Rotary Locking Mechanism for Adjustable Handheld Tool Angle Control
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Solution Overview
Problem
Conventional handheld cleaning brushes have a fixed angle between the hand grip and the brushing disc, limiting their effectiveness and user experience due to the inability to adjust the relative positions of these components.
Innovation Solution
A rotary mechanism with a sliding block and rotary drive element allows for adjustable and lockable positioning of the hand grip and brushing disc, enabling stepless adjustment and secure locking through radial movement of the sliding block, facilitated by a rotary cam and flip lock lever, and optionally using inner gear rings and friction or pin-hole fitting for locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hand grip and brushing disc are fixed relative to each other, then the structure is simple and easy to manufacture, but the adaptability and user experience deteriorate due to non-adjustable angle
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed connection between hand grip and brushing disc into a rotatable connection. The rotary mechanism enables the brushing disc to rotate relative to the hand grip, allowing the angle to be dynamically adjusted according to different cleaning needs, thereby improving adaptability while maintaining operational simplicity.
Solution Approach 2:
The patent uses a rotary locking assembly as an intermediary mechanism between the hand grip and brushing disc. This assembly includes a sliding block, rotary drive element, and locking components that mediate the connection, enabling both rotation and secure locking at desired positions. The intermediary mechanism adds minimal complexity while achieving the desired adjustability.
2Adaptability or versatility
If a rotary locking assembly is added to enable adjustment, then the adaptability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The rotary locking assembly is segmented into distinct functional components: a sliding block for radial movement, a rotary drive element for initiating rotation, and locking components (such as teeth or friction elements) for securing positions. This segmentation allows each component to be manufactured independently using standard machining processes, reducing overall manufacturing complexity despite the added functionality.
Solution Approach 2:
The rotary locking assembly incorporates self-locking features where the sliding block, when moved radially by the rotary drive element, automatically engages with locking surfaces or teeth on the mounting portion. This self-service mechanism eliminates the need for additional actuators or complex control systems, simplifying manufacturing while maintaining multi-position adjustment capability.
3Ease of operation
If the sliding block moves radially to lock/unlock, then the operation simplicity improves, but the manufacturing precision requirements worsen due to radial alignment needs
Solution Approach 1:
The rotary locking assembly incorporates built-in alignment features such as guide surfaces, tapered sections, or self-centering mechanisms that automatically align the sliding block with the mounting portion during the locking operation. This beforehand cushioning compensates for minor misalignments, reducing the stringency of manufacturing precision requirements while maintaining smooth operation.
Solution Approach 2:
The locking mechanism utilizes parameter changes in the sliding block's radial position to transition between locked and unlocked states. By designing the locking surfaces with appropriate geometries (such as conical or cam-shaped surfaces), the system tolerates a range of radial positions while maintaining effective locking, thereby reducing the need for extremely tight manufacturing tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the cleaning effect by allowing the brushing disc to conform better to various surfaces, simplifies the structure, and improves user experience through multi-stage or stepless adjustment and secure locking, while reducing manufacturing complexity.
Implementation Method 1
a side surface of the convex rib being formed as a pushing surface for pushing the sliding block
Implementation Method 2
the sliding block and the mounting portion are locked via friction fitting or pin-hole fitting
Data Source
AI summary
A rotary mechanism and a handheld tool, which relates to mechanical regulation. The rotary mechanism including a first part, a second part, and a rotary locking assembly, a mounting portion being provided on the first part, the second part having a rotary portion adapted to the mounting portion; the rotary portion and the mounting portion are rotatably sleeving-fitted, the rotary locking assembly includes a sliding block and a rotary drive element, the sliding block is mounted on the rotary portion, and the rotary drive element rotates to bring the sliding block to move radially along the rotary portion so that the sliding block is locked on the mounting portion or is unlocked from the mounting portion.