Toggle Fixing with Counterbearing Element for Screw Adaptability
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Solution Overview
Problem
Existing toggle fixings are limited in their ability to accommodate screws of varying diameters and thread forms, leading to issues with purchase and stability when screws differ from the intended form.
Innovation Solution
A toggle fixing design featuring a crosspiece with a pivotally connected strip and a counterbearing element, allowing for screws of different diameters and thread forms to be securely held through an internal thread and counterbearing element configuration, which can adapt to accommodate screws with non-standard dimensions and thread pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the threaded bore is designed for a specific screw diameter and thread form, then the screw can be properly secured in the threaded bore, but screws with different diameters or thread forms cannot be used (too small diameter screws have no purchase, too large diameter screws cause the crosspiece to turn)
Solution Approach 1:
The crosspiece is designed with a through-opening instead of a threaded bore, allowing it to accommodate screws of various diameters and thread forms. The opening acts as a universal receptacle that can receive different screw types, while the counterbearing element provides the necessary support for secure fixation regardless of screw specifications.
Solution Approach 2:
The counterbearing element serves as an intermediary component between the crosspiece and the screw. It provides a bearing surface that supports the screw shaft, enabling secure fixation even when the screw diameter is smaller than the opening diameter. The counterbearing element mediates the interaction between the crosspiece structure and the variable screw parameters.
2Adaptability or versatility
If a threaded bore with internal thread is used, then standard screws can be secured, but non-standard screws (different pitch or thread form) cannot be properly engaged
Solution Approach 1:
The through-opening in the crosspiece serves as a universal receptacle that can accommodate screws with various thread pitches and forms, eliminating the need for specialized threaded bores for each screw type. This single structural feature provides multi-functional compatibility across different screw standards.
Solution Approach 2:
The internal thread is extracted from the crosspiece structure itself and replaced by a separate counterbearing element. This separation allows the crosspiece to maintain a simple through-opening geometry while the counterbearing element provides the necessary bearing function, achieving versatility without complicating the crosspiece manufacturing.
3Length of moving object
If the crosspiece diameter is reduced to fit through smaller drilled holes, then the toggle fixing can be installed in thinner building components, but the crosspiece becomes more prone to deformation and cannot support larger screws
Solution Approach 1:
The crosspiece is designed with a length significantly greater than its diameter, creating a dimensional disparity that allows the diameter to be small enough for drilled holes while the length provides sufficient structural strength. The elongated geometry transfers load along the longitudinal axis, maintaining strength despite reduced cross-sectional dimensions.
Solution Approach 2:
The counterbearing element acts as an intermediary that supports the screw shaft, distributing mechanical loads away from the crosspiece body. This allows the crosspiece to maintain small dimensions for hole compatibility while the counterbearing element compensates for the reduced structural capacity by providing additional support points.
Data Source
AI summary
A toggle fixing for fixing an article to a thin-walled building component. The toggle fixing includes a crosspiece and a strip which is connected to the crosspiece and serves for holding the crosspiece during mounting. An opening for receiving a screw is formed centrally on the crosspiece, the opening extending along an opening longitudinal axis (LÖ). In order that screws of which the external diameter (DA) is smaller than the internal diameter (DK) of the opening can also be fixed to the crosspiece it is proposed that there be arranged on the crosspiece at least one counterbearing element having a spacing (AW) from the opening longitudinal axis (LÖ) that is less than half the internal diameter (DK) of the opening.