Slide Rail Deceleration Assembly Using Friction Stop Engagement
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Solution Overview
Problem
Conventional slide assemblies lack a deceleration device, resulting in impact noise and reduced reliability due to the absence of a mechanism to slow down the rail's speed when reaching its fully extended position.
Innovation Solution
A slide assembly with a deceleration device comprising a stop member and a friction member, where the friction member's extension portion contacts a stop plate to generate friction, reducing the rail's speed and providing a resistance effect to indicate full extension, comprising a guide face, multiple extension portions, and a resilient member to maintain engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rail is pulled to the fully extended position without a deceleration device, then the positioning function is achieved, but impact noise and reduced reliability occur
Solution Approach 1:
The friction member is positioned to contact the stop plate before the rail reaches its fully extended position, creating a deceleration zone that gradually reduces the rail's speed. This beforehand cushioning prevents sudden impact by dissipating kinetic energy through friction, thereby reducing impact noise and protecting the positioning device from shock loads.
Solution Approach 2:
The friction member acts as an intermediary element between the moving rail and the stop member. Instead of the rail directly impacting the stop member, the friction member mediates the interaction by providing controlled frictional resistance, thereby reducing impact forces and noise while maintaining the positioning function.
2Reliability
If a deceleration device is added to reduce rail speed, then impact noise and reliability are improved, but device complexity increases
Solution Approach 1:
The deceleration function is merged with the existing positioning structure by integrating the friction member and stop member into the rail assembly. The friction member utilizes the existing stop plate geometry, and both components work together within the same structural space, thereby adding deceleration capability without proportionally increasing overall device complexity.
Solution Approach 2:
The friction member is designed to be self-actuating, utilizing the natural motion of the rail and the geometry of the guide face to automatically engage and disengage from the stop plate. This self-service mechanism eliminates the need for external actuators, sensors, or control systems, thereby minimizing the increase in device complexity while achieving reliable deceleration.
3Speed
If the friction member continuously contacts the stop plate, then deceleration is maintained, but excessive friction and wear occur
Solution Approach 1:
The friction member engages with the stop plate periodically rather than continuously. The guide face geometry ensures that frictional contact occurs primarily during the deceleration phase when the rail approaches full extension, and the friction member disengages when the rail is fully extended or retracted. This periodic action provides necessary deceleration while minimizing unnecessary frictional energy loss during other phases of operation.
Solution Approach 2:
The friction member is designed with dynamic characteristics that allow it to adapt its contact pressure and engagement duration based on the rail's velocity and position. As the rail slows down, the friction member naturally reduces its contact pressure, optimizing the balance between maintaining deceleration effectiveness and minimizing energy loss through friction.
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 deceleration device effectively reduces the impact force and noise by slowing down the rail's speed at full extension, enhancing the reliability and user awareness of the rail's position, while allowing for flexible mounting on different slide assembly configurations.
Implementation Method 1
the extension portion of the friction member is slidably and flexibly in contact with the stop plate of the stop member so as to provide a friction between the friction member and the stop member
Data Source
AI summary
A slide assembly includes a first rail, a second rail, a stop member and a friction member. The first rail includes two sidewalls with a connection wall connected therebetween. The second rail is slidably located between the two sidewalls of the first rail. The stop member is fixed to the connection wall and has a stop plate which is perpendicular to the connection wall. The friction member is fixed to the second rail and has an extension portion. The extension portion has a guide face. When the second rail is moved relative to the first rail after the friction member touches the stop plate and overlaps the stop member by the guide face, the friction member is slidably and flexibly in contact with the stop plate.