Swivel Hook Stop Surface for Lift-and-Slide Door Security
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Solution Overview
Problem
Existing fitting arrangements for lift-and-slide doors, such as those with mushroom head pins and swivel hooks, can be forcibly opened from the outside, compromising security and burglary protection.
Innovation Solution
A swivel hook with a stop surface oriented transversely to the engagement section, which engages with the upper edge of the striking plate opening when the door is lifted, preventing disengagement and ensuring the door remains secured, even under external force, by having a distance greater than the strike plate opening's clear width between the free end and the stop surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mushroom-headed locking bolt is used to secure the door in closed position, then the door can be locked when closed, but the door can be forcibly lifted from the outside and slid open
Solution Approach 1:
The locking system transitions from a static mushroom-headed bolt to a dynamic pivot hook that changes position based on door state. The pivot hook automatically pivots between engaged and disengaged positions depending on whether the door is closed or forced open, providing adaptive security response.
Solution Approach 2:
The pivot hook is pre-positioned to engage with the strike plate opening before any forced opening attempt occurs. The engagement section is designed to automatically engage when the door is properly closed, preventing forced lifting before it can occur.
2Reliability
If pivot hooks are used to secure the door, then the door can be locked in closed position, but the hook can be swung from engaged to disengaged position when the door is forcibly lifted
Solution Approach 1:
The stop surface is pre-configured to contact the upper edge of the strike plate opening before any prying action can disengage the hook. This preliminary contact creates resistance that prevents the hook from being swung from engaged to disengaged position during forced opening attempts.
Solution Approach 2:
The distance parameter between the stop surface and free end is specifically designed to be greater than the clear width of the strike plate opening. This parameter change ensures that the stop surface engages the upper edge first, creating a mechanical barrier against prying actions.
3Reliability
If the pivot hook engages behind the lower edge of the strike plate opening, then the door is secured in closed position, but the hook can be disengaged when the door weight no longer offers resistance
Solution Approach 1:
The engagement section combines both the lower edge engagement (for normal locking) and the stop surface (for forced opening prevention) into a single integrated component. This merging allows the pivot hook to perform both functions: securing the door when closed and resisting forced opening attempts.
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a lock plate arrangement for securing a window, a door, or the like on a lock plate, wherein the fitting arrangement comprises a swivel hook which can be swiveled about a swivel axis between an outer engagement position and an inner engagement position and has an engagement section for engagement in an opening in a lock plate. Formed on the engagement section, at a distance from the free end of the same, is a stop surface which is oriented transversely with respect to the outside of the engagement section and which faces away from the free end of the engagement section.