Rotary Hammer Mode Dial Protected by Grip Nesting
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Solution Overview
Problem
Power tools with rotary hammer mechanisms face the challenge of protecting the mode change dial from damage due to external impacts, such as drops, which can lead to operational failures.
Innovation Solution
The power tool incorporates a first operation member positioned on the tool body and facing the grip part, allowing for manual mode changes without exposing the mode change mechanism to collision risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mode change dial is arranged in the upper end portion of the housing, then it is easily accessible for operation, but it is vulnerable to damage from external impacts such as drops
Solution Approach 1:
The patent inverts the conventional arrangement by moving the mode change dial from the upper end of the housing to the lower end, facing the grip part. This inversion protects the dial from damage during drops while maintaining operational accessibility through the grip area.
Solution Approach 2:
The grip part serves as an intermediary structure that houses the mode change dial within its hollow portion. This intermediary arrangement allows the dial to be accessible during normal operation while being protected from external impacts during accidental drops.
2Ease of operation
If the mode change dial is positioned on the upper housing, then it is visible and easy to reach, but it collides with walls or ground during accidental drops
Solution Approach 1:
The patent inverts the conventional arrangement by moving the mode change dial from the upper end of the housing to the lower end, facing the grip part. This inversion protects the dial from damage during drops while maintaining operational accessibility through the grip area.
Solution Approach 2:
The patent applies preliminary protective action by positioning the mode change dial in a location that is inherently protected from collision during drops. The dial is placed within the grip part's hollow portion, pre-shielding it from harmful external impacts before they can occur.
3Reliability
If the operation member is placed on the tool body facing the grip part, then it is protected from impact damage, but it may reduce accessibility for mode selection
Solution Approach 1:
The grip part serves as an intermediary structure that houses the mode change dial within its hollow portion. This intermediary arrangement allows the dial to be accessible during normal operation while being protected from external impacts during accidental drops.
Solution Approach 2:
The mode change dial is nested within the hollow portion of the grip part, creating a protected internal space. This nesting arrangement shields the operation member from external impacts while maintaining accessibility through the grip structure.
Data Source
AI summary
A power tool having a rotary hammer mechanism has a motor, a driving mechanism, a tool body that houses the motor and the driving mechanism, a handle having a grip part, and a first operation member. The driving mechanism is configured to operate by power of the motor in an action mode that is selected from a plurality of operation modes including a first mode of at least rotationally driving a tool accessory around a driving axis and a second mode of only linearly driving the tool accessory along the driving axis. The grip part extends in a direction crossing the driving axis and is configured to be held by a user. The first operation member is on the tool body and faces the grip part. The first operation member is configured to be manually operated by the user to change the action mode of the driving mechanism.