Pull-Out Guide Crosspiece Layout to Prevent Cage Wedging
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Solution Overview
Problem
Existing pull-out guides for domestic appliances often experience premature displacement of rolling-body cages due to vibrations or improper transport, leading to blockages and high force requirements for operation, especially in extreme environmental conditions like baking ovens and dishwashers, due to wedging effects and lack of lubrication.
Innovation Solution
The design incorporates crosspieces that project into the displacement path of rolling-body cages, positioned close to the rotational axis of the rolling bodies, preventing blockages by minimizing perpendicular force components and ensuring smooth operation with reduced stretching force requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If stops are arranged to press rolling bodies against the track of the opposite rail to define running ranges, then the displacement path is precisely defined, but high sliding friction and high stretching force are produced due to wedging effect
Solution Approach 1:
The stop is segmented into two distinct parts: a first crosspiece that defines the displacement path by contacting the rolling-body cage, and a second crosspiece that limits the displacement path. This segmentation allows the stop to define the running range without pressing the rolling bodies against the rail track, thereby eliminating the wedging effect and reducing stretching force requirements.
2Reliability
If rolling-body cages are displaced due to vibrations or improper transport, then blockages occur and complete opening/closing becomes impossible, but stretching the guide to restore full running range requires high force due to sliding friction
Solution Approach 1:
The stop structure is divided into two crosspieces positioned at different locations. The first crosspiece prevents excessive displacement during transport by limiting the rolling-body cage movement, while the second crosspiece defines the normal operating displacement path. This segmentation prevents blockages without requiring high stretching forces to restore operation.
3Manufacturing precision
If rolling bodies are pressed against the track by stops, then displacement path is limited, but complete blockage occurs under extreme environmental conditions with lack of lubrication
Solution Approach 1:
The stop is designed with two separate crosspieces: the first crosspiece limits displacement by contacting the rolling-body cage without pressing rolling bodies against the track, and the second crosspiece provides additional path limitation. This segmentation ensures displacement control is maintained even under extreme environmental conditions with insufficient lubrication, preventing complete blockage.
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 allows for reliable and effortless retraction of pull-out guides without blockages, even under conditions of low lubrication, by preventing wedging effects and reducing the force needed to return the guides to their original state.
Implementation Method 1
at least one additional rail displaceably mounted relative to the guide rail via a rolling body in a rolling-body cage
Implementation Method 2
The at least one stop projects into the displacement path of one of the rolling-body cage and the rolling body, the rolling body being an outer rolling body. The at least one stop projects up to at least half of the radius of the outer rolling body or up to substantially a rotational axis of the outer rolling body, as seen in a direction of displacement.
Implementation Method 3
Such stops for defining the running ranges of the rails, with respect to each other, are arranged on a rail in such a way that they will press the rolling bodies against the track of the opposite rail and therefore produce a wedging effect. This wedging effect leads to a high level of sliding friction
Data Source
AI summary
A pull-out guide for domestic appliances. The pull-out guide includes a guide rail, at least one additional rail displaceably mounted relative to the guide rail via a rolling body in a rolling-body cage, and at least one stop configured to limit a displacement path of the at least one additional rail. The at least one stop is configured as a first crosspiece and shaped onto one of the guide rail and the at least one additional rail. The at least one stop projects into the displacement path of one of the rolling-body cage and the rolling body. The rolling body is an outer rolling body. The at least one stop projects up to at least half of the radius of the outer rolling body or up to substantially a rotational axis of the outer rolling body, as seen in a direction of displacement.