Adjustable Gas-Strut Screen Lift for Variable Screen Weights
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Solution Overview
Problem
Existing screen extension devices require replacement of actuators with fixed power when screen configurations change, leading to significant costs due to their inflexibility and inability to adapt to varying screen weights.
Innovation Solution
A device that uses an adjustable actuator system and a gas strut to independently move a screen between retracted and working positions, allowing for adaptation to different screen models without the need for additional actuators, featuring a flexible connection and an elastically deformable element to reduce friction and stress, and facilitate maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an actuator with fixed power is used to determine the force of expulsion of the screen, then the device is simple in structure, but it cannot adapt to different screen configurations and weights
Solution Approach 1:
The patent applies the dynamics principle by making the actuator system adjustable rather than fixed. The actuator can be repositioned along the movable arm to different locations, changing its lever arm length and thus the mechanical advantage. This dynamic reconfiguration allows the same actuator to provide different expulsion forces for screens of varying weights and configurations, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The patent implements parameter changes by allowing the actuator position parameter to be varied. By changing the position of the actuator attachment point on the movable arm, the system changes the effective lever arm length, which directly affects the force multiplication ratio. This parameter adjustment enables adaptation to different screen weights without replacing the actuator, maintaining structural simplicity while achieving versatility.
2Reliability
If a rigid connection is used between the movable arm and screen support, then the structure is stable, but friction and stresses increase and maintenance becomes difficult
Solution Approach 1:
The patent applies this principle by using a flexible belt instead of a rigid mechanical connection between the movable arm and screen support. The belt provides a flexible yet reliable connection that reduces friction and stress concentrations at connection points. This flexible connection maintains the necessary mechanical coupling while eliminating the need for complex lubrication and adjustment mechanisms, thereby improving reliability and ease of maintenance simultaneously.
3Adaptability or versatility
If additional actuators are used to control the jack force, then the lifting capacity can be adjusted, but the device complexity increases and maintenance becomes more difficult
Solution Approach 1:
The patent applies universality by designing a single actuator that can perform multiple functions through repositioning. The same actuator can be moved to different positions along the movable arm to handle different screen weights and configurations. This eliminates the need for multiple actuators with different power ratings, reducing device complexity while maintaining full adaptability to various lifting requirements.
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 enables easy adaptation to various screen configurations, reduces operational noise, and simplifies maintenance by eliminating the need for lubrication and additional actuators, ensuring the device can handle a range of screen weights without replacement, thus optimizing lifting capacity and reducing costs.
Implementation Method 1
The movement of the screen between the retracted position and the working position is ensured by the actuator independently. The cylinder also makes it possible to dampen the movement of the screen independently.
Implementation Method 2
The limited spacing can be obtained by limiting the spacing by the action of an elastically deformable element. These arrangements according to the invention allow a reduction in the friction and stresses of the displacement device.
Data Source
Figure 1a~1b
Figure 2~3
Figure 4a~4b
AI summary
The present invention relates to a device for moving a screen (5) between a first position called "retracted" and a second position called "working" relative to a frame (3) or a part of a piece of furniture comprising: - a screen support (9) onto which said screen (5) is intended to be mounted; - a guide (11) for the movement of said screen (5) mounted on said screen support (9) relative to said frame (3), capable of guiding said screen (5) between said retracted position in a housing (7) of said frame (3) and said working position; - a movable arm (13) connected on one side, at a first end, to said frame (3) by a first rigid connection (15); and on the other side, at a second end, to said screen support (9) by a second connection (17); - a jack (19) connected on one side to said frame (3) by a third rigid connection (29); and on the other hand said movable arm (13) by a fourth rigid connection (22);- an adjustment system (21) for the positioning of said fourth link (22) between a first adjustment position (25) and a second adjustment position (27) along said movable arm (13), so as to adapt the moment induced on said second link (17) by the action of said cylinder (19) to the moment induced by the weight of said screen (5) on said second link (17).;