Draw Bar Brake Arrangement with Force-Increasing Mechanism
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Solution Overview
Problem
Existing draw bar mechanisms for retractable screens often fail to provide sufficient braking force to prevent undesired movement in the retraction direction due to the retraction force applied by the biased roller, especially when attempting to maintain the screen in a partially closed position.
Innovation Solution
A draw bar with a brake arrangement that includes a friction surface and a forcing arrangement with a biasing mechanism and a force-increasing mechanism, where the force-increasing mechanism converts frictional force into additional contact pressure to enhance the engagement between the friction surface and the bearing surface, providing increased braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a brake arrangement with only biasing mechanism is used, then the structure is simple, but the braking force is insufficient to resist retraction force from the biased roller
Solution Approach 1:
A forcing part acts as an intermediary element between the friction surface and the biasing mechanism. This forcing part converts the frictional force generated during braking into additional contact pressure force, thereby amplifying the braking force without requiring a more complex biasing mechanism. The forcing part transmits and transforms forces to achieve enhanced braking performance.
Solution Approach 2:
The system changes the parameter of contact pressure between the friction surface and bearing surface by introducing the force-increasing arrangement. The frictional force is converted into additional contact pressure force, effectively changing the normal force parameter to increase braking capability while maintaining structural simplicity.
2Force
If the friction surface engages the bearing surface with higher force, then the braking force increases, but the ease of operation for moving the draw bar decreases
Solution Approach 1:
The brake arrangement transitions from a static friction-based braking system to a dynamic system where the contact pressure is actively increased through the force-increasing arrangement. The forcing part dynamically converts frictional forces into additional contact pressure, allowing the system to provide high braking force when needed while maintaining ease of operation through controlled engagement.
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 enhanced braking force effectively resists relative movement between the brake arrangement and the bearing surface, allowing the screen to be maintained in a partially closed position without unintended retraction, even under the retraction force from the biased roller.
Implementation Method 1
a brake member which provides a friction surface for contacting the bearing surface
Implementation Method 2
a biasing arrangement for biasing the friction surface towards the bearing surface
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A brake arrangement, for a retractable screen arrangement in which the a screen roller applies a retraction force to the screen and brake arrangement, includes a brake arrangement, for providing a braking force between the brake arrangement and a track which guides the brake arrangement, to resist retraction. The brake arrangement provides a brake member with a friction surface for contacting the bearing surface; a brake member support for supporting the brake member; and a forcing arrangement for forcing the friction surface against the bearing surface. The forcing arrangement includes a biasing arrangement for biasing the friction surface onto the bearing surface, and a force-increasing arrangement for increasing the force with which the friction surface engages the bearing surface. The force increasing arrangement converts a frictional force between the friction surface and the track into additional contact pressure force of the friction surface onto the guide track.