Door Window Constrained Opening Guide Body Latch Mechanism
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Solution Overview
Problem
Existing door and window constraining devices do not allow for automatic selection of both free and constrained open configurations, and suffer from reduced reliability due to wear and interference issues with elastically compliant profiles.
Innovation Solution
A device with a guide body having lateral openings in the slot and a locking lever or latch system, controlled by an operating rod, enables automatic selection of open configurations and maintains precise positioning and safety through a cam profile mechanism and elastic element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed slot is used in the guide body to constrain the leaf opening, then the leaf can be locked in a fixed intermediate position, but the user must physically remove the pin from the slot to open the leaf freely
Solution Approach 1:
The slot is transformed from a closed static structure to a dynamic structure with movable walls. The first wall can move between a closed position (providing locking) and an open position (allowing free passage of the pin). This enables the system to switch between constrained and free opening modes without manual intervention, resolving the contradiction between locking reliability and operational convenience.
2Ease of operation
If an elastically compliant shaped profile is used to lock the pin, then the leaf can be stabilized in the constrained open position, but the reliability reduces over time due to wear
Solution Approach 1:
The elastically compliant shaped profile is removed from the system and replaced with a latch member that engages with a cam profile. This extraction eliminates the wear issues associated with elastic deformation and repeated engagement of compliant profiles, while maintaining the automatic positioning function through the cam-latch mechanism.
Solution Approach 2:
The elastic compliance mechanism is replaced with a cam profile and latch system. The cam profile provides the mechanical guidance and positioning, while the latch provides secure engagement. This substitution replaces a wear-prone elastic system with a more durable mechanical system that maintains reliability over time.
3Reliability
If the pin is constrained in a closed slot, then the leaf opening angle is limited, but automatic selection of free and constrained configurations is not possible
Solution Approach 1:
The system incorporates dynamic elements (movable first wall, latch member) that allow automatic transition between constrained and free configurations. The latch engages with the cam profile at specific positions to provide precise constrained positioning when needed, while allowing free movement when the latch is disengaged, thus achieving both positioning precision and configuration flexibility.
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
Enables quick and precise switching between free and constrained open configurations without manual intervention, maintaining high precision and safety by using a cam profile mechanism and elastic element to control the latch, reducing wear and improving reliability.
Implementation Method 1
an elastic element (15) interposed between the base (11) of the guide body (6) and the latch (10) and able to keep the latch (10) pushed in the direction of its engagement with the cam profile (10b)
Data Source
AI summary
Described is a device for constraining the opening of doors or windows comprising a guide body associated with a perimeter profile of a movable leaf and equipped with a slot; an operating arm articulated, at a first end, to a fixed frame, and a second end slidably connectable, by a pin, inside the slot of the guide body so as to allow a sliding stroke of the pin along the guide slot to define an open configuration with a limited angle of the leaf; the guide body is provided with two lateral openings facing each other made on the walls defining the slot to allow a free passage, through one of the openings, of the pin of the arm housed in the slot when the leaf is in a free open configuration; a locking lever or latch articulated to a base of the guide body and configured for locking the pin of the arm when it is positioned at an end of the slot of the guide body in the open configuration with a limited angle of the leaf; an operating rod slidably inserted along the body and having a pair of protruding walls configured to temporarily close, in use, the openings of the slot at least at the passage from the closed configuration to the open configuration at a limited angle of the leaf.