Window Lock Bolt Cylinder Mechanism for Burglar Resistance
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Solution Overview
Problem
Conventional windows face a trade-off between enhanced burglar resistance and maintaining a large window pane area for maximum light intake and heat insulation, which often results in thin and weak sash and frame members.
Innovation Solution
An openable window design featuring a bolt slidably and rotatably received in a cylinder, with a keep anchored to a frame member, providing improved resistance against burglar attempts by obstructing movement with an engagement head and utilizing a resilient bias and guiding mechanism, while allowing controlled movement from an accessible end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a key-operated locking cylinder is mounted on the sash to improve burglar resistance, then burglar resistance is significantly improved, but the device complexity increases and ease of operation deteriorates
Solution Approach 1:
The invention extracts the key-operated locking cylinder from the sash and relocates it to the window frame. This removes the complexity and operational inconvenience from the moving sash component while maintaining the security function in the stationary frame, thereby improving burglar resistance without compromising ease of operation.
Solution Approach 2:
Instead of mounting the locking mechanism on the sash as conventionally done, the invention inverts the arrangement by mounting it on the window frame. This inversion allows the locking mechanism to remain stationary and accessible, eliminating the need for keys on the sash itself while achieving the same security objective.
2Strength
If thicker and stronger sash members and frame members are used to improve burglar resistance, then strength and reliability are improved, but the area available for window panes decreases, reducing light intake
Solution Approach 1:
The invention extracts the security reinforcement function from the sash and frame members themselves and relocates it to a dedicated locking mechanism mounted on the frame. This allows the sash and frame members to remain thin and lightweight to maximize window pane area, while the separate locking mechanism provides the necessary burglar resistance.
Solution Approach 2:
The invention segments the security function from the structural members by introducing a separate locking mechanism. This segmentation allows the sash and frame to be optimized for light intake with thinner profiles, while the dedicated locking component handles the burglar resistance requirement independently.
Data Source
Figure 1a
Figure 1b
Figure 2a~2b
AI summary
A window, such as a pivot- or bottom-hung roof window, with a window frame (2) and a sash (1) pivotally hung to the window frame (2). A bolt (38) slidably and rotatably received in a cylinder (30) fixed in a through-going bore in a sash member. A keep (10) secured to a first side of a frame member. The keep (10) is provided with a front slot (11), a recess (4) behind the slot (11) and a rear wall (39) behind the recess. An anchoring member (15) connects the keep (10) to a second side of the frame member that is opposite to the first side of the frame member. The bolt (38) is movable inside the cylinder between a retracted position and an extended locking position wherein the engagement head (40) projects through the slot (11) when the sash (1) is in the closed position.