Casement Pivot Arm Roller Hinge Friction Reduction
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Solution Overview
Problem
Existing fenestration hardware for casement windows, particularly larger and heavier ones, faces challenges in easy opening and closing due to lack of efficient support and lubrication, leading to increased friction and potential damage during transport and storage.
Innovation Solution
A casement window lower roller hinge system featuring a track with an engagement portion, a housing with a roller and guide portion, and a removable shipping spacer that supports the sash during transport and storage, allowing the roller to roll along the track for easy movement and minimizing friction through controlled contact surfaces and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hinges are used for larger, heavier casement windows, then the window can be supported during transport and storage, but opening and closing becomes difficult due to increased friction and lack of efficient support
Solution Approach 1:
The patent replaces traditional sliding friction-based hinge mechanics with a roller-based system. The roller element introduces rolling friction instead of sliding friction, dramatically reducing the force needed to move the heavy sash during operation while maintaining support capability during transport and storage.
Solution Approach 2:
The patent changes the friction parameter from high (sliding) to low (rolling) by introducing the roller mechanism. This parameter change allows the same hinge structure to handle heavier sashes with reduced operational force requirements, directly addressing the contradiction between weight and ease of operation.
2Ease of operation
If the roller is continuously engaged with the track, then easy opening and closing is achieved, but the roller and track experience increased wear during transport and storage
Solution Approach 1:
The hinge design allows the roller to dynamically transition between engaged and disengaged states. During operation, the roller engages with the track for smooth movement. During transport and storage, the roller can be disengaged or positioned to minimize contact, reducing wear while maintaining operational smoothness when needed.
3Reliability
If the roller is positioned to contact the track at all positions, then continuous support is provided during operation, but friction increases during transport and storage
Solution Approach 1:
The hinge system segments the support function into operational mode and transport mode. The roller mechanism can be selectively engaged during operation to provide continuous support and minimize friction, then disengaged or repositioned during transport to eliminate unnecessary contact and friction, addressing both reliability and ease of operation concerns.
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
Facilitates easy opening and closing of larger, heavier casement windows by reducing friction and supporting the sash during transport and storage, preventing damage and ensuring smooth operation.
Implementation Method 1
a roller positioned to roll along the track for repositioning of the sash arm
Implementation Method 2
Facilitates easy opening and closing of larger, heavier casement windows by reducing friction
Implementation Method 3
a guide slidably engaged with the engagement portion of the track
Implementation Method 4
a removable shipping spacer fits under the lower hinge and helps to support the weight of the sash during transport and storage
Data Source
AI summary
A casement window includes a lower hinge that has an oil-impregnated roller to facilitate easy opening and closing of the window, particularly with larger, heavier casement windows. In some instances, the lower hinge includes a housing having a roller portion and a guide portion. A roller can be disposed within the roller portion and a guide can be snap fitted into the guide portion. In some cases, a removable shipping spacer fits under the lower hinge and helps to support the weight of the sash during transport and storage.