One-Handed Power Tool Reversing Linkage Mechanism
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Solution Overview
Problem
Conventional ratchet wrenches require users to move their hand away from the manipulating position and use their other hand to switch the control member, making it difficult to change the rotation direction efficiently, especially in narrow or hard-to-reach areas, and often result in contamination and reduced usability due to the need for two-handed operation.
Innovation Solution
A power tool with a reversing assembly positioned near the grip part allows for direct switching of the rotation direction with one hand, eliminating the need to move the tool or change hand positions, and features a design that keeps the reversing assembly away from the driving device to prevent unintentional contact and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control member is positioned close to the ratchet structure for compact design, then the device complexity is reduced, but the ease of operation deteriorates as the user must move their hand away from the manipulating position to switch directions
Solution Approach 1:
A linkage mechanism serves as an intermediary between the control member near the ratchet structure and the user's hand at the handle. This linkage transmits the switching action from the distant control member to the user's convenient hand position, resolving the contradiction between compact structure and ease of operation
Solution Approach 2:
The control member is positioned in a different spatial dimension (near the ratchet structure) while the user interacts with it through a linkage from another dimension (the handle). This dimensional separation allows the control member to be compact while remaining accessible to the user's hand movement
2Ease of operation
If the lever is positioned away from the handle for better ergonomics, then the ease of operation improves, but the device complexity increases due to longer linkage requirements
Solution Approach 1:
The linkage mechanism is nested within the existing structural space of the ratchet wrench, utilizing available voids and channels rather than adding external extensions. This allows the linkage to reach from the handle to the control member without significantly increasing the overall device complexity or length
3Reliability
If the control member requires two-handed operation for direction switching, then the reliability of switching action improves, but the productivity deteriorates as the user cannot maintain tool position while switching
Solution Approach 1:
The linkage mechanism is designed to be actuated by the user's existing hand movement when gripping the handle, rather than requiring a separate hand. The gripping action itself provides the force to operate the control member, making the system self-servicing and eliminating the need for two-handed operation
4Device complexity
If the reversing assembly is positioned close to the driving device for compact design, then the device complexity is reduced, but the reliability deteriorates due to risk of unintentional contact and contamination
Solution Approach 1:
The reversing assembly is extracted from the immediate vicinity of the driving device and positioned at a distance through the linkage mechanism. This spatial separation prevents unintentional contact with the driving device while maintaining functional connection, thus improving reliability without significantly increasing overall device complexity
Data Source
AI summary
The invention relates to a power tool that can be held with one hand for reversing, comprising: a casing having a grip part and a manipulation port; a driving device having a control member; the control member is capable of controlling an actuation direction of the driving device; a power source disposed below the driving device and capable of driving the driving device; a reversing assembly disposed at a periphery of the power source and having a reversing member; the reversing member controls the control member to generate changes of displacement, a driving direction of the driving device is changed by action of turning the reversing assembly that is away from the driving device, and there is an appropriate manipulating distance between the grip part and the manipulation port, so that a user is capable of manipulating by holding and reversing the power tool with one hand at a same position, and the control member is capable of being driven to perform reversing when the driving device is driven.