Roof Window Lifting Device with Sledge Guide
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Solution Overview
Problem
Existing roof window lifting devices lack design flexibility and ease of operability, particularly in accommodating varying roof inclinations, leading to difficulties in opening and closing, especially when equipped with insulating glazing units.
Innovation Solution
A roof window lifting device featuring a sledge guide system with a lifting arm and adjustment arm, where the lifting arm moves translationally within the sledge guide and has a sash wheel connection to the secondary frame, allowing for low-friction movement and adjustable balance according to roof inclination, utilizing a spring assembly and adjustment system for secure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional lifting device is used in roof windows, then the structure is simpler, but the ease of operation deteriorates due to high friction and difficulty in opening/closing
Solution Approach 1:
The lifting device is segmented into multiple functional components: a lifting arm with first and second ends, a sledge with sliding connection to the primary frame, and an adjustment arm. This segmentation allows each component to perform a specific function (lifting, sliding, adjusting) independently, reducing overall friction and improving ease of operation while maintaining manageable complexity
Solution Approach 2:
The lifting arm is designed with dynamic movement capabilities, allowing it to move translationally along the secondary frame while maintaining rotational connection to the sledge. This dynamic configuration enables the lifting arm to adapt its position during opening/closing operations, optimizing the mechanical advantage and reducing friction throughout the range of motion
2Adaptability or versatility
If the lifting arm is rigidly connected to both frames, then the structure is more stable, but the adaptability to different roof inclinations deteriorates
Solution Approach 1:
The adjustment arm provides dynamic adaptability by allowing rotational adjustment between the lifting arm and the sledge guide. This rotational degree of freedom enables the lifting device to adapt to different roof inclinations (15° to 65°) while the sliding connection maintains stability during operation. The system transitions from a rigid fixed-connection design to a dynamically adjustable configuration
Solution Approach 2:
The lifting device utilizes parameter changes through the adjustment arm's rotational capability, which modifies the geometric parameters of the lifting mechanism. By changing the angle and position of the adjustment arm, the device adapts to different roof inclination parameters while maintaining structural stability through the constrained sliding connection of the sledge
3Ease of operation
If a spring assembly is added for force balancing, then the ease of operation improves, but the device complexity increases
Solution Approach 1:
The spring assembly functions as a force-balancing element that counteracts the weight of the movable components (secondary frame and sash). By providing an opposing elastic force, the spring assembly reduces the net force required to open and close the window, significantly improving ease of operation. The spring is integrated into the existing lifting mechanism rather than adding a separate counterweight system
Solution Approach 2:
The spring assembly provides self-service force balancing that automatically compensates for gravitational effects on the movable components. Once installed, the spring continuously provides the necessary counterbalancing force without requiring external intervention or additional energy input, improving ease of operation while adding only one self-contained component to the system
4Reliability
If the second end of the lifting arm is fixed to the secondary frame, then the structural stability improves, but the wear and tear increases
Solution Approach 1:
A roller connection is introduced as an intermediary element between the second end of the lifting arm and the secondary frame. This roller mediator reduces direct friction and contact wear between the lifting arm and frame, allowing the connection to maintain structural stability while significantly extending the service life through reduced wear and tear
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 provides a comfortable, low-friction opening and closing mechanism, minimizes wear, and allows for dynamic use during maintenance, while ensuring balanced operation across a range of roof inclinations from 15° to 65°, facilitating easy installation and adjustment.
Implementation Method 1
a spring assembly configured to be coupled to the sledge
Implementation Method 2
The second end of the lifting arm and the secondary frame may have a roller connection via sash wheel
Implementation Method 3
provides a low-friction opening / closing movement of the roof window
Implementation Method 4
a sledge slidably connected with the primary frame in a sledge guide
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
In the roof window (100), the lifting device (10) further comprises a lifting arm (14) inserted between the primary frame (1) and the at least one secondary frame (2). The lifting arm (14) has a first end (12) rotatably connected with a sledge (30) slidably connected with the primary frame (1) in a sledge guide (16) and a second end (13) rotatably connected with the at least one secondary frame (2). The lifting device (10) further comprises a spring assembly (20) configured to be coupled to the sledge (30).