Electromagnetic Door Opener Dual-Stage Formlock Against Twisting
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Solution Overview
Problem
Existing electromagnetic door openers are ineffective in resisting twisting forces, with the second stage providing weak resistance due to a weak formlock between locking members, which compromises security.
Innovation Solution
The electromagnetic door opener features a safety device with a primary and secondary safety stage, where locking members form a formlock and are supported against the housing floor, utilizing a kinematic chain of levers and oblique surfaces to maintain consistent resistance against forced opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a weak formlock between locking members is used in the second stage, then the device complexity is reduced, but the resistance to forced opening (strength) deteriorates
Solution Approach 1:
The safety device is divided into two distinct stages: a primary safety stage with a first formlock between locking members, and a secondary safety stage with a second formlock between a locking member and the housing floor. This segmentation allows each stage to contribute independently to the overall resistance, ensuring that even if one stage is compromised, the other maintains security while keeping individual components relatively simple
Solution Approach 2:
The invention transitions from a single-plane formlock to a multi-dimensional locking system. The locking members engage with both each other (primary stage) and with the housing floor (secondary stage), adding a vertical dimension to the locking mechanism. This dimensional expansion significantly increases resistance to forced opening without proportionally increasing complexity
2Ease of manufacture
If only a formlock between locking members is used, then the ease of manufacture is improved, but the reliability against twisting forces deteriorates
Solution Approach 1:
The invention merges two formlocking mechanisms into a unified safety system. The first formlock between locking members and the second formlock between the locking member and housing floor work together synergistically. This combination maintains manufacturing simplicity by using the same basic formlock principle in both stages, while dramatically improving reliability through the cumulative effect of both locking stages
Solution Approach 2:
The dual-stage formlock system acts as a precautionary measure against potential failures. The primary formlock provides the first line of defense, while the secondary formlock with the housing floor serves as a backup safeguard. This beforehand cushioning ensures that even if the primary locking mechanism is compromised, the secondary mechanism maintains the door's closed position against twisting forces
Data Source
AI summary
The invention relates to an electromagnetic door opener comprising a housing for installing in a door frame, a pivotable cover which can be rotated between an open position and a closed position, and a security device operating counter to a forced rotation of the cover from the closed position into the open position, which comprises a primary security step and a secondary security step. Said door opener is characterized in that the secondary security step comprises a locking element which is supported in a form fit on the base of the housing of the door opener housing.