Retraction device and pull-out guide
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Solution Overview
Problem
Existing retraction devices for pull-out guides lack sufficient damping forces to slow down the closing movement of rails and have springs that are difficult to replace when damaged.
Innovation Solution
A retraction device with a movable slider pretensioned by a spring, surrounded by a damper with a piston rod, allowing for compact construction and easy spring replacement, using a spiral spring design that takes up minimal space and provides sufficient tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a spring is arranged inside the damper housing, then the construction is compact, but the spring cannot be replaced without removing the damper completely
Solution Approach 1:
The spring is segmented from the damper assembly by being mounted on the slider rather than inside the damper housing. This allows the spring to be independently accessible and replaceable while maintaining the compact overall construction. The spring forms a separate functional module that can be serviced without removing the damper.
2Volume of moving object
If a spring is arranged inside the damper housing, then the construction is compact, but the spring can only provide low tension
Solution Approach 1:
The spring is repositioned from an internal arrangement within the damper housing to an external arrangement around the damper, utilizing the radial dimension. This dimensional change allows the spring to achieve greater tension while maintaining compact construction, as the spring can now extend radially outward rather than being constrained within the housing volume.
3Ease of repair
If the spring is arranged around the damper, then the spring can be easily replaced and provides sufficient tension, but the construction becomes less compact
Solution Approach 1:
The spring and damper are merged into a single integrated assembly where the spring is mounted on the slider and surrounds the damper. This merging allows both components to occupy overlapping spatial volumes, achieving compact construction while maintaining easy spring replaceability and sufficient tension. The slider serves as a common mounting platform for both components.
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 effectively slows down the closing movement of rails, reducing noise and allowing for easy spring replacement, while maintaining a compact design.
Implementation Method 1
a spring (9) is provided, which pretensions the slider (7) in a retracting direction
Implementation Method 2
a damper (8) with a damper housing (80) and a piston rod (81) is provided in order to slow down a relative movement between the slider (7) and the housing (6)
Data Source
AI summary
A retraction device, in particular for pull-out guides, has a housing, in which a guide for a linearly movable slider and a guide track for a driver attached to the slider are provided. The driver can be coupled with an activator and a damper comprising a damper housing and a piston rod is provided between the housing and the slider. There is a pull-out guide with a stationary guide rail and a running rail which is movable relative to the guide rail.