Tilt-in Window Balance Carrier Cam Mechanism
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Solution Overview
Problem
Existing window counterbalance systems for tilt-in windows face challenges in reducing operating forces and preventing damage or wear due to cocking or rotating of the carrier assembly in the jamb channel, which affects the efficiency and longevity of the system.
Innovation Solution
A window balance assembly comprising a bracket, a spring, and a carrier assembly with a cam mechanism that allows for vertical drop-in installation of the pivot bar, featuring a lock that engages the jamb channel to restrict movement, reducing cocking and rotating, and a coil spring providing upward counterbalance force to assist in opening and closing the window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the carrier assembly is allowed to move freely in the jamb channel, then the window sash can be opened and closed, but the carrier assembly will cock or rotate causing damage or wear
Solution Approach 1:
The patent introduces a cam mechanism as an intermediary element between the carrier assembly and the jamb channel. The cam engages with slots in both components, acting as a mediator that guides the carrier assembly's movement while preventing unwanted cocking or rotation. This intermediary mechanism allows the window to open and close smoothly while maintaining carrier assembly stability.
2Strength
If traditional counterbalance systems are used, then the window sash can be supported, but the operating forces are high causing user fatigue
Solution Approach 1:
The patent employs a dynamic cam mechanism that adjusts its engagement with the carrier assembly and jamb channel during window operation. As the window sash moves, the cam rotates and changes its contact points, dynamically optimizing the force distribution. This dynamic adjustment reduces the operating force required by the user while maintaining adequate counterbalance support throughout the entire range of motion.
Solution Approach 2:
The cam mechanism changes geometric parameters during operation - specifically the angle and position of contact between the cam and the slots. By varying these parameters as the window opens and closes, the system optimizes mechanical advantage at different positions, reducing peak operating forces while maintaining support capability.
3Adaptability or versatility
If the pivot bar is installed horizontally, then the window can be tilted, but the carrier assembly cannot be installed vertically via drop-in method
Solution Approach 1:
The patent introduces a vertical dimension to the pivot bar installation by incorporating a cam mechanism that enables vertical drop-in installation. The cam's rotational movement adds a dimensional transformation, allowing the pivot bar to be inserted vertically while still maintaining the horizontal tilting function. This dimensional change simplifies installation while preserving adaptability.
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 operating forces by 30-40% and minimizes damage or wear by preventing cocking or rotating of the carrier assembly, enhancing the efficiency and durability of the window counterbalance system.
Implementation Method 1
a coil spring providing upward counterbalance force to assist in opening and closing the window
Data Source
AI summary
A window balance assembly for a tilt-in window comprising a bracket, a spring and a carrier. The first spring has a first portion engaging the bracket. The carrier has a vertical portion including a first slot, a first projection extending outwardly from a first side of the vertical portion, and a second attachment projection extending outwardly from a second side of the vertical portion. The first slot receives a pivot bar of the tilt-in window via a vertical drop-in installation. One of the first and second attachment protrusions engages the first portion of the spring. The horizontal portion includes an aperture rotatably engaging a cam between a first position and a second position. The cam has a second slot aligned with the first slot when the cam is in the first position allowing for the pivot bar to move between the first slot and the second slot.