Pivotable Window Drive Lever Mechanism
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Solution Overview
Problem
Existing window and door drive systems face issues with protruding drives being optically disadvantageous and exposed to weather, limited maximum opening widths due to chain placement, and increased friction and wear with larger openings.
Innovation Solution
The drive is pivotably mounted on a lever, allowing it to lift away from the casement profile, with the axis of rotation positioned at a distance from the drive housing, enabling larger opening angles without chain interference and maintaining a compact, protected design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the drive is mounted outwardly on the sash frame, then sufficient spacing between drive and sash frame is achieved, but the drive becomes visually disadvantageous and exposed to weather
Solution Approach 1:
The drive is nested within the rebate space between the frame and sash frame, utilizing the existing cavity to house the drive mechanism. This eliminates the need for outward mounting while maintaining adequate clearance through the lever's rotational movement that creates dynamic spacing.
Solution Approach 2:
The drive is mounted on a lever that rotates about a pivot axis, creating dynamic positioning. During opening, the lever rotates to lift the drive away from the sash frame profile, maintaining clearance without requiring outward mounting. This dynamic adjustment resolves the contradiction between compact mounting and sufficient spacing.
2Object-affected harmful factors
If the drive is arranged in the rebate between frame and sash frame, then the drive is protected and compact design is achieved, but the chain collides with profile projections limiting maximum opening width
Solution Approach 1:
The lever mechanism dynamically repositions the drive during operation. When the sash opens, the lever rotates about its pivot axis, lifting the drive vertically away from the profile projections. This dynamic clearance prevents chain collision while maintaining the protected rebate mounting, resolving the contradiction between compact protected mounting and maximum opening width.
Solution Approach 2:
Instead of moving the drive horizontally with the sash, the lever mechanism introduces vertical movement as a second dimension. The drive moves in an arc path that includes vertical lift, creating clearance in the vertical direction rather than relying solely on horizontal spacing. This dimensional change allows larger opening angles without chain interference.
3Device complexity
If the chain is located directly adjacent to profile projections in the rebate, then compact design is maintained, but friction due to chain deflection increases wear
Solution Approach 1:
The lever's rotational movement dynamically adjusts the drive's position relative to the chain path. During opening, the lever lifts the drive, creating clearance that reduces chain deflection and friction. This dynamic adjustment maintains compact design while improving chain reliability by minimizing contact with profile projections.
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
This configuration allows for increased opening widths, protects the drive from environmental influences, and ensures a stable connection throughout the opening process, while maintaining a compact and thermally insulated design.
Implementation Method 1
the chain acting against gravity and pivoting the lever away from the sash frame profile
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A drive unit for a window or door sash comprises an electric motor drive (3) that is concealed between a frame (1) and a sash frame (2). The drive (3) is not visible from the outside when the sash is in the closed position, and a pull element (4) can be moved by the drive (3) to open the sash. The drive (3) is pivotally mounted on a lever (8) and lifts itself from a profile of the sash frame (2) when the sash is opened.