Concrete Opening Formwork Sliding-Tilting Mechanism for Reliable Demolding

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Solution Overview

Problem

Existing formwork systems for creating openings in concrete elements, such as windows or doors, face challenges in easy and reliable separation from the concrete due to adherence issues and high load exposure, leading to complex and potentially malfunctioning demolding processes.

Innovation Solution

A formwork-stripping device with a sliding and tilting mechanism that allows the frame element to be moved parallel to the formwork panel and tilted about a pivot axis parallel to it, facilitating easy separation by sliding and tilting the frame element away from the concrete element.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the frame parts are held articulately jointed in guides with spindles for pivoting, then the opening formwork can be reduced in size for removal, but the demoulding process becomes complex and spindles are exposed to high loads causing malfunctions

Engineering Contradiction:

Improvesize of opening formworkVSAvoidcomplexity of demoulding process

Core Design Contradiction:

Volume of moving objectVSDevice complexity

Solution Approach 1:

The frame is divided into multiple frame parts that can be independently manipulated. Each frame part can be pivoted individually about a pivot axis, allowing selective adjustment and simplification of the demoulding process while maintaining the ability to reduce overall formwork size.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using spindles to pivot the frame parts within guides (complex mechanism), the invention inverts the approach by providing pivot axes directly on the formwork panel and attaching frame parts directly to these pivot axes. This eliminates the need for spindles and guides, greatly simplifying the mechanism while achieving the same size reduction function.

Inventive Principle:

Principle #13The other way round (Inversion)

2Length of moving object

If spindles are extended or shortened to create sufficient distance between frame parts and concrete element, then the formwork can be released, but frame parts may adhere to the concrete element blocking the stripping process

Engineering Contradiction:

Improvedistance between frame parts and concrete elementVSAvoidreliability of formwork stripping

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The invention eliminates the spindle mechanism entirely and uses direct pivotal attachment of frame parts to the formwork panel. The frame parts are pivoted directly about pivot axes on the formwork panel, providing reliable control over distance without the complexity and reliability issues of spindles.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The frame parts are designed with movable pivotal attachment to the formwork panel, allowing dynamic adjustment of their position and distance from the concrete element. This dynamic capability ensures that frame parts can be reliably positioned to prevent adhesion while maintaining control during the stripping process.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If guides and spindles are used to pivot and adjust frame parts, then the opening formwork can be manipulated, but the components are exposed to high loads during concreting leading to malfunctions

Engineering Contradiction:

Improvemanipulability of opening formworkVSAvoidreliability of guides and spindles

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The invention extracts and removes the guides and spindles from the system entirely. Instead of using these separate components, the frame parts are attached directly to the formwork panel with pivotal attachment, eliminating the problematic elements that were exposed to high loads while preserving the necessary manipulability through direct pivoting.

Inventive Principle:

Principle #2Taking out (Extraction)

4Device complexity

If the frame element is only slid along the inner side of the formwork panel, then the structure is simple, but adhesion to the concrete element can block the stripping process

Engineering Contradiction:

Improvesimplicity of stripping mechanismVSAvoidreliability of formwork separation

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The invention adds a rotational dimension to the movement of frame parts by providing pivotal attachment. Frame parts can now perform both sliding motion along the formwork panel and rotational motion about pivot axes, creating a two-dimensional movement capability that reliably prevents adhesion while maintaining relative structural simplicity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12365112B2Formwork

Publication Date: 2025.07.22 UMDASCH GROUP NEWCON GMBH

AI summary

The disclosure relates to formwork for producing a concrete element, in particular a wall element or ceiling element, having an opening, in particular a window opening or door opening, the formwork comprising: a formwork panel; opening formwork, which has a frame element for delimiting a portion of the opening, a support bracket for supporting the frame element, and a mounting element for mounting the support bracket; a formwork-stripping device for transferring the opening formwork from a formwork position for the formation of the opening into a formwork-stripping position for the release of the concrete element, wherein the formwork-stripping device has a sliding and tilting mechanism for sliding the frame element in a direction parallel to the formwork panel and for tilting the frame element about a pivot axis running substantially parallel to the formwork panel.