Friction Adjuster for Window Balance Carrier Fit
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Solution Overview
Problem
Window balance carriers often fit too loosely within their channels, leading to operational issues and interference with carrier/window functionality.
Innovation Solution
A friction adjuster system with a carrier interface and a mating helical gear step configuration that allows for adjustable frictional contact between the carrier and the window frame channel, enabling better fitting and retention through a manipulation interface, such as a screwdriver, and break-away connections for easy detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the carrier fits snugly within the channel, then alignment and sliding operation are maintained, but manufacturing tolerance variations cause loose fits that lead to twisting and binding
Solution Approach 1:
The friction adjuster changes the physical parameter of friction between the carrier and channel by rotating the adjuster mechanism. This increases or decreases the frictional force to compensate for manufacturing tolerance variations, ensuring reliable alignment and operation regardless of fit precision variations.
Solution Approach 2:
The friction adjuster transforms a static fit relationship into a dynamic, adjustable one. The carrier-channel interface can be modified in real-time through rotation of the friction adjuster, allowing the system to adapt to manufacturing variations and maintain proper alignment during operation.
2Reliability
If locking members are forced tightly against channel walls during pivoting, then frictional grip is created to prevent carrier movement, but this creates excessive friction that interferes with normal carrier operation
Solution Approach 1:
The friction adjuster enables dynamic control of the friction level between carrier and channel. During normal operation, low friction allows smooth sliding. During pivoting, the friction can be increased to provide necessary stability, creating a dynamic system that adapts to different operational states.
Solution Approach 2:
The system changes the friction parameter based on operational requirements. The friction adjuster mechanism allows the friction coefficient to be varied, providing low friction for smooth operation and high friction for stable locking during pivoting events.
3Stability of the object's composition
If the carrier is designed with a rectangular cross-section for snug fit, then proper alignment is maintained, but this design does not accommodate variations in manufacturing tolerance
Solution Approach 1:
The friction adjuster adds a dynamic adjustment capability to the otherwise static rectangular carrier design. This allows the system to maintain its simple geometric stability while adapting to manufacturing variations through adjustable friction control.
Solution Approach 2:
The friction adjuster mechanism allows the carrier system to self-adjust to manufacturing tolerance variations without requiring complex redesign of the carrier geometry itself. The adjustable friction compensates for fit issues, making the system self-correcting.
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 friction adjuster system effectively adjusts the carrier's fit within the channel, enhancing the operational stability and alignment of window balance carriers by increasing frictional contact, thus addressing the issue of loose fits and improving overall window operation.
Implementation Method 1
forces a rear portion of the friction adjuster into greater frictional contact with a portion of a window frame channel
Data Source
AI summary
A carrier for a window sash having an actuatable friction adjuster. The friction adjuster has a carrier interface that interacts with a mating friction adjuster interface of the carrier such that the actuation of the friction adjuster by rotating it within an oblong slot in the carrier causes the carrier interface to interact with the friction adjuster interface and forces a rear portion of the friction adjuster into progressively increasing frictional contact with an adjacent portion of a window frame sash channel.