Window Tilt Latch System with Sash Lock
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Solution Overview
Problem
In tall or high aspect ratio window applications, the stiles of window sashes bow under wind load, causing stress on tilt latches and tilt pins, and existing designs require taller check rail profiles to accommodate sash lock hardware, contradicting the design intent of slim profiles.
Innovation Solution
A window assembly with a sash lock that operates two tilt latch assemblies in each stile, connected by a balance cord, allowing for multiple tilt latches to be installed vertically within the stiles, reducing wind load stress and maintaining a slim check rail profile by concealing the tilt latch mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple tilt latches are installed vertically within stiles to reduce wind load stress, then the structural strength is improved, but the device complexity increases
Solution Approach 1:
The tilt latch mechanism is divided into separate functional components: a latch member for engagement, a slide member for actuation, and a spring for biasing. This segmentation allows each component to be optimized independently and simplifies the overall assembly while maintaining strength.
Solution Approach 2:
The tilt latch assemblies are nested within the stile structure, with the latch member fitting into a recess in the window casing. This nesting conceals the mechanism within the existing frame geometry, avoiding additional external complexity while providing multiple engagement points for wind load resistance.
2Shape
If tilt latch mechanism is concealed within stiles to maintain slim check rail profile, then the aesthetic appearance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The latch member is designed with a localized engagement feature that fits into a corresponding recess in the window casing. This local quality approach allows precise engagement at the critical interface while maintaining a slim overall profile. The recess provides a defined location that simplifies positioning and reduces manufacturing tolerance requirements.
3Ease of operation
If sash lock hardware is mounted at the end of check rail to enable operation, then the ease of operation is improved, but the check rail profile height increases
Solution Approach 1:
The sash lock mechanism is repositioned from a vertical arrangement (end of check rail) to a horizontal arrangement (mounted to the rail, operating latches in the stile). This dimensional change allows the lock to be operated at a convenient location while maintaining a slim check rail profile height.
Data Source
AI summary
A window assembly is disclosed including a window casing; a sash assembly slidably mounted within the window casing, the sash assembly including first and second stiles extending between first and second rails; a first tilt latch assembly mounted in the first stile; a second tilt latch assembly mounted in the second stile; and a sash lock mounted to the first rail, the sash lock being operably connected to the first and second tilt latch assemblies to operate the first and second tilt latch assemblies between a latched position in which a latch member of each of the first and second tilt latch assemblies engages with the window casing assembly and an unlatched position in which the latch member of each of the first and second tilt latch assemblies is disengaged with the window casing assembly.