Building Closure Offset Groove Burglary Resistance
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Solution Overview
Problem
Conventional building closures with safety scissors and bearing elements face challenges in maintaining burglary and blast resistance due to the need for narrower rebate widths, which compromises the strength and stability of locking elements, making them inadequate for protection against break-ins and explosions.
Innovation Solution
The retaining groove of the bearing element and the associated push rod groove are laterally offset, allowing for a more stable connection and increased depth utilization in the folding chamber, enabling a stable and solid bearing element even with a smaller width, and incorporating hook sections for enhanced stability and guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rebate width is reduced to use standard fittings, then the building closure can accommodate standard components and reduce material usage, but the locking elements become weaker and less effective for burglary and blast protection
Solution Approach 1:
The patent applies dimensionality change by offsetting the retaining groove and push rod groove from their conventional aligned positions to laterally offset positions. This spatial reconfiguration allows the bearing element to extend further into the folding chamber depth, utilizing the third dimension (depth rather than width) to compensate for the reduced rebate width. The bearing element engages with the engagement element of the safety scissors at this offset position, creating a more robust connection that maintains strength despite narrower overall dimensions.
2Ease of manufacture
If the rebate width is reduced, then standard fittings can be used and material costs decrease, but the stability and reliability of the safety scissors connection is compromised
Solution Approach 1:
The patent resolves the reliability issue by transitioning from a width-based connection to a depth-based connection. By offsetting the grooves laterally, the bearing element can extend deeper into the folding chamber, utilizing the depth dimension to create a more stable and reliable connection for the safety scissors while still using standard fittings with reduced rebate width.
Solution Approach 2:
The patent applies local quality by concentrating the connection strength at specific localized points rather than distributing it uniformly. The bearing element with its engagement groove creates a localized strong point of connection between the safety scissors and the sash frame, concentrating the load-bearing capacity at the offset groove location rather than requiring uniform thickness throughout the entire rebate area.
3Ease of manufacture
If thinner safety scissors and bearing elements are used to fit narrower rebates, then the building closure can use standard fittings with reduced width, but the elements become too weak to offer adequate protection against burglary or explosion
Solution Approach 1:
The patent resolves the strength contradiction by shifting the critical dimension from width to depth. Instead of increasing thickness or width to strengthen the elements, the offset groove design allows the bearing element to extend deeper into the folding chamber, utilizing the depth dimension to achieve the necessary strength and stiffness for burglary and explosion protection while maintaining reduced rebate width for standard fittings.
Data Source
Figure 1
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AI summary
The closure has casement frame-sided locking elements and a bearing element (15) coupled at a section of a connecting rod (18) that is supported in connecting rod grooves (19). A safety claw part (11) has an engaging element (13) for engaging blend frame-sided locking elements with the casement frame-sided locking elements and the bearing element. A retaining groove (14) of the bearing element and the rod grooves are laterally displaced to each other in a direction perpendicular to a plane defined by fillings (6) such that the grooves do not overlap parallel to the plane. USE : Building closure. ADVANTAGE : The retaining groove of the bearing element and the connecting rod grooves are laterally displaced to each other in the direction perpendicular to the plane such that the grooves do not overlap parallel to the plane, thus holding the safety claw part in a safe manner while protecting the safety claw part against burglary and explosion. DESCRIPTION OF DRAWINGS : The drawing shows a vertical sectional view of an upper part of a building closure with bearing elements and/or casement frame profiles. 6 : Fillings 11 : Safety claw part 13 : Engaging element 14 : Retaining groove 15 : Bearing element 18 : Connecting rod 19 : Connecting rod groove.