Pullout Guide Locking Mechanism for Defined Sequence Control
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Solution Overview
Problem
Existing pullout guides for domestic appliances and furniture lack defined sequence control and high functional reliability, particularly when multiple rails are involved, leading to vague catch forces and annoying intermediate position latching during extension or retraction.
Innovation Solution
A pullout guide with a pre-tensioned locking mechanism, featuring a locking element that can be fixed on one of the rails in a friction-locked or form-fitting manner, and an unlocking element on the third rail to ensure precise control and high reliability, allowing for easy disengagement with minimal force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catch means with spring elements are used to latch the slide rail, then latching in one or more positions is possible, but the catch forces can only be vaguely determined and sequence control cannot be implemented
Solution Approach 1:
The patent replaces the conventional spring-based catch mechanism with a locking mechanism that uses a locking element and unlocking element. This substitution provides defined sequence control and high functional reliability by ensuring that the locking element cannot be disengaged without the specific unlocking element, preventing vague catch forces and enabling precise control over when rails are moved.
Solution Approach 2:
The patent introduces a locking element as an intermediary component between the rails that provides defined sequence control. The locking element acts as a mediator that must be specifically unlocked to allow rail movement, enabling precise control over the sequence of operations and eliminating the ambiguity of conventional catch mechanisms.
2Reliability
If two catch means are provided for full pullout with three rails, then latching is possible, but one of the two catch means must be disengaged to move the slide rail, making sequence control impossible
Solution Approach 1:
The patent replaces the complex system of multiple catch means with a simplified locking mechanism comprising a locking element and unlocking element. This substitution reduces device complexity by eliminating the need for multiple independent catch means while maintaining reliable latching function and enabling clear sequence control through the single locking/unlocking pair.
3Manufacturing precision
If latching in intermediate position is required during retraction or extension, then position control is possible, but the latching is perceived as annoying during continuous movement
Solution Approach 1:
The patent applies dynamics by making the locking element movable rather than fixed. The locking element can be pre-tensioned in a springy manner and moved between locked and unlocked states, allowing the system to dynamically adapt between providing position control when needed and enabling continuous movement when the locking element is disengaged, thus eliminating the annoyance of intermediate latching during continuous operation.
4Reliability
If a locking element with pre-tension is used, then defined sequence control and high functional reliability are achieved, but the construction becomes more complex
Solution Approach 1:
The patent merges the locking element and unlocking element into an integrated system where the unlocking element is preferably provided on the third rail and moves together with it. This merging reduces the number of separate components and simplifies the overall construction while maintaining the high functional reliability provided by the pre-tensioned locking mechanism.
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 provides a defined sequence control and high functional reliability by ensuring that the locking mechanism can be reliably engaged and disengaged, preventing incorrect actuations and maintaining functionality over extended use.
Implementation Method 1
a locking element (42, 74, 82), which is pre-tensioned in a springy manner in the locking position
Implementation Method 2
The fixing can be performed in a friction-locked, form-fitting, or integrally-joined manner on the respective rail
Data Source
AI summary
A pullout guide for domestic appliances or furniture has a first rail, a second rail and a third rail mounted to be movable in relation to one another. The third rail is fixed on a body and the first rail is connected to a thrust element. A locking mechanism is provided to lock the first rail against movement in relation to the second rail in a predetermined locking position. The locking mechanism has a locking element that is pre-tensioned in a springy manner in the predetermined locking position.