Integrated Casement Window Operator Anti-Backdrive Mechanism
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Solution Overview
Problem
Casement windows face challenges with complex and costly operators and separate locking systems, which can be prone to back-driving and detract from aesthetic appearance, limiting their use in low-cost construction.
Innovation Solution
An integrated casement window operator and lock featuring a gear mechanism with a pinion gear, arm assembly, and anti-backdrive pin assemblies that inhibit backdriving, allowing for secure locking and operation in a single device, with a handle that rotates to shift the arm between fully closed and open positions, utilizing biasing springs to engage anti-backdrive pins in notches for enhanced security and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex operator and separate locking system are used, then security and operation functionality are improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the operator mechanism and locking system into a single integrated device. The operator body serves dual functions: it operates the casement window sash and simultaneously provides locking capability through integrated locking points and engagement features. This eliminates the need for separate locking systems while maintaining both operational and security functions.
Solution Approach 2:
The operator device is designed to perform multiple functions: it provides window operation through the arm and linkage mechanism, security through integrated locking points, and aesthetic coverage through the operator body housing. This multi-functional design reduces the total number of components needed while enhancing overall system capability.
2Device complexity
If a simple integrated operator is used, then device complexity and cost are reduced, but susceptibility to back-driving increases
Solution Approach 1:
The patent incorporates anti-backdrive features directly into the integrated operator design. The mechanism includes one-way engagement features and friction elements that prevent reverse operation (back-driving) of the window sash. This preliminary anti-action is built into the structure, allowing the simple integrated design to maintain security against unauthorized reverse operation.
3Reliability
If a hook arrangement for securing locking points is used, then locking functionality is provided, but aesthetic appearance deteriorates
Solution Approach 1:
The patent nests the locking points and engagement features within the operator body housing. The locking mechanism is concealed inside the decorative operator body, which serves as a cosmetic cover. This nesting arrangement allows the locking functionality to be hidden from view, maintaining aesthetic appearance while providing secure locking capability through the integrated points.
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 simple, cost-effective integration of operation and locking functions, preventing unauthorized access and wind-induced backdriving, while maintaining aesthetic appeal by eliminating the need for separate locking systems and reducing friction, thus enhancing the usability and security of casement windows.
Implementation Method 1
a gear mechanism, the gear mechanism including a housing, a pinion gear rotatably mounted to the housing, and an arm assembly
Implementation Method 2
The arm defines a rack portion and an adjacent arcuate gear portion, and the arm is slidably and rotatably mounted to the housing with the pinion gear engaged with the rack portion and the arcuate gear portion
Implementation Method 3
utilizing biasing springs to engage anti-backdrive pins in notches for enhanced security and functionality
Data Source
AI summary
An integrated casement window operator and lock, including a gear mechanism and an arm assembly, the arm defining a rack portion and an adjacent arcuate gear portion, the arm mounted to the housing with a pinion gear engaged with the rack portion and the arcuate gear portion, the pinion gear defining a star-shaped aperture therethrough and a handle with a square-shaped shaft portion received in the star-shaped aperture of the gear. The handle is selectively rotatable to shift the arm between a window fully closed position and a window fully open position, wherein an anti-backdrive mechanism is provided to inhibit backdriving of the arm in both the window fully closed window fully open positions.