Rotatable Rivet Assembly for Adjustable Window Lock Seal
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Solution Overview
Problem
Existing casement and awning window lock systems face challenges in achieving a precise seal between the window sash and frame due to variations in manufacturing and installation, leading to unsatisfactory engagement of rivets with keepers.
Innovation Solution
A rotatable rivet assembly with a cylindrical sleeve and shank, where the shank is offset from the sleeve's center axis, allowing for adjustable engagement with the keeper to enhance or reduce the seal between the sash and frame, utilizing a matching cross-sectional shape for secure assembly and tool-accessible head for easy adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed rivet assembly is used in the lock system, then the structure is simple and easy to manufacture, but the seal between the frame and sash is insufficient due to manufacturing and installation variations
Solution Approach 1:
The rivet assembly is made rotatable within the tie bar, transforming from a fixed static structure to a dynamic adjustable one. This allows the engagement position between the rivet and keeper to be modified, compensating for manufacturing and installation variations to achieve proper seal contact.
Solution Approach 2:
The engagement parameter (position of rivet relative to keeper) is made changeable through rotation of the rivet assembly. By altering the angular position, the linear engagement distance between rivet and keeper changes, enabling adjustment of seal pressure and contact quality.
2Manufacturing precision
If the rivet assembly is made adjustable to improve seal quality, then the seal between frame and sash improves, but the device complexity increases
Solution Approach 1:
The rivet assembly incorporates rotational capability within the tie bar, allowing adjustment of engagement precision without requiring complex external adjustment mechanisms. The dynamic element enables precise positioning through simple rotation.
Solution Approach 2:
The rotatable rivet assembly serves multiple functions: it provides the locking engagement, allows for adjustment of seal pressure, and compensates for manufacturing tolerances. This multi-functionality reduces the need for separate adjustment components.
3Reliability
If prior adjustable lock systems are used, then some adjustability is provided, but they do not achieve satisfactory seal quality and the adjustment mechanism is insufficient
Solution Approach 1:
The rivet assembly is designed to rotate freely within the tie bar to a positioned stop, providing continuous adjustability rather than discrete positions. This dynamic rotation capability allows fine-tuning of the seal engagement.
Solution Approach 2:
The system allows continuous variation of the engagement parameter by rotating the rivet assembly to different angular positions, enabling precise adjustment of seal contact pressure and position, unlike fixed or coarsely adjusted systems.
Data Source
AI summary
A lock system for casement or awning windows. The lock system includes a keeper and a tie bar with a rivet assembly rotatably attached thereto. The rivet assembly includes a rivet and a sleeve rotationally fixed to the rivet, the rivet and the sleeve having longitudinal axes parallel to but offset from each other.