Rod Linkage Resetting Mechanism for Double-Leaf Swing Doors
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Solution Overview
Problem
Existing drive devices for double-leaf swing doors have complex linkage systems that require significant space and are costly to manufacture and assemble, with a resetting device that is particularly complex and prone to errors.
Innovation Solution
A linkage system with a resetting device featuring a spring device between two stops, where the spring device prestresses the rod to facilitate the return movement and reduce the need for a separate restoring device, using a spiral spring for cost-effectiveness and simplicity, and a design that minimizes space requirements and assembly errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex resetting device is used to pull the rod back into the starting position, then the linkage system can achieve the required function, but the space required and manufacturing cost increase significantly
Solution Approach 1:
The patent extracts the resetting function from a separate complex resetting device and integrates it into the rod itself through the expanding mandrel mechanism. The rod is designed with an expanding mandrel at its end that can engage with and disengage from the braking device, allowing the rod to reset itself without requiring an additional resetting device. This extraction of the resetting function from a separate component resolves the technical contradiction by maintaining reliability while reducing device complexity.
Solution Approach 2:
The linkage system is designed to be self-resetting through the expanding mandrel mechanism. When the door reaches the closed position, the carriage movement causes the mandrel to expand and engage with the braking device. After the braking function is completed, the mandrel automatically retracts and disengages, allowing the rod to return to its starting position without external assistance. This self-service mechanism eliminates the need for a separate resetting device, resolving the contradiction between functionality and complexity.
2Reliability
If a complex resetting device is used to pull the rod back into the starting position, then the linkage system can achieve the required function, but the installation space required increases
Solution Approach 1:
The patent merges the resetting function with the rod structure itself by integrating the expanding mandrel mechanism into the rod. The mandrel is positioned at the end of the rod and uses the rod's own movement and the carriage movement to achieve engagement and disengagement with the braking device. This merging of functions eliminates the need for a separate resetting device, thereby reducing the installation space required while maintaining the linkage system's functionality.
Solution Approach 2:
The expanding mandrel is nested within the rod structure, allowing it to expand and contract as needed. When the mandrel expands, it engages with the braking device; when it contracts, it disengages and allows the rod to return to its starting position. This nested design enables the resetting function to be contained within the existing rod structure without requiring additional external space, resolving the contradiction between functionality and installation space.
3Reliability
If a separate restoring device is used to pull out the expanding mandrel and activate the braking device, then the braking function can be achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the restoring function from a separate restoring device and integrates it into the rod and expanding mandrel mechanism. The mandrel is designed to expand and contract based on the carriage movement and door position, allowing it to engage and disengage from the braking device without requiring an external restoring mechanism. This extraction of the restoring function reduces manufacturing complexity and cost while maintaining reliable braking device activation.
Solution Approach 2:
The expanding mandrel mechanism is designed to be self-activating through the carriage movement and door position. As the door moves, the carriage moves accordingly, which causes the mandrel to expand and engage with the braking device. After the braking function is completed, the mandrel automatically retracts and disengages. This self-service mechanism eliminates the need for a separate restoring device, reducing manufacturing cost while ensuring reliable braking activation.
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 significantly reduces installation space, simplifies assembly, and reduces manufacturing costs by using a spiral spring to transmit force efficiently, while ensuring accurate power transmission and maintaining the desired preload force.
Implementation Method 1
a spring device (50) extends between the two stops (30, 40). The spring device (50) applies a force to the rod (12) in a first direction via the force transmission section (42)
Implementation Method 2
using a spiral spring for cost-effectiveness and simplicity
Data Source
Figure 1a~1c
Figure 2~3
Figure 4
AI summary
The invention relates to a linkage system (10) of a drive device (100) of a double-leaf swing door (200) with a return device (20), comprising a first stop (30) and a second stop (40), between which a spring device (50) extends, wherein the first stop (30) has a fastening section (32) for attachment to the drive device (100) against a translational movement, and the second stop (40) has a force transmission section (42) for force transmission for the translational movement of a rod (12, 14) of the linkage system (10), wherein the spring device (50) applies a force to the rod (12, 14) in a first direction via the force transmission section (42), wherein the rod (12, 14) extends at least section by section through the spring device (50), the first stop (30) and the second stop (40).