Adjustable Protective Device for Power Tool Maintenance
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Solution Overview
Problem
Power tools with protective devices face difficulties in cleaning the operating unit when it becomes clogged, as the protective device shields the area and makes it hard to access for maintenance.
Innovation Solution
An adjustable protective device that can move away from the protection position to an unlocking position, allowing for easier access and cleaning while maintaining safety by locking into place when operational, utilizing a linkage mechanism and offset spring for automatic return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective device is installed at the protection position to prevent users from being hit by dirt or stones, then safety is improved, but the operating unit becomes difficult to clean when clogged
Solution Approach 1:
The protective device is designed to be movable between a protection position (for safety) and an unlocking position (for cleaning access). The linkage mechanism enables dynamic repositioning of the protective device based on operational needs, allowing it to shift from shielding the operating unit during operation to moving away when cleaning is required.
Solution Approach 2:
A linkage mechanism acts as an intermediary between the protective device and the operating unit, enabling the protective device to move independently for cleaning purposes while maintaining its safety function during operation. The linkage allows the protective device to be decoupled from the operating unit temporarily for maintenance.
2Ease of repair
If the protective device moves away from the protection position to allow cleaning, then ease of cleaning is improved, but safety protection is reduced
Solution Approach 1:
The protective device dynamically repositions between protection and unlocking positions based on operational requirements. During normal operation, it maintains the protection position for safety; during cleaning operations, it moves to the unlocking position to enable access. This dynamic behavior resolves the contradiction by adapting the protective device's position to the current operational context.
Solution Approach 2:
The linkage mechanism is pre-configured to automatically return the protective device to the protection position after cleaning operations. This preliminary action ensures that safety protection is restored without requiring manual intervention, allowing the system to transition smoothly from cleaning mode back to operational mode.
3Reliability
If the protective device is fixed in the protection position, then safety is maintained, but access to the operating unit for cleaning is blocked
Solution Approach 1:
The protective device transitions from a fixed position to a dynamic, movable position. The linkage mechanism enables the protective device to move between the protection position (for safety during operation) and the unlocking position (for cleaning access). This dynamic design allows the system to adapt its configuration based on whether it is in operational mode or cleaning mode.
Solution Approach 2:
The protective device is segmented from the main body of the operating unit through the linkage mechanism, allowing it to move independently. This segmentation enables the protective device to be decoupled from the operating unit temporarily for cleaning purposes while maintaining its safety function during operation, resolving the contradiction between fixed protection and cleaning accessibility.
Data Source
Figure 1
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AI summary
The present description discloses a power tool (10) with an adjustable protective device (90), and comprises a handle (20), a link rod (40) and a head (50). The power tool is equipped with an operating unit (80), for example cutter heads (82), configured to output power for operation, a driving unit (60), configured to drive the operating unit, wherein the driving unit comprises a motor (61), a control unit (30), configured to control the driving unit, wherein the control unit comprises an actuator switch (31) and a control circuit board (35), and a power supply (25), configured to output power to the control unit and the driving unit. The protective device (90) is installed at a locked protection position on the head near the operating unit and is configured such that it can at least partially move away from the protection position to an unlocking position.