Window Opening Arm Mechanism for Controlled Sash Locking
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Solution Overview
Problem
Existing mechanisms for casement or awning windows and doors lack a controlled manner of opening the hung sash and fail to lock it in a fully open position, making it susceptible to sudden closure due to wind gusts.
Innovation Solution
A mechanism featuring an arm with a slot and a rivet pin that allows controlled opening and locking of the hung sash, utilizing a spheroid joint connection between the arm and pin shaft to maintain the sash in a locked position perpendicular to the frame, preventing wind-induced closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hung sash is made movable to allow opening for airflow, then ventilation is improved, but the risk of sudden closure due to wind gusts increases
Solution Approach 1:
The mechanism performs preliminary action by automatically engaging the locking mechanism when the hung sash reaches the fully open position. The arm's angled section engages with the rivet pin in the fixed element, pre-positioning the lock before wind gusts can cause sudden closure. This preliminary locking action ensures stability is established before environmental forces can act on the open window.
2Reliability
If a locking mechanism is added to prevent sudden closure, then stability in open position is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is merged with the existing arm structure. The arm itself serves as both the actuator for opening the window and the locking component. The angled section of the arm integrates the locking function, eliminating the need for separate locking mechanisms. This merging approach maintains reliability while minimizing added complexity.
Solution Approach 2:
The mechanism is self-serving in that it automatically locks when the hung sash is opened to the fully open position, without requiring additional actuators or complex control systems. The arm's geometry and the engagement between the angled section and rivet pin create a self-activating lock that engages through the natural motion of opening the window.
3Ease of operation
If the arm includes both straight and angled sections, then controlled opening motion is improved, but manufacturing precision requirements increase
Solution Approach 1:
The arm is segmented into distinct functional sections: a straight section for guided linear motion during the opening process, and an angled section for the locking engagement. This segmentation allows each portion to be optimized for its specific function while maintaining overall manufacturability. The slot in the fixed element is correspondingly divided into a linear portion and an angled portion to match the arm's geometry.
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
Enables controlled opening and secure locking of the hung sash, preventing accidental closure due to environmental forces, ensuring stable airflow.
Implementation Method 1
The pin shaft has an enlarged portion that comprises a spheroidal surface that is received in the hole of the arm, and the hole defines a spheroidal inner surface. As such, the pin shaft and the hole cooperate to allow a ball-joint like connection.
Data Source
AI summary
A mechanism for a covering such as an encasement window or door or awning is provided. The mechanism includes an arm, on which a slot is configured. The slot includes a straight section and an angled section. The arm also includes a hole that is offset from the centerline of the straight section and disposed between the angled section and an end of the arm. A pin shaft is disposed in the hole and held in place by a cover member and a movable member, enabling the arm to rotate about the pin shaft. A rivet pin is disposed in the slot and fixedly connected to a fixed member. When the movable member moves, the arm moves such that the hung sash is unlocked from the fixed frame of the covering, and the angled section engages the rivet pin, causing the arm to rotate to open the covering.