Snap-Fit Kit Frame for Tool-Free Gate Assembly

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Solution Overview

Problem

Traditional gate frame assembly methods require specialized tools, skilled labor, and complex machining, leading to high costs, corrosion issues, and visible white marks due to oxidation, necessitating factory assembly and bulk packaging.

Innovation Solution

A prefabricated kit frame comprising hollow tubes with internal stiffeners and snap-fit connections, allowing assembly without tools or training, and featuring a locking mechanism to prevent oxidation and white marks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If welding is used to assemble gate frame elements, then structural strength is improved, but manufacturing cost increases and requires qualified personnel

Engineering Contradiction:

Improvestructural strengthVSAvoidmanufacturing cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent replaces the welding process (thermal/mechanical system) with a mechanical snap-fit connection system. The cross members feature ends shaped to be inserted into openings in uprights, with elastic deformation enabling snap-in without special tools or skilled labor, thereby eliminating welding costs while maintaining structural integrity through precise mechanical interlocking

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The assembly system is designed to be self-sufficient, requiring no external equipment or specialized personnel. The snap-fit mechanism allows anyone to assemble the gate frame using only the components themselves, with the elastic deformation of cross member ends providing the necessary force for connection without additional tools or energy input

Inventive Principle:

Principle #25Self-service

2Manufacturing precision

If machining openings and housings is used to assemble gate frame elements, then connection precision is improved, but manufacturing cost increases and requires specialized tooling

Engineering Contradiction:

Improveconnection precisionVSAvoidmanufacturing cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The connection system is segmented into distinct functional features: openings in uprights, shaped ends on cross members, and elastic deformation zones. This segmentation allows each component to be manufactured independently with standard extrusion processes, avoiding costly post-extrusion machining while maintaining precise fit-through-the-snapp

Inventive Principle:

Principle #1Segmentation

3Stability of the object's composition

If elements are assembled before lacquering, then assembly structure is improved, but oxidation and white marks occur on exposed ends

Engineering Contradiction:

Improveassembly structureVSAvoidoxidation and white marks

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent applies lacquer to the ends of cross members before assembly, creating a protective coating that prevents oxidation and white marks. This preliminary lacquering of exposed surfaces eliminates the corrosion problem that would otherwise occur after assembly, while the snap-fit connection ensures continuous contact for structural stability

Inventive Principle:

Principle #10Preliminary action

4Manufacturing precision

If factory assembly is used for gate frames, then assembly quality is improved, but transportation packaging becomes bulkier and cost increases

Engineering Contradiction:

Improveassembly qualityVSAvoidpackaging volume

Core Design Contradiction:

Manufacturing precisionVSVolume of stationary object

Solution Approach 1:

The gate frame is segmented into modular components (uprights and cross members) that can be packaged separately in compact configurations. The snap-fit design allows these segments to be easily assembled on-site without requiring factory assembly, reducing packaging volume while maintaining assembly quality through the self-aligning nature of the connection features

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The elastic deformation capability of cross member ends provides dynamic adjustment during assembly, allowing the components to self-align and accommodate minor variations in positioning. This dynamic feature enables high-quality assembly from pre-packaged components without requiring factory-level precision equipment

Inventive Principle:

Principle #15Dynamics

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 kit frame enables quick, tool-free assembly of robust gates with no visible oxidation, reducing costs and eliminating white marks, while allowing for easy transportation and installation.

Implementation Method 1

said end of each cross member is elastically deformable to be snapped into said first stiffener of the uprights

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP3771799B1Frame in economical kit form for a fixed, hinged or sliding leaf for a gate

Publication Date: 2026.03.18 GP PORTAIL

Figure 1
Figure 2~3
Figure 4~6

AI summary

The present invention relates to a kit frame(1) intended in particular for making a leaf, said kit frame(1) comprising at least two uprights (2,3) and two cross members (4,5) connected together, remarkable in that each upright (2,3) is a hollow tube provided with at least: - an outer casing, - a first flat stiffener extending longitudinally inside said casing, - a first opening made on the casing and passing through at least the thickness of the latter, and - a second opening made in the first stiffener and arranged in the extension of the first opening and having a shape similar to that of said first opening, and in that each cross member (4,5) has at least one longitudinal end shaped to be inserted in a fitted manner into the first and second openings associated and snapped into said upright (2,3).