Sliding Sash Shifting Mechanism With Cam-Guided Anti-Jamming Locking
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Solution Overview
Problem
Existing displacement devices for sliding sashes in windows and doors suffer from structural complexity, high cost, and operational issues such as torque-induced jamming and tilting, particularly when dealing with high loads, and require significant installation space.
Innovation Solution
A compact, cost-effective displacement device with a locking mechanism that can be mounted on both horizontal and vertical sash members, utilizing a control cam and control tab system to guide the sash into closed and open positions relative to the frame, with integrated locking elements for secure closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If roller pairs with narrow central section and wedge-shaped surfaces are used to move the sliding sash perpendicular to the frame, then the sash can be shifted against the frame, but torque is introduced into the bolt causing it to tilt and jam
Solution Approach 1:
The device is divided into separate functional components: a control element with control cam for guiding movement, and a separate actuating linkage for force transmission. This segmentation allows the control cam to handle the perpendicular shifting motion without introducing torque to the locking bolt, while the actuating linkage independently manages the locking function.
Solution Approach 2:
A control cam acts as an intermediary element between the actuating mechanism and the sash. The control cam converts the actuating motion into perpendicular sash movement through its cam profile, mediating the force transmission to avoid direct torque application to the locking bolt while achieving the desired sash displacement.
2Strength
If multiple roller pairs are used to handle high loads, then the device can support heavier sashes, but the structure becomes more complex and requires more installation space
Solution Approach 1:
The traditional mechanical roller bearing system is replaced with a control cam and actuating linkage mechanism. The control cam's cam profile provides the necessary mechanical advantage and force multiplication to handle high loads without requiring multiple roller pairs, thereby reducing structural complexity while maintaining or increasing load capacity.
3Reliability
If a slot-like receptacle design is used for the locking element, then the locking piece can engage the locking element, but the design is complex to manufacture and tolerances cause the locking piece to tilt and jam
Solution Approach 1:
Instead of using a slot-like receptacle that requires precise tolerance control, the design inverts the approach by using a control cam with a cam profile that guides the locking element's movement. The cam profile inherently compensates for tolerances through its geometric design, allowing reliable locking engagement without complex manufacturing requirements.
4Ease of operation
If the displacement device is mounted on the sash with actuating mechanism, then the sash can be forcibly moved into closed and open positions, but the device requires significant installation space
Solution Approach 1:
The control element and actuating linkage are designed to be compact and nestable within the existing window or door frame structure. The control cam can be mounted on existing surfaces, and the actuating linkage folds or nests when not in use, minimizing the installation space required while maintaining the forced sash movement capability.
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 reliable, efficient, and aesthetically pleasing operation with minimal installation space, allowing for easy mounting, adjustment, and secure locking without additional components, reducing friction and noise, and accommodating various window or door sizes and weights.
Implementation Method 1
A displacement device (1) for forcibly moving a sash (2), in particular a sliding sash, of a window or door (4) relative to a frame (3)
Implementation Method 2
at least one locking element (46) which, together with a locking element (24) arranged on the frame (3), forms a locking device (42)
Data Source
Figure 1
Figure 2~4
Figure 5~8
AI summary
The invention relates to a shifting device (1) for the forced shifting of a leaf (2), a sliding leaf, of a window or a door (4) relative to a frame (3) of the window or the door (4) in a transverse, in particular perpendicular, direction to the main plane of the window or the door (4), comprising an actuation mechanism (5) which can be arranged on the leaf (2) and which is moveably connected to an actuation rod (7) of the shifting device (1) using a section in the hinge peripheral direction (6). As well as comprising a control element (8) of a control plate (9) on the actuation rod (7) of the shifting device (1), and a control cam (11) or pin, wherein the control plate (9) has a control contour (12) which cooperates with the rod of the actuation mechanism (5) together with a control bolt (13) arranged on the actuation rod (7) of the shifting device (1).