Window Fitting Selector Mechanism for Single-Movement Ventilation
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Solution Overview
Problem
Current locking devices for doors and windows, such as espagnolette locks, require users to perform a double manipulation to reach the ventilation opening position, which can be strenuous and difficult for individuals with reduced mobility due to the need for a 180° rotation of the control handle.
Innovation Solution
A control device with a selector mechanism that allows users to select an opening mode through a single movement of the handle, enabling both the first and second unlocked positions to be achieved with a defined amplitude in the same direction, utilizing a handle that pivots around an axis parallel to the support, and incorporating elastic return means to maintain the unlocked position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a 180° rotation of the control handle is used to reach the ventilation opening position, then the locking device can achieve the unlocked position, but the operation becomes strenuous and difficult for individuals with reduced mobility
Solution Approach 1:
The patent segments the unlocking operation into two independent parts: (1) a 90° handle rotation that remains unchanged, and (2) a linearly movable selector switch that can be positioned in either a first position (for 90° total rotation to first unlocked position) or a second position (for 180° total rotation to second unlocked position). This segmentation allows the user to choose the appropriate rotation angle based on the desired opening mode, significantly easing operation for individuals with reduced mobility while maintaining the necessary device complexity through the added selector mechanism.
2Ease of operation
If a selector mechanism is added to enable single-movement operation, then ease of operation improves, but device complexity increases
Solution Approach 1:
The patent introduces a selector switch as an intermediary element between the user's input and the drive mechanism. This selector switch mediates the transmission of rotational movement from the handle to the locking mechanism by selectively engaging different drive members (first drive member for 90° rotation, second drive member for 180° rotation) based on its position. The intermediary selector simplifies the user's task to a single 90° rotation while internally managing the complexity of providing different rotation outcomes, thus improving ease of operation with a controlled increase in device complexity.
3Reliability
If the handle is designed to return automatically to the locking position, then operational safety improves, but additional elastic return means are required
Solution Approach 1:
The patent implements a self-service mechanism where the handle automatically returns to its initial locking position after the user releases it following the 90° rotation. This is achieved through elastic return means (such as a spring) that are pre-loaded and automatically activate when the user's grip is released. The system serves itself by autonomously resetting to the safe locked position without requiring additional user action, thereby improving reliability through automatic safety engagement while adding only the necessary elastic components.
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 easy and effortless operation of locking devices, allowing users to achieve desired opening modes without the need for complex rotations, improving accessibility and ease of use for individuals with mobility issues.
Implementation Method 1
said handle being brought back automatically into its initial position by elastic return means
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The method involves selecting an opening corresponding to an unlocked position (7) of a driving unit (5) through a selector control unit (9) from a locking position. A handle (2) is moved in a direction according to a defined amplitude to move the driving unit from the unlocked position depending on the selector control unit, where the handle is moved between the locking position and another unlocked position (4). The driving unit is maintained in the former unlocking position against action of an elastic unit. An independent claim is also included for a control device for controlling a fitting lock e.g. casement bolt or casement bolt lock.