Security Screen Frame Locking for Impact-Resistant Attachment
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Solution Overview
Problem
Existing security screens lack sufficient reinforcement to withstand impacts, leading to separation from the frame and potential unauthorized access, with rivets adding manufacturing time and cost and causing corrosion.
Innovation Solution
A security screen design featuring a frame with a cavity and locking member that restricts rotational movement, using a locking member with an end section encapsulated in a slot to prevent detachment, and a lip oriented at an acute angle to the planar portion, ensuring secure attachment without additional fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rivets are fitted to secure the sheet element to the frame, then the security screen can withstand impact, but manufacturing time and cost increase and corrosion occurs due to dissimilar metals
Solution Approach 1:
The invention extracts and eliminates the rivets from the security screen assembly. Instead of using separate fastening components (rivets), the design integrates the sheet element directly to the frame through a mechanical interlocking system where the sheet's flange engages with recesses and locking members in the frame, removing the need for additional fasteners and their associated manufacturing steps and corrosion issues
Solution Approach 2:
The invention merges the sheet element and frame into an integrated assembly where the sheet element's flange and the frame's recesses and locking members work together as a unified mechanical connection system. This integration eliminates the need for separate rivets and creates a cohesive structure where components interlock to provide impact resistance
2Strength
If rivets are fitted to secure the sheet element to the frame, then the security screen can withstand impact, but corrosion occurs due to dissimilar metals being in direct contact
Solution Approach 1:
The invention removes the rivets that caused galvanic corrosion between dissimilar metals. The mechanical interlocking system uses the frame's own structure (recesses and locking members) to secure the sheet element, eliminating the need for foreign fastening materials that would create corrosion pathways between different metal types
Solution Approach 2:
The invention promotes material homogeneity by securing the sheet element through the frame's intrinsic features (recesses and locking members) rather than introducing dissimilar metal fasteners. This approach reduces galvanic corrosion risks by minimizing contact between incompatible metals
3Ease of manufacture
If the sheet element edge is allowed to move towards an obtuse angle, then the sheet element can be installed, but it slips from the frame or deforms the flange under impact
Solution Approach 1:
The invention applies preliminary anti-action by designing the frame with locking members that preemptively prevent the sheet element's flange from moving toward an obtuse angle during installation and service. The locking members engage with the flange in a controlled manner, restricting its movement to acute angles only, thereby preventing the sheet element from slipping or deforming the flange under impact loads
Solution Approach 2:
The locking members are pre-positioned in the frame to establish proper engagement with the sheet element's flange during installation. This preliminary action ensures that the flange is locked in the correct angular position (acute angle) before any impact occurs, preventing subsequent slippage or deformation
Data Source
AI summary
The present invention provides a security screen (10) for securing an opening. The security screen comprising a frame (11) defining an open portion (12) and a sheet element (29) received across the open portion of the frame. The sheet element comprises a planar portion (52) and an edge portion (54) which extends around the perimeter of the planar portion. The edge portion provides a lip (56) which is at an acute angle to the planar portion. The edge portion is received in a cavity in the frame wherein the cavity maintains the lip at an acute angle to the planar portion regardless of an impact thereon.