Pivoting Roller Carrier Pull-Out Guide for Heavy Furniture Loads
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Solution Overview
Problem
Conventional pull-out guides for heavy-duty furniture parts face challenges in minimizing space and material usage while maintaining structural integrity under high loads, often leading to bending and potential breakage due to weakened areas in the guide rails.
Innovation Solution
The design incorporates a roller carrier with first and second axle journals that engage in window openings and recesses on the guide rail, providing increased material length and load-bearing capacity, and features convexly curved surfaces to reduce Hertzian pressure and material weakening, along with optional lateral guide rollers for improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the guide rails are made thin-walled to reduce material usage and space, then material consumption and installation space are reduced, but the guide rails become prone to bending and breakage under high loads
Solution Approach 1:
The patent applies local quality by providing reinforcement elements specifically at the window openings and connecting webs where stress concentrates, rather than thickening the entire guide rail. The reinforcement includes extended web sections and additional material localized at critical areas to prevent bending and breakage while keeping the overall structure thin-walled
Solution Approach 2:
The guide rail is segmented into distinct functional zones: thin-walled sections for space efficiency, reinforced window opening areas for load bearing, and strengthened connecting webs for structural integrity. This segmentation allows each part to be optimized for its specific function
2Ease of manufacture
If window openings are formed in both the base web and edge web for pivotable mounting of the roller carrier, then ease of assembly is improved, but the edge web is significantly weakened leading to increased breakage risk
Solution Approach 1:
The patent extracts the window opening from the edge web, providing it only in the base web. The roller carrier is mounted pivotably using a single window opening in the base web, eliminating the need for a second window opening in the edge web that would further weaken it
Solution Approach 2:
The design anticipates the weakening effect of window openings by strategically placing only one window opening in the base web rather than in both webs, thereby preventing the edge web from becoming too weak before actual use
3Ease of operation
If the roller carrier is mounted with axle journals engaging in window openings, then pivotable mounting is achieved, but the material length in critical areas is reduced leading to load-bearing capacity issues
Solution Approach 1:
The patent relocates the window opening to the base web rather than the edge web, changing the spatial dimension where the opening is provided. This allows the roller carrier to pivot while the edge web maintains its full material length and load-bearing capacity
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 allows for efficient accommodation of high loads with reduced material usage and space requirements, minimizing the risk of guide rail breakage and maintaining smooth operation under heavy loads.
Implementation Method 1
rollers are rotatably mounted on a guide rail about axes
Implementation Method 2
roller carrier is mounted pivotably about a pivot axis
Data Source
AI summary
The invention relates to a pull-out guide for pulling out a withdrawable furniture part from a furniture body in a pull-out direction (4, 57), comprising at least a first guide rail (1, 55) and a second guide rail (2, 56), which can be displaced with respect to each other. For the purpose of mutual displacement of the guide rails (1, 2, 55, 56), at least one roller carrier (19) is mounted on the second guide rail (2, 56) such that the roller carrier (19) can pivot about a pivot axis (20, 38, 63), of which roller carrier at least one part is located between the base web (12) and an edge web (14, 17, 61) of the second guide rail (2, 56) and on which at least two running rollers (21, 22) are rotatably mounted. For the pivotable mounting of the roller carrier (19) on the second guide rail (2, 56), the roller carrier (19) has first and second axle pins (26, 27) projecting in opposite directions, of which the first axle pin (26) engages in a window opening (28, 37, 69) formed in the base web (12, 58). The second axle pin (27) of the roller carrier (19) is located on the bottom of a depression (29, 35, 73) in the longitudinal edge (15, 18, 68) of the edge web (14, 17, 61).