Drawer Pull-Out Guide with Switching Compensation for Rail Malposition
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Solution Overview
Problem
Drawer pull-out guides often experience malpositions due to incorrect rail positions and running carriage misalignments, leading to drawers getting stuck open, increased friction, and safety hazards, with existing compensation devices causing disturbance and requiring higher spring forces.
Innovation Solution
A switching device that engages the actuating device of the compensation device only when a malposition is present, using a movably-mounted actuating element and abutment portion to correct misalignments during the opening movement, allowing smooth operation without interference when rails are correctly aligned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensation device with continuous engagement is used to correct malpositions, then the reliability of drawer closure is improved, but the friction and noise increase, and the drawer operation becomes more difficult
Solution Approach 1:
The compensation device is designed to act periodically rather than continuously. The actuating element only engages with the abutment portion when a malposition is detected during the opening movement, and disengages when the predefined relative position is achieved. This periodic action eliminates continuous friction and noise while maintaining the ability to correct malpositions when needed, thus improving ease of operation without sacrificing closure reliability.
Solution Approach 2:
The invention extracts the compensation function from continuous operation and activates it only when necessary. The switching device separates the compensation mechanism from the normal drawer operation, allowing the actuating element to be disengaged from the abutment portion during normal smooth operation. This extraction eliminates unnecessary friction and noise while preserving the malposition correction capability when required.
2Reliability
If the actuating device is continuously engaged to compensate for malpositions, then the drawer closure reliability is improved, but the spring force requirement increases
Solution Approach 1:
The compensation device operates periodically only when malpositions occur, rather than requiring continuous engagement. The actuating element engages with the abutment portion only during the opening movement if a malposition is detected, and disengages during normal operation. This reduces the cumulative spring force requirement while maintaining sufficient force for reliable closure, as the spring needs to overcome friction and gravity only during actual compensation events, not continuously.
Solution Approach 2:
The compensation device utilizes the existing opening movement of the drawer to activate the correction mechanism. During the opening movement, the actuating element is naturally actuated by the abutment portion if a malposition exists, allowing the system to self-correct without requiring additional external force. This self-service approach reduces the spring force requirement compared to continuously engaged systems that would need constant force application.
3Reliability
If the compensation device acts during closing movement, then malpositions are corrected, but the closing dynamics are reduced and kinetic energy is insufficient
Solution Approach 1:
The compensation device is designed to act during the opening movement rather than the closing movement. The actuating element engages with the abutment portion during the opening phase when the drawer has sufficient kinetic energy from the initial push, allowing malposition correction without interfering with the controlled closing dynamics. During closing, the actuating element remains disengaged, preserving the smooth closing action and sufficient kinetic energy for reliable latching.
Solution Approach 2:
The compensation for malpositions is performed preliminarily during the opening movement before the closing phase begins. By correcting the rail relative position during opening when energy is abundant, the system ensures that the closing movement proceeds with proper alignment and sufficient kinetic energy, avoiding the problem of insufficient energy that would occur if correction attempted during the later closing phase.
4Reliability
If the actuating element is always in engagement with the abutment portion, then malpositions are continuously corrected, but friction and noise increase
Solution Approach 1:
The actuating element is designed to engage with the abutment portion periodically only when malpositions are detected, rather than maintaining continuous engagement. During normal operation with correct rail alignment, the actuating element remains disengaged, eliminating continuous friction and noise generation. When a malposition occurs during the opening movement, the actuating element automatically engages to correct the position, then disengages once alignment is restored, thus providing reliable correction while minimizing harmful friction and noise.
Solution Approach 2:
The invention extracts the actuating element from continuous contact with the abutment portion and activates it only when necessary for malposition correction. The switching device separates the engagement state based on the presence of malposition, allowing the actuating element to be disengaged during normal operation to eliminate friction and noise, while maintaining the capability to engage and correct malpositions when they occur.
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 correction of malpositions during the opening movement without noticeable manual effort, ensuring smooth drawer operation and reducing the risk of collision, while maintaining low friction and efficient closure dynamics.
Implementation Method 1
at least one running carriage having load-transmitting rolling bodies. The running carriage is displaceably supported between the at least two guide rails
Data Source
AI summary
A drawer pull-out guide includes at least two guide rails displaceably supported relative to one another, and at least one running carriage having load-transmitting rolling bodies. The running carriage is displaceably supported between the at least two guide rails, and the guide rails, upon a movement of the at least one running carriage, adopt a predefined relative position to one another, provided that no malposition of the guide rails to one another is present. A compensation device compensates for a malposition of the guide rails. The compensation device includes an actuating device to be actuated by one of the guide rails, and the actuating device compensates for the malposition upon an actuation. A switching device is provided for switching the actuating device of the compensation device out of engagement with the guide rail if the predefined relative position of the guide rails to another is present.