Louver Locking Mechanism with Self-Locking Cam and Pawl
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Solution Overview
Problem
Existing slat construction mechanisms require complex structures with numerous joints, leading to high maintenance efforts and inadequate resistance against forced opening and environmental factors, failing to achieve RC3 classification as per DIN EN 1627.
Innovation Solution
A compact arrangement featuring a peripheral blind frame profile, coupling rods, driving pin holders, lever arms, and pawls, which convert linear movement into rotary motion and provide self-locking mechanisms to secure slats in closed positions, utilizing a cam plate and pawl system for enhanced security and reduced mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex arrangement with multiple lever arms and swivel joints is used to move slats, then the slats can be opened and closed, but the maintenance effort increases significantly
Solution Approach 1:
The patent extracts the essential movement function from the complex multi-lever system and implements it through a single linearly movable element that directly couples to the slat shaft, eliminating unnecessary intermediate joints while preserving the opening/closing functionality
Solution Approach 2:
The single linearly movable element serves multiple functions simultaneously: it acts as both the actuator for slat movement and the coupling mechanism between drive and slat, replacing the need for separate lever arms and joints
2Reliability
If conventional locking mechanisms are used, then slats can be secured in closed position, but resistance to forced opening is insufficient for RC3 classification
Solution Approach 1:
The locking mechanism uses the dynamic position of the linearly movable element to provide different functions: in the lower position it enables slat movement, while in the upper position it engages the locking function, with the self-locking effect emerging from the mechanical geometry rather than additional locking components
Solution Approach 2:
The system achieves self-locking through the geometric arrangement where the linearly movable element in its upper position creates a mechanical self-locking effect that prevents forced opening without requiring external power or additional active locking components
3Shape
If the movement mechanism is arranged inside the slat construction for optical reasons, then aesthetics improve, but the mechanism requires more space
Solution Approach 1:
The patent changes the movement parameter from rotational (multiple lever arms) to linear (single movable element), which allows the mechanism to be more compact and better integrated into the limited space available within the frame profile
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 reduces maintenance requirements, achieves RC3 classification by ensuring self-locking of slats in all positions, providing additional security against external opening and maintaining effective sealing with reduced mechanical stress on the system.
Implementation Method 1
The lever arm has an angled slot that can be divided into a first leg that is aligned radially to the axis of rotation, an apex and a second leg that is at a first angle α
Implementation Method 2
a cam plate and pawl system for enhanced security and reduced mechanical stress
Data Source
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AI summary
The invention relates to an arrangement for moving and locking the louvers of a louvered structure, which is used particularly in building installations. The invention is based on the objective of creating a low-maintenance arrangement for moving and locking a louvered structure that consists of as few, simple components as possible. With an arrangement according to the invention, it is possible that, firstly, the louvers are locked in all positions by the self-locking mechanism of an electromechanical drive; secondly, when the louvers are in a vertical position (closed position), an additional self-locking mechanism occurs between the drive pin holder and the lever arm; and thirdly, a latch pivots from the frame into the closed louver and locks it, so that opening from the outside without damage is not possible. An arrangement according to the invention allows for RC3 classification.