Window treatment hembar

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Solution Overview

Problem

Conventional window treatment hembars have a height greater than their depth, which can lead to inefficiencies in securing and managing flexible materials, particularly when the treatment is in a raised position, as they do not effectively fit within the space defined by the roller tube and the bottom plane of the window treatment system.

Innovation Solution

A hembar design with a depth greater than its height, featuring a slot configuration and a compressible member like a rubber spline, allows the hembar to fit into a space below the flexible material wrapped around the roller tube, with adjustable slot widths and a center of gravity aligned with the slot, ensuring secure clamping and balanced weight distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a typical hembar has a height greater than its depth to adequately secure the shade fabric, then the shade fabric can be securely attached, but the hembar does not fit within the space below the flexible material when the treatment is in the raised position

Engineering Contradiction:

Improvesecure attachment of shade fabricVSAvoidhembar dimensions (height vs depth)

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The patent inverts the conventional hembar dimension ratio by making the depth greater than the height, rather than height greater than depth. This inversion allows the hembar to fit within the limited space below the flexible material when raised, while still providing adequate securement capability through the front wall's engagement surface

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent applies local quality by concentrating the securement function in the front wall portion of the hembar, which provides a substantial engagement surface for the shade fabric. The depth portion of the hembar is minimized for space efficiency, while the front wall maintains sufficient height for reliable attachment

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If the hembar depth is minimized to save on manufacturing and material costs, then manufacturing efficiency improves, but the hembar may not adequately secure the shade fabric

Engineering Contradiction:

Improvemanufacturing cost efficiencyVSAvoidshade fabric securement

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent concentrates the securement function in the front wall portion of the hembar, which provides a substantial engagement surface for the shade fabric. The depth portion of the hembar is minimized for space efficiency and cost reduction, while the front wall maintains sufficient height for reliable attachment

Inventive Principle:

Principle #3Local quality

3Shape

If the hembar is designed to fit within the space below the flexible material when raised, then the hembar remains hidden when the treatment is in the raised position, but the securement capability may be compromised

Engineering Contradiction:

Improvehembar profile for hidden positioningVSAvoidflexible material clamping

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The patent inverts the conventional hembar dimension ratio by making the depth greater than the height, allowing the hembar to fit within the limited space below the flexible material when raised, while still providing adequate securement capability through the front wall's engagement surface

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

Inventive Principle:

Principle #3Local quality

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

This design enables the hembar to securely clamp the flexible material within the slot, minimizing wrinkling and ensuring smooth operation of the window treatment system, while allowing the hembar to be hidden when the treatment is in a raised position, maintaining a level hanging orientation.

Implementation Method 1

The rubber spline may be configured to exert a force on the first piece and the second piece such that the flexible material is clamped within the slot

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12104437B2Window treatment hembar

Publication Date: 2024.10.01 LUTRON TECHNOLOGY COMPANY LLC

AI summary

A hembar may define a front portion and a rear portion configured to slidably engage each other. The front portion and the rear portion, when slidably engaged, may define a slot configured to receive a piece of fabric. The front portion and the rear portion may be configured to clamp the piece of fabric within the slot. The front portion and the rear portion may be configured such that a width of the slot is adjustable. The front portion may define a first attachment surface and the rear portion may define a second attachment surface. The first attachment surface may define a rib. The second attachment surface may define a groove configured to receive the rib when the front portion is slidably engaged with the rear portion such that the piece of fabric is clamped within the slot.