Oven Pull-Out Rail Locking for Secure Extended Position
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Solution Overview
Problem
Existing pull-out devices for household appliances, such as baking ovens, often experience unintentional travel of sliding rails due to slight inclinations, and their mounting can be complex and costly, particularly with complex spring catch arrangements or require clip-like retaining sections that may not securely fix the pull-out guide.
Innovation Solution
A pull-out device with a side grid and horizontal rods featuring bent end sections, a guide rail fixed by fastening elements, and locking means, including elastically deformable elements or resilient webs, to securely fix the sliding rail in both retracted and extended positions, preventing unintentional travel and simplifying mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex spring catch arrangement is used to fix the sliding rail, then the reliability of preventing unintentional travel is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the essential locking function from the complex spring catch arrangement and implements it through a simplified resilient element that engages with a stop on the guide rail, retaining only the necessary components for preventing unintentional travel while eliminating unnecessary complexity
Solution Approach 2:
The patent replaces expensive, complex spring catch arrangements with simpler, more cost-effective resilient elements that achieve the same locking function through basic elastic deformation, reducing manufacturing costs while maintaining reliability
2Ease of manufacture
If clip-like retaining sections are used to fix the pull-out guide, then the ease of manufacture is improved, but the reliability of securing the guide against unintentional travel deteriorates
Solution Approach 1:
The patent introduces a resilient element that can dynamically adapt to slight inclinations and movements through elastic deformation, allowing the pull-out guide to remain securely fixed even when not perfectly horizontal, while maintaining the simple clip-like mounting structure
Solution Approach 2:
The patent utilizes the elastic properties of the resilient element to change the mechanical parameters of the connection, allowing for slight positional adjustments and inclination compensation while maintaining secure engagement with the guide rail
3Ease of operation
If the pull-out guide is allowed to move freely on the guide rail, then the ease of operation is improved, but the stability of maintaining predetermined position deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by providing locking means that automatically engage to prevent unintentional movement of the sliding rail, while allowing intentional movement when needed, thus maintaining both ease of operation and position stability
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
The solution effectively prevents unintentional sliding rail movement even with slight inclinations, simplifies the mounting process, and ensures secure engagement in predetermined positions, enhancing user handling and reducing manufacturing costs.
Implementation Method 1
a resilient web, for example, is provided as locking means, which is fixed on the sliding rail and in the event of a movement of the sliding rail, can be engaged both with a front vertical post and with a rear vertical post of the side grid
Implementation Method 2
an element in the form of a locking projection can, within the scope of the present disclosure, be provided as locking means which projects from the sliding rail of a pull-out guide in the direction of the post of a side grid in order to produce a frictional contact between the respective post and the sliding rail in the locking zones
Data Source
AI summary
A pull-out device for a household appliance The pull-out device includes a side grid configured to be installed in an interior space of the household appliance and a plurality of horizontal rods each having a bent end section on opposite sides of the rod, the bent end sections being fixed on a vertical post of the side grid. Also included is a guide rail fixed on at least one of the rods by a fastening element and locking means configured to detachably fix a sliding rail that is movably supported on the guide rail in one or both of a retracted and an extended position.