Knob Assembly Hook Support for Stable Low-Friction Rotation
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Solution Overview
Problem
In knob assemblies, gaps between the shaft and holder can cause the knob to shake, leading to unclear input transmission and a deteriorated user experience, while contact areas generate friction, interfering with the rotation or movement of the knob.
Innovation Solution
A holder with hooks adjacent to the edge of the opening, protruding from the first surface in the direction of the shaft, supports the shaft by contacting its outer circumferential surface, minimizing friction and stabilizing the shaft, thus smoothing knob manipulation and reducing shaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is provided between the shaft and holder to enable rotation, then the knob can rotate freely, but the knob shakes and input transmission becomes unclear
Solution Approach 1:
A knob body is introduced as an intermediary component between the shaft and holder. The knob body has an inner circumferential surface that contacts the shaft's outer circumferential surface, while the holder's opening contacts the knob body's outer circumferential surface. This intermediary structure transmits rotational input clearly from the shaft to the holder without shaking, as the knob body mediates the connection and ensures stable signal transmission.
2Stability of the object's composition
If a contact area is provided between the shaft and holder to fix the shaft, then the shaft is stably supported, but friction interferes with rotation or movement of the knob
Solution Approach 1:
The contact interface is segmented into two distinct stages: first, the shaft's outer circumferential surface contacts the knob body's inner circumferential surface; second, the knob body's outer circumferential surface contacts the holder's opening. This segmentation allows the shaft to be stably supported during rotation while minimizing direct friction between the shaft and holder, as the knob body acts as a low-friction intermediary in the contact chain.
Data Source
AI summary
A knob assembly includes a holder including a first surface, a second surface that is opposite to the first surface, and an opening penetrating from the first surface to the second surface, a shaft disposed in the opening, and a knob facing the first surface of the holder and connected to the shaft, wherein the holder includes a hook that is adjacent to an edge of the opening, protrudes from the first surface in a direction of the shaft, and supports the shaft by contacting an outer circumferential surface of the shaft. In addition, various embodiments may be possible.