Rolling Shutter Base Slat Retention via Hidden Limit Switch

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Solution Overview

Problem

Motor-driven rolling shutter assemblies face challenges in properly deploying the shutter curtain due to the base slat remaining in the side tracks, leading to potential damage and inefficient retraction into the housing, as existing solutions either risk damaging the motor or fail to ensure accurate stopping mechanisms.

Innovation Solution

The implementation of improved shutter tracks with a hidden stopping mechanism that includes a limit switch and trigger mechanism within the shutter housing, allowing the base slat to be recessed without compromising the unrolling functionality, using a guide arm and adjustable throw member to actuate the limit switch when the base slat reaches a predetermined position.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the base slat remains in the side tracks to lead slats back into position during unrolling, then proper deployment of the shutter curtain is ensured, but the base slat cannot fully retract into the housing reducing opening size

Engineering Contradiction:

Improveshutter deploymentVSAvoidretraction space

Core Design Contradiction:

Ease of operationVSVolume of moving object

Solution Approach 1:

The side tracks are segmented into two functional zones: a lower portion that guides the base slat during deployment, and an upper portion that extends into the housing to receive and retain the base slat during retraction. This segmentation allows the base slat to be retained in the upper portion while other slats roll up onto the support member.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The side tracks extend upwardly into the shutter housing, utilizing the vertical dimension within the housing space. This allows the base slat to be retained in three-dimensional space within the housing volume, freeing up external space while maintaining deployment functionality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If a limit switch is added to detect base slat position and shut off the motor, then accurate stopping is achieved, but the device complexity increases

Engineering Contradiction:

Improvebase slat position detectionVSAvoidcontrol mechanism

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The upwardly extending side tracks serve dual functions: they physically guide and retain the base slat during operation, and they provide the structural framework for mounting the limit switch. The system uses its own structural components rather than adding separate dedicated mounting elements.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The limit switch mechanism is integrated with the side track structure and the base slat's guide arms. The guide arms that engage the upwardly extending tracks also serve to actuate the limit switch, combining positioning and detection functions into a single integrated mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8746321B2Base slat retention and motor triggering for rolling protective shutters

Publication Date: 2014.06.10 QUALITAS MFG INC

AI summary

The present invention is directed to a rolling protective shutter having an improved stopping mechanism that prevents the shutter from completely rolling up onto the shutter support member, and that is hidden within the shutter housing or the side tracks. The stopping mechanism may include a limit switch operatively connected to a drive motor to detect a disposition of the base slat of the shutter curtain proximate the shutter housing. The limit switch may actuate to turn off the drive motor at an appropriate position to retain the base slat within the side tracks and to prevent damage to the shutter housing due to engagement by the base slat.