Casement Window Operator Linear Input Mechanism
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Solution Overview
Problem
Existing casement window operators with rotary input mechanisms, such as crank handles, require higher operational forces and do not offer secure braking options for intermediate positions, limiting user convenience and energy efficiency.
Innovation Solution
A casement window operator with a linear input mechanism, including a sliding handle and a gear reducer system, which converts linear motion into rotary motion to operate the sash arm, and an integrated brake mechanism to secure the window at various positions, reducing operational force and enhancing user control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rotary input mechanism (crank handle) is used, then the window can be operated, but higher operational forces are required
Solution Approach 1:
The patent replaces the traditional rotary crank mechanism with a linear sliding mechanism that incorporates a rack and pinion system. The linear input mechanism converts straightforward sliding motion into rotational motion of the sash arm, reducing the operational force required compared to conventional rotary cranks while maintaining mechanical simplicity through the use of standard gear components.
Solution Approach 2:
The patent introduces a dynamic brake mechanism that can engage at multiple positions along the linear track, allowing the window to be held securely at intermediate positions. This dynamic braking capability provides user convenience by enabling the window to be stopped and held at various points during operation, rather than requiring continuous motion or fixed-position locking only.
2Ease of operation
If a rotary input mechanism is used, then the window can be operated, but secure braking options for intermediate positions are not available
Solution Approach 1:
The patent implements a dynamic brake mechanism that can engage at multiple positions along the linear track. The brake is actuated by the sliding mechanism itself and can provide secure holding positions at various points during window operation, enabling intermediate positioning without requiring a complex multi-component brake system.
Solution Approach 2:
The brake mechanism is integrated into the linear sliding mechanism itself, combining the input mechanism and braking function into a unified system. The sliding action that operates the window also actuates the brake, eliminating the need for separate, independent brake components and reducing overall device complexity while providing secure intermediate positioning.
3Force
If a linear input mechanism is used, then operational force is reduced, but the mechanism requires precise motion conversion
Solution Approach 1:
The patent uses a rack and pinion mechanism to convert linear sliding motion into rotational motion of the sash arm. This standard mechanical conversion system provides reliable and accurate motion transformation, ensuring that the linear input is precisely translated into the required rotational output for window operation without requiring complex control systems or high-precision manufacturing beyond standard gear tolerances.
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 reduces the operational force required to open and close the window, allows secure braking at intermediate positions, and improves user convenience by enabling easy sliding motion with reduced contact, thus enhancing the overall efficiency and usability of the casement window system.
Implementation Method 1
a linear to rotary motion converter operably coupled to an output of the linear input mechanism
Implementation Method 2
a gear reducer operably coupled to an output of the rotary motion converter
Implementation Method 3
an actuatable brake providing at least one braking position in which the actuatable brake is configured to contact the track and restrict sliding motion of the track mount along the track
Data Source
AI summary
A casement window operator includes a linear input mechanism configured to be mounted to a stationary frame of a casement window, a linear to rotary motion converter operably coupled to an output of the linear input mechanism, a gear reducer operably coupled to an output of the rotary motion converter, and a sash arm operably coupled to an output of the gear reducer to rotate in conjunction with the output of the gear reducer. The sash arm is configured to extend from the stationary frame of the casement window to a rotatable window sash of the casement window.