Self-closing slide rail assembly with deceleration mechanism
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Solution Overview
Problem
Existing automatic slide rail retraction mechanisms do not provide a smooth and controlled retraction process, lacking a deceleration mechanism to ensure the second rail is moved to the retracted position both automatically and slowly relative to the first rail.
Innovation Solution
A self-closing mechanism for a slide rail assembly that includes a housing, a movable member, an elastic member, and a deceleration mechanism with a supporting member and a deceleration spring, which counteracts the elastic force applied by the elastic member to slow down the movement of the second rail as it is retracted, utilizing a damping room and friction surfaces for additional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an automatic retraction mechanism is implemented, then the retraction process becomes automatic, but the retraction speed is uncontrollable and too fast
Solution Approach 1:
The deceleration spring is pre-loaded to provide a counteracting elastic force that opposes the main elastic member's retraction force. This preliminary opposing force is calibrated to control the retraction speed, preventing the drawer from snapping shut while maintaining automatic operation. The deceleration mechanism activates before the drawer reaches the closed position, gradually reducing its speed.
Solution Approach 2:
The system changes the force parameter during retraction by introducing a deceleration spring with a specific spring constant. This secondary spring modifies the overall force characteristics of the system, creating a controlled deceleration phase that transitions the drawer from fast automatic retraction to a slower, safer closing speed.
2Force
If only an elastic member is used for retraction, then the retraction force is sufficient, but the retraction process lacks control and smoothness
Solution Approach 1:
The retraction force is segmented into two distinct components: a main elastic member that provides the primary retraction force, and a deceleration spring that provides a secondary counteracting force. This segmentation allows the system to deliver both strong retraction force and controlled smoothness by having each component perform its specialized function at different stages of the retraction process.
Solution Approach 2:
The deceleration spring acts as an intermediary element between the main elastic member and the drawer. It mediates the force transmission by softening the overall retraction action, absorbing excess energy, and providing a cushioning effect that ensures smooth, controlled operation rather than abrupt movement.
3Speed
If a deceleration mechanism is added, then the retraction speed is controlled, but the device complexity increases
Solution Approach 1:
The deceleration mechanism is merged with the existing self-closing slide mechanism by integrating the deceleration spring into the same housing and assembly structure. This combining approach allows the system to achieve speed control without adding a completely separate mechanism, thereby reducing overall complexity while still providing the desired functionality.
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
Enables the second rail to be automatically and slowly moved to the retracted position, providing a controlled and smooth retraction process while maintaining resistance to prevent unintended movement.
Implementation Method 1
an elastic member for applying an elastic force to the movable member in a first direction, wherein when the movable member is engaged with the housing at a predetermined position thereof, the elastic member accumulates the elastic force in the first direction
Implementation Method 2
a deceleration spring for applying to the supporting member an elastic force in a second direction opposite the first direction, wherein the elastic force applied by the deceleration spring is less than the elastic force applied by the elastic member
Implementation Method 3
at least one of the first longitudinal section and the friction portion of the supporting member further includes a friction surface such that, when the supporting member is driven by the movable member, the friction portion of the supporting member is displaced relative to the damping room of the base and resistance is provided by the friction surface
Data Source
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AI summary
A self-closing slide rail assembly with a deceleration mechanism (16) includes first and second rails (10, 12) and a self-closing mechanism (14), in addition to the deceleration mechanism (16). The self-closing mechanism (14) is mounted to the first rail (10) and includes an elastic member (34) for providing an elastic force in a first direction (D1). The deceleration mechanism (16) includes a deceleration spring (66) for providing an elastic force in an opposite second direction (D2). When the second rail (12) is displaced from an extended position toward a retracted position relative to the first rail (10), the self-closing mechanism (14) automatically drives the second rail (12) toward the retracted position due to the elastic force applied by the elastic member (34). Meanwhile, the elastic force of the deceleration spring (66) serves as a deceleration force, allowing the second rail (12) to move slowly to the retracted position.