Appliance Door Hinge Assembly With Preloaded Spring and Link Rod
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Solution Overview
Problem
The assembly of hinges for electrical household appliance doors is complex and costly due to the need for preloading and inserting elastic elements, which complicates the process and increases costs.
Innovation Solution
The design incorporates a hinge with a link rod and a second hinge without elastic means, utilizing a pre-compressed helical spring and a cam mechanism to simplify assembly and ensure efficient operation, with the link rod providing a limit stop action to maintain safety and operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic elements are inserted into hinge components in a preloaded condition, then the hinge operates effectively, but the assembly process becomes complex and costly
Solution Approach 1:
The elastic element is pre-loaded within the first hinge component during manufacturing, so that when the second component is attached, the elastic element is already in its functional preloaded state. This eliminates the need for complex preloading operations during final assembly, reducing assembly complexity while maintaining effective hinge operation.
Solution Approach 2:
The elastic element is nested within the first hinge component's housing or cavity, allowing it to be pre-installed and pre-loaded before the second component is attached. This nesting approach simplifies the overall assembly process by consolidating the elastic element installation into the component manufacturing stage rather than requiring separate assembly steps.
2Ease of operation
If two separate hinges are used to connect the door to the oven structure, then the door can tilt open effectively, but the assembly process becomes more time-consuming
Solution Approach 1:
The invention combines two separate hinge components into a single integrated hinge assembly where the first and second components are permanently attached to each other. This merged hinge maintains the door's tilting capability while reducing the number of separate assembly operations required, thereby increasing assembly speed and productivity.
Solution Approach 2:
The integrated hinge assembly performs multiple functions simultaneously: it provides the mechanical connection for door attachment, enables tilting motion, and incorporates the elastic element for controlled operation. This multi-functional design eliminates the need for separate components and assembly steps, improving both operation effectiveness and assembly efficiency.
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 design simplifies the assembly process, reduces costs, and maintains operational efficiency while ensuring safety compliance by eliminating the need for complex spring preloading in one hinge type and utilizing a shared structure for both hinges, achieving effective door operation and compliance with safety regulations.
Implementation Method 1
a first helical spring (13) fitted round the outside of the stem (12) and stressed by compression... the spring (13) constitutes for the hinge (40) elastic means designed to generate a reaction force that opposes the opening movement of the door (3)
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A door or wing for electrical household appliances comprises a pivoting element (30) and two hinges (40, 50) mounted along one perimetric side of the pivoting element (30) to join the pivoting element (30) to a frame (2) and make it movable relative to the latter between a closed position and an open position, each of the two hinges (40, 50) comprising a first member and a second, box-shaped member and a lever for connecting the first and second members. [Figure 1]