Universal Corner Joint for Window Frame Alignment And Fastening

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Solution Overview

Problem

Existing corner joints for window frames require separate alignment and fastening joints, leading to increased assembly time and cost due to instability and the need for eccentric stabilization means that can loosen over time, causing stress and potential damage to the sections.

Innovation Solution

A corner joint with wings shaped to fit within the longitudinal channels of installed sections, featuring fastening plates and screws for stable fastening, and centering/stabilization means to ensure secure alignment without additional components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If corner joints use wings with greater width than the longitudinal opening to enable insertion through axial openings, then the joints can be installed before sections are mounted, but the sections must not yet be installed and axial openings must be accessible

Engineering Contradiction:

ImproveAccessibility for installationVSAvoidInstallation timing flexibility

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The corner joint is divided into two separate functional components: an alignment corner joint with stabilization means for positioning, and a fastening corner joint with fastening means for securing. This segmentation allows each component to be optimized for its specific function and enables flexible installation timing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The alignment corner joint with stabilization means is designed to be installed first to establish proper positioning and alignment of the sections. This preliminary action prepares the structure for subsequent fastening operations.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If corner joints use eccentric-type stabilization means to stabilize wings inside longitudinal channels, then the wings are stabilized in position, but the stabilization means cannot perform fastening function and must be used with additional corner joints

Engineering Contradiction:

ImproveWing positioning stabilityVSAvoidNumber of joint components

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The corner joint system is segmented into two distinct functional joints: one dedicated to alignment and stabilization, and another dedicated to fastening. This clear segmentation allows each component to be simple and effective in its specific role.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The alignment corner joint with stabilization means serves the universal purpose of positioning wings in both axial and orthogonal directions, while the fastening corner joint provides the fastening function. Together they create a complete multi-functional solution.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If alignment corner joints and fastening corner joints are used separately to connect installed sections, then stable fastening is achieved, but assembly time and cost increase due to需要使用 two different joints

Engineering Contradiction:

ImproveFastening stabilityVSAvoidAssembly efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Inventive Principle:

Principle #10Preliminary action

4Stability of the object's composition

If eccentric-type stabilization means are used to increase wing width to match longitudinal channel width, then the wings are stabilized inside the channel, but great stress is applied to sections with risk of damage

Engineering Contradiction:

ImproveWing stabilizationVSAvoidStress on sections

Core Design Contradiction:

Stability of the object's compositionVSStress or pressure

Solution Approach 1:

The stabilization function is extracted from the fastening operation. The alignment corner joint with stabilization means is installed separately before fastening, so that stabilization can be achieved without applying stress during the fastening process.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4438844B1Universal corner joint

Publication Date: 2025.10.08 L M DEI F LLI MONTICELLI SPA

Figure 1~2A
Figure 3
Figure 4~4A

AI summary

A corner joint (1) comprising a first wing (10) and a second wing (11) suitable for being orthogonally inserted into longitudinal channels (20, 30) of respective sections (2, 3) for connecting said sections (2, 3) to each other; at least one of said two wings (10, 11) being provided with fastening means comprising a fastening plate (10c, 11c) projecting laterally from said at least one wing (10, 11) and comprising a longitudinal groove (10d, 11d) suitable for accommodating a longitudinal rib (25, 35) provided on the respective section (2, 3).