Handheld Power Tool Safety Device for Rapid Blade Access
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Solution Overview
Problem
Existing hand-held power tools require multiple cumbersome steps to change tools, with the tool holder being inaccessible and the safety device needing to be manually adjusted, making the process inefficient and inconvenient.
Innovation Solution
The actuating element, when moved into the safety position, automatically releases the tool holder's hold, allowing it to be adjusted to a second depth position where tool changes are easier, with a separate holding element engaging to fix the tool holder in place, and a depth adjustment mechanism enabling further positioning for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tool holder is locked in the first depth position for safety, then safety is improved, but tool accessibility and ease of operation deteriorate
Solution Approach 1:
The holding device is designed to be dynamically adjustable between a first holding position (providing safety/locking) and a second holding position (providing accessibility). The device can be manually shifted between these positions, allowing the system to transition between safe operation mode and tool change mode, thus resolving the contradiction between safety and ease of operation.
2Reliability
If multiple manual adjustment steps are required for tool changes, then safety control is improved, but device complexity and time consumption worsen
Solution Approach 1:
The patent combines the safety control function and the tool holder positioning function into a single integrated holding device. By merging these functions, the device can simultaneously control safety and position the tool holder, reducing the number of separate adjustment steps required while maintaining safety control.
Solution Approach 2:
The holding device is pre-configured with two distinct holding positions (first and second positions). The first position automatically provides safety locking, and the second position automatically provides tool accessibility. This preliminary configuration eliminates the need for multiple sequential adjustment steps, as the device is already prepared with predefined positions for different operational needs.
3Reliability
If the tool holder is locked in the first depth position, then safety is improved, but productivity and time efficiency worsen
Solution Approach 1:
The holding device allows rapid dynamic transition between the first holding position (safe operation) and the second holding position (tool change). This dynamic capability enables quick switching between safety mode and tool change mode, minimizing the time spent in each state and improving overall tool change efficiency while maintaining safety requirements.
Data Source
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AI summary
The invention relates to a hand-held power tool (10), in particular a sawing machine, with a tool holder (14) arranged on a machine part (28) for receiving a working tool (15) and with a drive motor (13) for driving the tool holder (14), wherein the hand-held power tool (10) has a guide body (11) for guiding it along a workpiece surface, relative to which the machine part (28) with the tool holder (14) is movably mounted between a first and at least a second depth position (T1, T2), wherein a locking device (40) is provided for securing the movement of the tool holder (14) during a tool change of the working tool (15), which is adjustable between a locking position (S) and an operating position (B) by means of an actuating element (41). A holding device (65) with a first holding element (74) is provided for holding the housing (12) in the first depth position (T1).The actuating element (41) is coupled to the first holding element (74) in such a way that when the locking device (40) is moved into the locking position (S) with respect to the hold in the first depth position (T1), it is moved into a release position (L) and thus the machine part (28) with the tool holder (14) can be moved from the first depth position (T1) into at least one second depth position (T2) which serves as the tool change position, in which the tool holder (14) is accessible for changing the working tool (15).