Rotary Hammer Trigger Locking Mechanism for Mode-Specific Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotary hammers lack a reliable mechanism to selectively lock the trigger in the ON position for continuous operation in hammer mode while preventing continuous driving in hammer-drill mode, leading to usability issues and potential tool accessory jamming.
Innovation Solution
A rotary hammer design featuring a locking mechanism that allows the trigger to be locked in the ON position for continuous operation in hammer mode and prohibits continuous driving in hammer-drill mode by using a single locking member that moves between unlocking and locking positions based on the selected mode, ensuring the tool accessory is only driven when manually pressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a locking mechanism is added to allow continuous operation in hammer mode, then usability is improved, but device complexity increases
Solution Approach 1:
The patent combines the mode-switching function and trigger-locking function into a single integrated mechanism. The mode switching member simultaneously controls both the operational mode (hammer/drill) and the trigger locking state, eliminating the need for separate locking mechanisms and reducing overall device complexity while enabling continuous operation in hammer mode
Solution Approach 2:
The mode switching member is designed to perform multiple functions: it switches between hammer mode and drill mode, and simultaneously controls the locking and unlocking of the trigger. This multi-functional design allows continuous operation capability to be added without proportionally increasing device complexity
2Productivity
If the trigger can be locked in ON position for continuous driving, then productivity increases, but risk of tool accessory jamming increases
Solution Approach 1:
The patent implements a preventive mechanism where the mode switching member's structure预先 (in advance) prevents the trigger from being locked in the ON position during drill mode. The interlocking features are designed such that when in drill mode, the trigger cannot engage with the locking member, thereby preventing potential jamming before it can occur
Solution Approach 2:
The mode switching member acts as an intermediary that mediates between the trigger and the locking mechanism. It selectively transmits or blocks the locking action based on the current mode, allowing locking in hammer mode while preventing it in drill mode, thus resolving the conflict between productivity and reliability
3Device complexity
If a single locking member controls both modes, then device complexity is reduced, but control precision over different modes decreases
Solution Approach 1:
The single locking member is designed with segmented or differentiated features that interact differently with the trigger based on mode. The locking member has distinct engagement surfaces or positions that provide precise control for hammer mode while preventing engagement in drill mode, achieving mode-specific precision through structural segmentation rather than multiple separate members
Data Source
AI summary
A rotary hammer includes a motor, a manipulation member, a main switch, a mode-switching member, a first locking member and a second locking member. The first locking member is configured to selectively lock the manipulation member in an OFF position according to a switching position of the mode-switching member. The second locking member is configured to selectively lock the manipulation member in an ON position according to the switching position of the mode-switching member. The first locking member is allowed to lock the manipulation member in the OFF position both when a hammer mode has been selected and when a drill mode has been selected. The motor is allowed to be driven in a state in which the manipulation member is locked in the ON position by the second locking member only when the hammer mode has been selected.