Extension Guide Self-Closing Assembly With Slide-Rail Driver Mount
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Solution Overview
Problem
Existing self-closing devices for furniture parts guided by pull-out rails have complex and costly assembly processes due to firmly connected housings that require pre-installation of components, making them difficult to install easily and inexpensively.
Innovation Solution
A self-closing device design featuring a housing with a slide rail for easy attachment of the driver, clamping lugs for secure positioning, and damper mounts with beveled surfaces for quick installation, along with lubricant reservoirs to improve operation and noise reduction, allowing for simplified assembly and retrofitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is firmly connected to the guide rail by welding, embossing or riveting, then the connection is strong and reliable, but the assembly process becomes complex and costly
Solution Approach 1:
The self-closing device is divided into separate modular components: the housing, the driver, and the damper. These components can be assembled independently and then connected to each other and to the guide rail through simple plug-in operations, eliminating the need for complex welding or riveting processes while maintaining connection reliability.
Solution Approach 2:
A slide rail acts as an intermediary component between the housing and the driver. The driver can be easily plugged onto the slide rail, which is already attached to the housing, providing a simple and reliable connection mechanism that avoids complex assembly processes.
2Reliability
If the housing encloses the driver from all sides, then the driver is securely protected, but the driver must be installed inside the housing before final assembly, increasing assembly complexity
Solution Approach 1:
The housing is designed with an open structure that allows the driver to be attached externally to the slide rail. The driver and housing remain as separate components that are connected through the slide rail, eliminating the need to enclose the driver within the housing and simplifying the assembly sequence.
Solution Approach 2:
The driver is extracted from the enclosed space within the housing and repositioned to attach externally to the slide rail. This allows the driver to be installed independently before being connected to the housing assembly, reversing the traditional assembly sequence and reducing complexity.
3Ease of manufacture
If injection molded housing is used, then manufacturing is efficient, but the housing must be manufactured around the driver, increasing production complexity
Solution Approach 1:
The housing and driver are manufactured as separate components using independent processes. The housing can be injection molded without incorporating the driver, and the driver can be manufactured separately and then attached to the slide rail, eliminating the need for complex co-molding or pre-assembly operations.
Solution Approach 2:
The slide rail is pre-attached to the housing during housing manufacturing, creating a prepared assembly interface. The driver is then attached to this pre-prepared slide rail in a subsequent simple operation, separating the complex housing manufacturing from the driver installation process.
4Reliability
If traditional damper mounting is used, then the damper is securely fixed, but the installation space required is large and installation time is increased
Solution Approach 1:
The damper is nested within the housing structure, with the damper body positioned inside the housing cavity and only the necessary mounting features extending outward. This nested arrangement secures the damper firmly while minimizing the external space required for installation.
Data Source
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AI summary
An automatic retraction device (1) for a movable furniture part guided by an extension rail, having a housing (2), a force accumulator (4) which is arranged on the housing (2) and can be tensioned during the opening of the movable furniture part, and a tensioning mechanism which is operatively connected to the force accumulator (4) and is intended for pretensioning the force accumulator (4) by means of a carrier (3) arranged displaceably on the housing (2), the housing (2) having a sliding rail (7) on which the carrier (3) can be mounted.