during cutting operations while enabling easy battery replacement when needed.
3Ease of operation
If the handle allows free movement for battery access, then battery replacement is convenient, but accidental movement during operation could cause safety issues
Solution Approach 1:
The pivot mechanism incorporates mechanical stops that define specific positions for the rear handle. These stops create discrete, locked positions rather than continuous movement, ensuring the handle remains securely in the operational position during use. The stops prevent accidental movement while still allowing intentional positioning for battery replacement, thereby maintaining both convenience and safety.
Data Source
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AI summary
The invention relates to a battery-powered hand-held machine tool (100), particularly a hand-held circular saw, comprising an electric motor (60) for rotationally driving a tool (90) arranged on said hand-held machine tool (100), particularly a saw blade; a front handle (20) and a rear handle (30) each in terms of an advancing direction (V) of the hand-held machine tool (100); and a receiving recess (50) for receiving a replaceable battery (200), wherein said rear handle (30) is mounted such that it can pivot out, preferably upwards, about a pivot axis (S) such that when the rear handle (30) is in a state (AZ) of being pivoted out, the receiving recess (50) for receiving or removing the replaceable battery (200) is exposed and, when the rear handle (30) is in a state (EZ) of being pivoted in, the reception or removal of the replaceable battery (200) into or out of the receiving recess (50) is blocked.