Window Opening Limiter Fitting with Profile Rail Guide
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Solution Overview
Problem
Existing opening-limiting fittings for windows and doors are not easily producible, cost-effective, or visually unobtrusive, and they do not reliably manage the opening positions for turn, tilt, or turn-tilt operations, especially for safe ventilation and cleaning positions.
Innovation Solution
The design incorporates a profile rail with a guide channel and a sliding piece that is pivotably connected to the raising rod, featuring a blocking latch that narrows the guide channel in the locked position and releases in the unlocked position, allowing for secure ventilation and easy cleaning by adjusting the opening width, with optional actuation by a key or spring-loaded mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional opening-limiting fitting is used, then the opening position can be limited, but the device is visually disturbing and not cost-effective
Solution Approach 1:
The patent combines the opening-limiting function with the existing longitudinal guide structure of the raising rod mechanism. The blocking latch is integrated into the guide channel, merging the limitation function with the structural element that already exists for guiding the raising rod, thereby eliminating the need for separate visual components and reducing production costs
Solution Approach 2:
The guide channel serves multiple functions: it guides the sliding piece longitudinally, provides structural support, and incorporates the blocking latch mechanism for opening limitation. This multi-functionality reduces the number of separate components needed, making the device more cost-effective and visually integrated
2Reliability
If the blocking latch protrudes into the guide channel to form a stop, then the opening position is reliably limited, but the sliding piece cannot move beyond this position
Solution Approach 1:
The blocking latch is designed to be movable rather than fixed. It can dynamically switch between protruding into the guide channel to limit opening and retracting to allow larger openings, enabling the system to adapt between different operational modes (ventilation vs. cleaning positions)
3Ease of operation
If the sliding piece is freely displaceable in the guide channel, then easy relocation is possible, but the position cannot be securely fixed
Solution Approach 1:
The blocking latch is spring-loaded to automatically protrude into the guide channel and prevent the sliding piece from moving beyond the desired opening position. This preliminary blocking action counteracts any tendency of the sliding piece to move freely, ensuring secure position fixation while maintaining ease of relocation within the allowed range
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 solution provides a cost-effective, visually integrated, and functionally reliable means to limit and adjust the opening of windows and doors, ensuring safe ventilation and easy access for cleaning while preventing unwanted opening due to wind pressure.
Implementation Method 1
a spring-loaded, projecting into the guide channel in the locked state stop member
Implementation Method 2
the guide channel has channel inner walls that keep the slide captive on all sides radially
Implementation Method 3
the blocking device has a blocking latch which, in its blocking position, projects into the guide channel in such a way that it narrows the cross section of the guide channel to form a stop for the slider
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to an opening limiting fitting for a tilt or turn window/door, comprising a pivot rod (8), a pivot bearing (9) and a longitudinal guide (14), wherein one end (12) of the pivot rod (8) is associated with the pivot bearing (9) for attachment to a frame (2) or sash (3) of the window (1) or door and the other end (13) of the pivot rod (8) is associated with the longitudinal guide (14) for attachment to the sash (3) or frame (2), and with a locking device (20) which, in its locked position, enables an opening limiting position and, in its released position, allows an enlarged opening of the sash (3) of the window (1) or door beyond the opening limiting position.It is provided that the longitudinal guide (14) has a profile rail (16) having a guide channel (15) and a sliding piece (7) which is guided axially displaceably in the guide channel (15) and pivotably connected to the other end (13) of the extension rod (8), that the guide channel (15) has channel inner walls (43) which radially retain the sliding piece (7) on all sides, and that the locking device (20) has a locking latch (21) which, in its locking position, projects into the guide channel (15) in such a way that it narrows the cross-section of the guide channel (15) to form a stop (22) for the sliding piece (7), and which, in its release position, releases the cross-section of the guide channel (15) in such a way that it can be traversed by the sliding piece (7).