Building Closure Locking Element for Burglary and Explosion Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reduction in rebate chamber width from 14 mm to 11.5 or 12 mm, as introduced with the Euro-Groove, restricts the use of standard fittings for building closures, making it impossible to equip them with previously implemented locking elements for burglary and explosion protection without increasing the rebate width or forming thinner locking elements that are insufficient for security.
Innovation Solution
The design incorporates a sash-side locking element with a hook section engaging in a groove of the sash profile, coupled with a push rod, which provides stable fastening and prevents tilting or twisting, allowing for the use of thinner locking elements despite the reduced rebate width, and includes clip sections forming a clasp to enhance stability and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rebate chamber width is reduced to accommodate Euro-Groove standards, then standard fittings can be used and device complexity is reduced, but locking elements become too thin to provide sufficient burglary and explosion protection
Solution Approach 1:
The locking element is extended in the depth direction (perpendicular to the sash profile front surface) to engage hooks into grooves, transforming a two-dimensional planar locking mechanism into a three-dimensional engagement system. This allows the locking element to achieve sufficient strength and anti-prying capability despite reduced width in the rebate chamber, as the depth engagement provides mechanical interlocking that prevents forced entry.
Solution Approach 2:
The locking element is divided into distinct functional segments: a head portion for engagement with the frame, a body portion with hook sections for engaging grooves in the sash profile, and connection portions for attachment to the push rod. This segmentation allows each part to be optimized for its specific function while maintaining overall compactness within the reduced rebate chamber width.
2Area of stationary object
If locking elements are made thinner to fit reduced rebate width, then space for standard fittings is improved, but security against burglary and explosion deteriorates
Solution Approach 1:
The locking element compensates for reduced width by extending in the depth direction with hook sections that engage into grooves formed in the sash profile. This three-dimensional engagement geometry provides mechanical interlocking that resists prying forces and explosive impacts, maintaining security performance despite the reduced cross-sectional area in the rebate chamber.
Solution Approach 2:
The locking element is constructed from high-strength materials with optimized mechanical properties to maximize strength-to-weight ratio and strength-to-size ratio. The material selection and structural design work together to provide burglary and explosion resistance within the constrained space of the reduced-width rebate chamber.
3Strength
If locking elements are made thicker to improve security, then burglary and explosion protection is enhanced, but space for standard fittings in the rebate chamber is insufficient
Solution Approach 1:
Instead of increasing width, the locking element achieves enhanced strength by extending in the depth direction with hook sections that engage into grooves. This vertical engagement provides lever-arm resistance against prying forces and distributes loads along the depth dimension, achieving high security performance without increasing the width that would conflict with standard fittings in the rebate chamber.
4Strength
If the groove for hook section is oriented parallel to the filling plane, then the locking element achieves stable fastening and resistance against prying forces, but the structural complexity of the sash profile increases
Solution Approach 1:
The groove structure in the sash profile serves multiple functions: it provides mechanical engagement for the hook section to prevent prying, guides the locking element during operation, and integrates with the overall sash profile design. By combining these functions into a single geometric feature, the structural complexity is minimized while achieving the desired security performance.
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
The window (1, 1 ') or door frame with a blended frame (3). Between the frame (5) and the window frames (3) is an arranged push rod (9), which is arranged lengthwise and connected with interlocking elements (14). A bladed frame sided interlocking element (14) is connected with a backing element (16) and according to the movement of the push rod in a hollow section (17) in the framework locking element is moved.