Tilt Window Latch Gear-Rack Mechanism
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Solution Overview
Problem
Existing window latching mechanisms for double hung windows are insecure, difficult to operate, require overcoming high spring tensions, and involve complex and expensive geared slides, often necessitating additional hardware and precise measurements to prevent malfunction.
Innovation Solution
A modular tilt window latch assembly featuring a gear enmeshed with a rack that operates a distal tilt latch, including a cam and anti-tilt safety device, with a timing mechanism to prevent over-rotation, and an integrated slide bolt and rack partially encased in a sheath, allowing for secure locking and easy installation on various window sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional cam systems are used for window latching, then the window can be locked and unlocked, but the manipulation is difficult and great spring tensions must be overcome to withdraw the latches
Solution Approach 1:
The latch mechanism is divided into separate functional components: a cam for locking engagement, a gear for rotational operation, and a rack for linear movement. This segmentation allows each component to perform its specific function efficiently, reducing the overall force required while maintaining secure locking.
Solution Approach 2:
The gear acts as an intermediary between the user's rotational input and the rack's linear movement, providing mechanical advantage. This intermediary mechanism amplifies the user's effort, reducing the spring tension needed to withdraw the latch while maintaining secure engagement.
2Ease of manufacture
If geared slides are used to operate the tilt latch, then the locking mechanism can be actuated, but the assembly is expensive to manufacture and hard to assemble and install
Solution Approach 1:
The mechanism is segmented into modular components (cam, gear, rack, housing) that can be manufactured separately using standard processes and then assembled. This modularity simplifies manufacturing and reduces complexity compared to monolithic geared slides, while maintaining the necessary functional complexity for secure locking.
Solution Approach 2:
The gear and rack are designed to self-align and self-assemble to a degree, reducing the precision requirements for installation. The interlocking teeth provide inherent alignment guidance, making the assembly process simpler and less expensive while maintaining reliable operation.
3Reliability
If racks are used to engage locking mechanisms, then the tilt latch can be operated, but accurate measurement and cutting are required to prevent timing mishaps from welding or fabrication tolerance
Solution Approach 1:
The gear-rack engagement provides a dynamic self-adjusting mechanism that accommodates minor variations in rack positioning and timing. The interlocking teeth naturally synchronize the motion, reducing the impact of fabrication tolerances and welding variations while maintaining reliable locking operation.
Solution Approach 2:
The design incorporates built-in tolerance compensation through the gear-rack engagement geometry, which anticipates and compensates for potential timing mismatches from manufacturing variations. This beforehand cushioning ensures reliable operation without requiring extremely tight manufacturing tolerances.
4Adaptability or versatility
If additional hardware and modifications to stiles and rails are required, then the latch can be installed, but the installation process becomes more complex and time-consuming
Solution Approach 1:
The latch mechanism is designed as a universal assembly that can be installed on various window types and sizes without requiring custom modifications to stiles or rails. The standardized mounting interface and modular design enable adaptability across different applications while simplifying installation to a straightforward replacement process.
Solution Approach 2:
The latch is segmented into a self-contained modular unit that can be installed as a complete assembly without requiring integration with the window frame components. This segmentation eliminates the need for additional hardware and modifications to stiles and rails, reducing installation complexity while maintaining versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a secure, easy-to-operate, and cost-effective locking mechanism that prevents over-rotation and tilting mishaps, ensuring secure engagement of window sashes while being adaptable to different window sizes and easy to install, reducing manufacturing and assembly complexities.
Implementation Method 1
The locking mechanism also includes a cam and a gear, the cam positioned on the gear and the gear enmeshed with the rack so that rotating the gear operates the slide bolt
Implementation Method 2
The locking mechanism also includes a cam and a gear, the cam positioned on the gear
Data Source
AI summary
A latch and method for a double sash tilt window includes a locking mechanism and a rack having proximal and distal ends. The proximal end of the rack is connected to the locking mechanism while the distal end of the rack is affixed to a slide bolt. The latch also includes a cam and a gear, the cam positioned on the gear and the gear enmeshed with the rack so that rotating the gear operates the slide bolt which prevents the window from tilting.