Adjustable door hook assembly
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Solution Overview
Problem
Existing microwave oven door hook assemblies lack efficient adjustment mechanisms, leading to suboptimal engagement with interlock systems, which affects the precision of microwave generation cessation when the door is opened, resulting in unnecessary movement and potential safety hazards.
Innovation Solution
An adjustable door hook assembly with a base, a door hook, and an adjustment assembly that includes an eccentric screw, rack and pinion gear set, or biasing member, allowing for linear translation and precise positioning of the door hook relative to the interlock system, thereby minimizing the distance the door needs to move to disengage the interlock switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed door hook assembly is used, then the structure is simple, but the engagement precision with the interlock system is suboptimal
Solution Approach 1:
The door hook assembly incorporates an adjustment mechanism that allows the door hook to be repositioned along the door panel. This dynamic adjustment capability enables precise engagement with the interlock system while maintaining a relatively simple overall structure. The mechanism transforms a static fixed-position design into an adjustable one, resolving the contradiction between simplicity and precision.
2Manufacturing precision
If the door hook position is fixed, then the assembly process is fast, but the disengagement timing with the interlock switch is imprecise
Solution Approach 1:
The adjustment mechanism allows the door hook position to be pre-configured during assembly to achieve optimal disengagement timing. By performing the positioning action in advance during the assembly process rather than requiring complex real-time control, the system achieves precise disengagement timing while maintaining ease of manufacture.
3Reliability
If the door hook is positioned closer to the interlock system, then the disengagement occurs earlier enhancing safety, but the engagement force increases
Solution Approach 1:
The adjustment mechanism enables precise control of the door hook's position parameter along the door panel. By optimizing this positional parameter, the system achieves earlier disengagement timing for enhanced safety while managing the engagement force within acceptable limits. The continuous adjustability allows fine-tuning of this critical parameter.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A cooking appliance (50) includes an outer housing (52) defining a receiving opening (136) and an interlock system (82) disposed within the outer housing (52) proximate to the interlock system (82). The interlock system (82) includes a rotating cam (86) and an interlock switch (88). A door assembly (58) is operably coupled to the outer housing (52). The door assembly (58) includes an inner panel (74) defining an access aperture (132) and a base (12) operably coupled to the inner panel (74). The base (12) defines an upper opening (14). The door assembly (58) also includes a door hook (16) disposed in the upper opening (14) of the base (16) and an adjustment assembly (26) operably coupled to the door hook (16). The adjustment assembly (26) is configured to linearly translate the door hook (16) relative to the inner panel (74) to adjust a position of the door hook (16). The position of the door hook (16) adjusts an engagement between the door hook (16) and the interlock system (82).