Window Fitting with Axial Decoupling Handle

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Solution Overview

Problem

Existing door and window fittings with rigid connections between actuating handles and drive pins pose a risk of unauthorized access and break-ins, as they can be levered open from the outside, and existing security mechanisms are often complex and costly.

Innovation Solution

A fitting with a rotating handle that decouples from the drive pin in a first position and couples in a second position, featuring a blocking device that moves axially to prevent unauthorized actuation, combined with a coupling element that securely engages the handle with the drive pin only when in the second position, enhancing security and ease of use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a rigid connection between the drive pin and the actuating handle is used, then the mechanism is simple and durable, but the window or door can be levered upward against the window frame and manipulated from the outside

Engineering Contradiction:

Improvesecurity against unauthorized actuationVSAvoidcomplexity of the fitting mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The coupling element is divided into multiple functional parts: a drive pin actuator with blocking recesses, a handle actuator with actuating elements, and blocking elements. These segmented components work together to provide security while maintaining simplicity of operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The coupling element acts as an intermediary mechanism between the handle and the drive pin. It includes blocking elements that can engage with blocking recesses to prevent unauthorized actuation, while still allowing legitimate operation through the actuating elements.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a complex latching mechanism with sleeve and bolts is used to block handle rotation, then security against unauthorized actuation is improved, but the construction becomes more expensive and complex

Engineering Contradiction:

Improveprotection against break-insVSAvoidmanufacturing cost and simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Instead of using a sleeve that blocks handle rotation from the outside, the invention inverts the approach by using blocking elements within the coupling element that prevent drive pin actuation. The blocking is achieved through the engagement of blocking elements with blocking recesses, rather than blocking the handle itself.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The coupling element uses a simplified blocking mechanism that copies the security function of the complex latching mechanism but implements it through a different, simpler approach using blocking elements and recesses rather than sleeves and bolts.

Inventive Principle:

Principle #26Copying

3Ease of operation

If the handle is always coupled to the drive pin, then the mechanism is easy to operate, but unauthorized actuation from the outside becomes possible

Engineering Contradiction:

Improveease of manipulating the handleVSAvoidsecurity against unauthorized access

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The coupling between the handle and drive pin is made dynamic rather than static. The coupling element can transition between coupled and uncoupled states based on the position of the handle actuator relative to the blocking elements, providing security while maintaining ease of operation.

Inventive Principle:

Principle #15Dynamics

4Reliability

If a two-step movement mechanism is implemented, then security against unauthorized actuation by children is improved, but the operation becomes more complex

Engineering Contradiction:

Improvesafety against child accessVSAvoidsimplicity of handle manipulation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The mechanism requires a preliminary action (axial movement of the handle actuator to disengage blocking elements) before the main operation (rotation of the handle) can be performed. This two-step process ensures that children cannot accidentally operate the mechanism while still allowing easy operation by authorized users.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11391059B2Window and/or door fitting

Publication Date: 2022.07.19 HOPPE AG

AI summary

The invention relates to a fitting (1) for actuating a mechanism in a door or window, which has a handle (10) that is rotatably supported in or on a stop element (20) about an axis of rotation (D), wherein the stop element (20) can be fastened to the door or window, a drive pin (40) for actuating the mechanism in the door or window, a coupling element (50) for coupling the handle (10) to the drive pin (40), and a blocking device (70), which blocks the actuation of the drive pin (40) about the axis of rotation (D) when in the blocking position (A), wherein the blocking device (70) can be moved to a releasing position (B) through an axial actuation of the handle from a first position to a second position along the axis of rotation (D). In order to ensure increased security against unauthorized actuation of the fitting or the mechanism connected to the fitting in the window or door, and to obtain a fitting that is easy to manipulate and inexpensive to produce, the handle (10) is decoupled from the drive pin (40) in the first position (I), wherein the blocking device (70) is then in the blocking position (A), and the coupling element (50) couples the handle (10) and the drive pin (40) in the second position, and keeps the blocking device (70) in the releasing position (B). When the second position is reached, the handle is coupled to the drive pin, and unlocks it for the actuation of the mechanism.