Knob assembly and cooking apparatus having same
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Solution Overview
Problem
Existing cooking apparatus knobs, particularly push and turn knobs, pose safety hazards due to accidental operation and are prone to tampering, leading to potential fires or burns, especially when unintentionally pressed or manipulated by users, including children.
Innovation Solution
A knob assembly with an operating button that requires a separate pressing action before rotation, featuring a distinct direction of operation different from the rotational direction, and a simplified structure with minimized parts, including a base portion, driving shaft, knob body, and operating button that moves linearly and rotates independently, with safety pins and elastic members to prevent unintended operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a push and turn knob is used to operate the cooking apparatus, then the safety is improved by requiring both pressing and rotating actions, but the complexity of the device increases due to the protruding knob structure that can be accidentally operated
Solution Approach 1:
The operating mechanism is divided into two independent functional components: a pressing action component (button) and a rotating action component (knob). The button must be pressed first to enable rotation, separating the safety verification step from the operation step. This segmentation prevents accidental rotation while maintaining safety requirements.
Solution Approach 2:
The button-pressing action is required as a preliminary step before the knob can be rotated. This preliminary action verifies user intent and prevents accidental operation. The system requires this preparatory action to be completed before allowing the main operation (rotation) to occur.
2Reliability
If an operating button is added to prevent accidental operation, then the safety is improved, but the number of parts increases
Solution Approach 1:
The button and knob are merged into a single integrated assembly where the button is positioned on the knob body. The button's pressing action directly controls the engagement state of the knob with the drive shaft, combining two control elements into one unified structure that reduces overall part count.
Solution Approach 2:
The button serves multiple functions: it acts as a safety switch to enable/disable rotation, and it also serves as part of the operational interface. The same button structure that prevents accidental operation also initiates the cooking function when pressed, consolidating safety and operation controls.
3Ease of operation
If the operating button moves in a direction different from the axial direction, then the ease of operation is improved by forming a distinct operation direction, but the manufacturing precision requirements increase
Solution Approach 1:
The button is designed to move in a radial direction (perpendicular to the axial direction of the drive shaft) rather than along the axis. This dimensional change creates a distinct motion pattern that is easily distinguishable from rotation, improving ease of operation and preventing accidental activation while maintaining simple manufacturing geometry.
Data Source
AI summary
Disclosed is a knob assembly and a cooking apparatus having it. The knob assembly includes a base portion (110) on a control panel (30) and a driving shaft (71) protruding from it. A knob body (NB) rotates on and linearly moves along the driving shaft (71). The knob body (NB) features an operating button (140) with an exposed operating portion (143) that moves independently of the knob body (NB) in a direction different from the axial direction. The operating button (140) has a first position interfering with the base portion (110), restricting knob body (NB) rotation, and a second position, moved away from the first in a non-axial direction, allowing knob body (NB) rotation. Consequently, the cooking apparatus is operated by rotating the knob body (NB) only after the user presses the operating button (140), preventing unintended operation or errors of the knob assembly.