Rotating top grip
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Solution Overview
Problem
Existing cleaning device handles with rotatably mounted knobs lack secure attachment methods, leading to potential detachment during use, and existing captive connections are complex and difficult to release.
Innovation Solution
A handle design featuring a knob composed of two elements with a latching mechanism that secures the knob to the handle in a captive and axially fixed manner, allowing for easy release and replacement without tools, utilizing a snap closure and elastic spring tongues for secure attachment and ergonomic design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the knob is not attached to the handle in a captive manner, then the attachment is simple and inexpensive, but the knob could become detached during use
Solution Approach 1:
The knob is divided into two separate elements: a first knob element with a latch and a second knob element with a locking element. This segmentation allows the latch to engage with the handle for secure attachment while keeping the overall structure simple and inexpensive to manufacture.
Solution Approach 2:
The latch is designed to be movable between a locked position (engaging with the handle) and an unlocked position. This dynamic element provides secure attachment during use while allowing easy release when needed, resolving the contradiction between security and simplicity.
2Reliability
If the knob is secured on the handle in a captive manner via snap connection, then the knob is securely attached, but the connection is complex and difficult to release
Solution Approach 1:
By dividing the knob into two elements with distinct functions (latch for engagement, locking element for security), the design achieves captive attachment without requiring a complex integrated snap connection mechanism.
Solution Approach 2:
The locking element automatically engages with the latch to secure the knob to the handle without requiring additional complex components or assembly steps. The system serves itself by using the interaction between these two elements to provide secure attachment.
3Reliability
If the knob is secured on the handle in a captive manner, then the knob cannot become detached during use, but the knob can only be removed from the handle with considerable effort
Solution Approach 1:
The movable latch provides a mechanical advantage that allows the knob to be securely attached during use but easily released when needed. By moving the latch to the unlocked position, the locking element disengages, enabling tool-free removal with minimal effort.
Solution Approach 2:
The release mechanism is designed to be user-actuated through simple movement of the latch, allowing the user to easily remove the knob without requiring tools or excessive force. The system provides its own release mechanism that is simple to operate.
Data Source
AI summary
A handle for a cleaning device, including a knob which is rotatably arranged at one end of the handle, wherein the knob includes a first knob element and a second knob element. The first knob element is connected to the second knob element, and the second knob element has a recess in which the handle is rotatably arranged. The first knob element is equipped with a latch, by which the first knob element is rotatably locked to the handle. The second knob element has a locking element, and the locking element locks the latch of the first knob element relative to the handle when the first knob element and the second knob element are connected to one another.