Cooking Rack Guide Rail Fixing With Non-Circular Struts
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Solution Overview
Problem
Existing guide devices for cooking racks, which use cylindrical rods, suffer from instability due to rotational and torsional movements caused by holders that can rotate around the axis of the rod, leading to inadequate fixation of the pull-out guide to the side grid.
Innovation Solution
A guide device with a stationary rail fixed to a strut via at least two holders, where the strut has a non-circular cross-section, such as rectangular or oval, and holders have flat contact surfaces to prevent rotation, with optional U- or L-shaped engagement to secure against tilting and horizontal movement, using bent steel or sheet metal for holders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical rod is used for the strut, then the holder can be easily manufactured and installed, but the holder can rotate around the axis of the rod causing bending or torsional movements
Solution Approach 1:
The patent applies asymmetry by changing the strut's cross-section from a circular shape to a non-circular shape (rectangular, square, or oval). This asymmetric geometry prevents the holder from rotating around the strut axis, as the flat contact surface of the holder can only engage with specific flat surfaces of the non-circular strut, thereby eliminating rotational instability while maintaining manufacturing feasibility.
2Stability of the object's composition
If a flat contact surface is used on the holder, then rotation around the longitudinal axis is prevented, but the device complexity increases
Solution Approach 1:
The patent applies local quality by providing flat contact surfaces only at the specific locations where holders engage with the strut, rather than changing the entire structure. The flat contact surfaces are localized to the contact areas between the holder and the non-circular strut, allowing rotation prevention without significantly increasing overall device complexity.
3Force
If the vertical extension of the strut is increased to at least 40% of the fixed rail, then higher weight forces can be absorbed, but the length of the stationary object increases
Solution Approach 1:
The patent applies parameter changes by optimizing the vertical extension dimension of the non-circular strut to be at least 40% of the fixed rail length. This specific dimensional parameter allows the strut to absorb higher weight forces while controlling the overall length increase, balancing load-bearing capacity with compact design.
Data Source
AI summary
A guide device for a cooking rack comprises a side grid and a pull-out guide with rails movable relative to one another, wherein a stationary rail can be fixed to a strut of the side grid via at least two holders, wherein at least the strut to which the at least two holders are fixed has a cross-section deviating from the circular shape, and at least one holder has a contact surface which lies flat against the strut. In this way, the pull-out guide can be firmly fixed to the strut.