Screen Device Counterweight Mechanism for Sliding Speed Control
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Solution Overview
Problem
The existing screen device requires excessive operating force to close due to the coil spring's elastic restoring force, leading to a heavy and potentially unsafe sliding mechanism, especially when tension is increased to prevent screen bending from wind pressure.
Innovation Solution
Incorporating a weight that moves in a height direction interlocking with the development and reception of slide guide frames, utilizing potential energy to brake reception and promote development, thereby reducing the sliding speed and operating force during opening and closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil spring's elastic restoring force is increased to prevent screen bending from wind pressure, then the screen stability is improved, but the operating force required to close the screen becomes excessively large
Solution Approach 1:
A weight is suspended from the slide bar via a rope, creating a counterbalancing force that offsets the elastic restoring force of the coil spring. This counterweight mechanism reduces the net operating force required to move the slide bar while maintaining the screen's stability against wind pressure through the spring's tension.
Solution Approach 2:
The system transitions from a static spring force to a dynamic balance between the spring's elastic restoring force and the weight's gravitational force. The weight moves vertically as the slide bar moves horizontally, creating a dynamic counterbalancing effect that adapts to the screen's position and maintains optimal operating force throughout the range of motion.
2Ease of operation
If the coil spring continuously pulls the slide bar toward the stationary frame, then the screen automatically opens, but the sliding speed becomes excessively high creating safety threats
Solution Approach 1:
The suspended weight creates a counterbalancing gravitational force that opposes the coil spring's elastic restoring force during the opening motion. This counterforce acts as a brake, controlling the acceleration and limiting the maximum sliding speed of the slide bar, thereby eliminating safety threats while preserving automatic opening functionality.
Solution Approach 2:
The weight is positioned and tensioned in advance to provide a preliminary counteracting force against the spring's restoring force. This pre-established counterbalance prevents excessive acceleration from occurring, proactively controlling the sliding speed before safety issues can arise.
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 decreases the sliding speed of the slide bar during opening, enhancing safety, and reduces the operating force required during closing, making the operation feel more nimble and efficient.
Implementation Method 1
the roller pipe receiving therein a coil spring, the roller pipe being rotatable and slidable in the sliding direction of the slide bar, to accumulate an elastic restoring force in the coil spring
Implementation Method 2
a weight is provided to move in a height direction interlocking with development and reception of the slide guide frames, the weight, at the time of opening the screen device, braking reception of the slide guide frames owing to an increase in potential energy
Data Source
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AI summary
A weight moving in a height direction interlocking with development and reception of a slide guide frame is provided, and the weight brakes reception of the slide guide frame owing to an increase in potential energy and promotes development of the slide guide frame owing to a decrease in potential energy, whereby an operating force is decreased, a feeling of operating a slide bar is made light, and the slide bar is decreased in sliding speed at the time of closing to achieve an improvement in safety.