Coil Spring Counterbalance for Side Loading Window Sashes
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Solution Overview
Problem
Existing counterbalance systems for side loading window sashes are complex, expensive, and difficult to manufacture, requiring custom designs for different sizes and weights, with limited reliability and safety concerns due to intricate assembly and detachment processes.
Innovation Solution
A counterbalance system utilizing a spring carriage with coil springs anchored to the window frame, which fits into the gap between the sash and frame, providing a versatile and simple-to-manufacture solution that allows for easy attachment and detachment, enabling the sash to be removed without inhibiting its operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If block and tackle counterbalance systems are used for removable sashes, then the sash can be detached from the frame, but the system becomes complex with multiple moving parts that are difficult to assemble and prone to failure
Solution Approach 1:
The patent extracts the coil spring from its traditional fixed attachment to the sash and relocates it to attach only to the window frame. The spring carriage, which can be detached, replaces the direct sash attachment. This separation allows the sash to be removed without removing the counterbalance system, solving the complexity problem while maintaining removability.
Solution Approach 2:
The spring carriage acts as an intermediary component between the coil spring and the sash. It provides a simple attachment point for the sash while being easily detachable, eliminating the need for complex block and tackle mechanisms. The intermediary simplifies the connection while enabling the desired functionality.
2Adaptability or versatility
If custom block and tackle counterbalance assemblies are designed for different sash heights and weights, then each specific window configuration can be accommodated, but manufacturing costs increase and assembly becomes more difficult
Solution Approach 1:
The patent creates a universal counterbalance system where the same coil spring and spring carriage assembly can be used across different window configurations. The adaptability to different sash weights and heights is achieved through adjustment of spring tension and carriage position rather than custom-designed assemblies, greatly simplifying manufacturing.
Solution Approach 2:
Instead of designing different physical assemblies for different sashes, the system adjusts parameters such as spring tension, spring coil count, and carriage attachment points to accommodate varying sash weights and heights. This parameter-based adaptation maintains manufacturing simplicity while achieving versatility.
3Ease of operation
If coil springs are directly attached to the end of the sash that remains on the frame, then tilting for cleaning is enabled, but complete removal of the sash from the frame becomes impossible
Solution Approach 1:
The system segments the counterbalance attachment into two independent parts: the coil spring attached to the frame and the spring carriage that can be detached from the sash. This segmentation allows the sash to be completely removed while the counterbalance system remains on the frame, enabling both tilt-for-cleaning and complete removal capabilities.
4Adaptability or versatility
If manual detachment of clips is required to remove the sash from block and tackle systems, then the sash can be removed, but the process is difficult and poses safety risks to inexperienced users
Solution Approach 1:
The spring carriage is designed to be easily detachable from the sash without requiring complex manual operations. The simple attachment mechanism allows users to easily remove and reattach the carriage, making the process self-service friendly and eliminating safety risks associated with complex clip detachment procedures.
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 system effectively counterbalances window sashes of varying sizes and weights, ensuring reliability and safety by using a single, adaptable design that simplifies assembly and detachment, reducing manufacturing costs and enhancing user safety.
Implementation Method 1
Counterbalancing a window sash with a coil spring is a fairly simple matter
Implementation Method 2
One end of the coil spring is attached to the window frame while the body of the coil spring is engaged by the sash
Data Source
AI summary
A counterbalance system for a side load window assembly having a window sash and side frame jambs. A spring carriage is provided. The spring carriage has a first section that fits into a gap space between the window frame and the window sash. The spring carriage also includes a second section that passes under the window sash, therein supporting the window sash. At least one coil spring is provided. Each coil spring has a wound body that is held within the spring carriage. Each coil spring also has a first end that extends out of a housing and is anchored to one of the side frame jambs. The coil springs bias the spring housing upwardly. Since the window sash rests upon the housing, the window sash is counterbalanced.