Window Operator With Multi-Point Locking and Rack-and-Pinion Actuation
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Solution Overview
Problem
Casement window operators require excessive force to open, leading to user difficulty and mechanical wear, and lack a secure locking mechanism to prevent accidental use.
Innovation Solution
A window operator with a locking mechanism featuring a multi-point tie bar or blade system, integrated with a rack and pinion gear arrangement, which must be unlocked before use, and a compact design suitable for various arm configurations, including single, split, and dual arm arrangements, ensuring secure operation and reduced force requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single arm operator is used, then the device complexity is reduced, but excessive force is required to open the window
Solution Approach 1:
The operator arm is divided into multiple segments (first arm portion, second arm portion, third arm portion) connected by pivot points. This segmentation allows the operator to function as either a single-arm or dual-arm configuration, providing flexibility to reduce opening force while managing device complexity.
2Force
If a dual arm operator is used, then the force to open the window is reduced, but the device complexity increases
Solution Approach 1:
The operator is designed with universal mounting capabilities that allow it to function in multiple configurations (single-arm or dual-arm) depending on the window application. The same basic operator structure can serve different force requirements through adjustable mounting positions and optional second arm portions.
3Reliability
If a locking mechanism is added, then window security is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is merged with the operator housing, integrating the lock into the existing operator structure. This combination provides window security while minimizing additional complexity by utilizing the operator's existing components and space.
4Ease of manufacture
If the operator is integrated into pre-designed openings, then the ease of installation is improved, but the device flexibility is reduced
Solution Approach 1:
The operator incorporates dynamic adjustment capabilities through pivot points and adjustable mounting positions. This allows the operator to adapt to different window configurations and opening types (casement, awning, sliding) while still fitting within pre-designed openings, maintaining both ease of installation and configuration flexibility.
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 locking mechanism prevents accidental window opening, reduces the force needed to operate the window, and provides a secure, compact design that fits within pre-designed openings, enhancing user safety and mechanical longevity.
Implementation Method 1
an actuator connected to a rack and pinion gear arrangement to move the multi-point tie bar between open and locked positions
Implementation Method 2
The window operator typically will utilize a hand crank which is rotatable and which in turn drives a worm gear. The worm gear in turn will drive gearing which is connected to the arm which pushes the window sash open.
Data Source
AI summary
An operator for a window comprising a base designed to be secured to a window sash, an arm having first and second ends with the first end being secured to the base and a first end of the arm having a worm wheel formed thereon, a shaft having a worm operatively connected to the worm wheel, a handle secured to the shaft, a locking mechanism comprising a multipoint tie bar, and an actuator connected to a rack and pinion gear arrangement to move the multipoint tie bar between open and locked positions. The arrangement provides for a compact efficient design which includes a locking mechanism and an opening mechanism located at the same point.