Sliding Door Fitting Assembly with Transverse Spring Pretensioning
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Solution Overview
Problem
Existing fitting arrangements for lift-sliding doors and windows face challenges with larger manufacturing tolerances, which can lead to reduced guidance quality and increased friction, making them difficult to manufacture and assemble efficiently.
Innovation Solution
A compact fitting arrangement featuring an elongated guide rail with two opposing guide surfaces and contact elements, a pretensioning device that preloads the contact elements transversely to maintain constant guide contact, and a linear guide that allows the contact unit to move perpendicular to the guide surfaces, compensating for manufacturing tolerances and wear, while maintaining low friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If larger tolerances are used in manufacturing guide surfaces and contact elements, then manufacturing cost and ease of manufacture improve, but guidance quality and friction characteristics deteriorate
Solution Approach 1:
The invention introduces a pretensioning device that actively adjusts the contact force between contact elements and guide surfaces. By changing the force parameter through spring pretensioning, the system compensates for dimensional variations caused by larger manufacturing tolerances, maintaining consistent guidance quality despite varied contact pressures
Solution Approach 2:
The pretensioning device with spring element automatically compensates for wear and tolerance variations without external intervention. As wear occurs or tolerances vary, the spring maintains constant pretension force, allowing the system to self-regulate and maintain guidance quality throughout its service life
2Ease of manufacture
If larger tolerances are used in manufacturing guide surfaces and contact elements, then manufacturing cost and ease of manufacture improve, but friction characteristics deteriorate
Solution Approach 1:
The pretensioning device maintains optimal contact force between contact elements and guide surfaces. By controlling the normal force through spring pretensioning, the system ensures consistent friction characteristics that are neither too high (causing sticking) nor too low (causing wear), despite variations in dimensional tolerances
3Device complexity
If contact elements are made stationary, then device complexity is reduced, but ability to compensate for tolerances and wear is lost
Solution Approach 1:
The contact elements are designed with translational movement capability along the guide surfaces, allowing them to dynamically adjust their position. This dynamic adjustment, combined with spring pretensioning, enables automatic compensation for manufacturing tolerances and wear while maintaining simple overall device structure
Solution Approach 2:
The contact unit is divided into separate contact elements that can move independently along the guide surfaces. This segmentation allows each contact element to independently compensate for local variations and wear, providing tolerance compensation without requiring complex integrated mechanisms
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 solution allows for higher manufacturing tolerances without compromising guidance quality, ensuring consistent frictional force and easy assembly, even with larger tolerances, and reduces friction through rotatable contact elements and a spring-based pretensioning device.
Implementation Method 1
the pretensioning device can, for example, comprise a spring element (in particular a compression spring)
Implementation Method 2
a pretensioning device is provided by means of which the contact elements can each be pretensioned transversely to the longitudinal extent of the guide rail against the guide surface assigned to the respective contact element
Implementation Method 3
at least one of the contact elements, preferably each of the contact elements, can be rotatably coupled to the contact unit. This reduces the friction between the contact elements and the guide surfaces to rolling friction
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a fitting assembly (10) for sliding doors, sliding windows, or the like, having an elongated guide rail (12), designed for fastening to a stationary wall, and a contact unit (16) guided in the guide rail (12). There are two guide surfaces (26, 28), aligned opposite relative to each other, and two contact elements (22, 24) on the contact unit (16), aligned opposite relative to each other. One of the contact elements (22) is designed for guided contact on one of the guide surfaces (26) and the other contact element (24) is designed for guided contact on the other guide surface (28), in order to guide the contact unit (16) in the guide rail (12). According to the invention, there is furthermore a pre-tension device (30), such as in the form of a spring, by means of which the contact elements (22, 24) can be pre-tensioned crosswise to the longitudinal extension of the guide rail (12) against the guide surface (26, 28) associated with the respective contact element (22 and 24).